南昌大学C程序设计(双语)-作业与答案

南昌大学C程序(双语)-作业与 Chapter 1 Introduction 1、1. Which of the following are illegal identifiers?Circle the illegal identifiers. A.3id B._yes C.star*it D.int 教师批改:A C D 2、1. Which of the following are illegal identifiers?Circle the illegal identifiers. A. xyshouldI B. me_to-2 C. one_i_aren’’t D. 2_i_am 教师批改:B C D Chapter 2 Learning by Example 1、What is correct about the following program? #include #define count 6 void main(void) { count = count + 1 ; printf("%d", count) ; } A. ‘7‘ is output and count becomes 7 B ‘7‘ is output and count becomes 7 C. Runtime Error D. ‘7‘ is output but count remains 6 教师批改:C 2、Indicate which of the following are legal variable names in C: A、X B、formula1 C、average_rainfall D、%correct 教师批改:ABC 3、Indicate which of the following are legal variable names in C: A、short B、tiny C、total rainfall D、aReasonablyLongVariableName 教师批改:BD 4、Indicate which of the following are legal variable names in C: A、12MonthTotal B、marginal-cost C、b4hand D、_stk_depth 教师批改:CD 5、Indicate which of the following are legal variable names in C: A、short B、4formula C、average_rainfall D、%correct 教师批改:C 6、Indicate which of the following are legal variable names in C: A、short B、formula_5 C、average_rainfall D、4correct 教师批改:BC 7、Indicate which of the following are legal variable names in C: A、short B、formula6 C.float D.printf 教师批改:BD 8、"Consider the following code fragment: int dblarray[10],*dblPointer; Which of the following statements are valid (i.e. which ones will compile)? Circle all the correct answers (there may be more than one correct answer)." A. dblPointer = dblArray; B. dblPointer = dblArray[4]; C. dblPointer = &(dblArray[2]); D. dblPointer = *dblArray; 教师批改:AC 9、Indicate the values and types of the following expressions:2+3 value:_______type:_______ 教师批改:5 integer 10、Indicate the values and types of the following expressions:19/5 value:_______ type:_______ 教师批改:3 integer 11、Indicate the values and types of the following expressions:19.0/5 value:_______type:_______ 教师批改:3.8 double 12、Indicate the values and types of the following expressions:3*6.0 value:_______type:_______ 教师批改:18.0 double 13、Indicate the values and types of the following expressions:19%5 value:_______type:______ 教师批改:4 integer 14、Indicate the values and types of the following expressions:2%7 value:_______type:_______ 教师批改:4 integer 15、By applying the appropriate precedence rules,calculate the result of the following expression:6+5/4-3,result is ___________ 教师批改:4 16、By applying the appropriate precedence rules,calculate the result of the following expression:10+9*((8+7)%6)+5*4%3*2+1,result is ___________ 教师批改:42 17、By applying the appropriate precedence rules,calculate the result of the following expression:1+2+(3+4)*((5*6%7*8)-9)-10,result is ___________ 教师批改:42 18、Rewrite the following floating-point constants in C‘s form for scientific notation:29979250000.0_____________ 教师批改:29979250000 19、Rewrite the following floating-point constants in C‘s form for scientific notation:0.00000000529167_____________ 教师批改:0.00000000529 20、Evaluate the following expression: (2 Points) int i=1,j=2,k=3,m=4; i+=j+k; // i=______________ j*=k=m+5; // j=___________ 教师批改:6 18 21、The variables are initialized as follows, char c=‘A‘; int i=7,j=7; double x=0.0,y=2.3; Evaluate the following expressions: (5 Points) !c _______ !(i-j)____________ !i-j______________ !!(x+y)____________ !x*!!y______________ 教师批改:0 1 -7 1 1 22、Indicate the values and types of the following expressions:2%7 value:_______type:_______ 教师批改:2 integer 23、By applying the appropriate precedence rules,calculate the result of the following expression:2+2*(2*2-2)%2/2,result is ___________ 教师批改:2 24、The following C program is compiled and runs successfully. Write the output the following program produces. #include void main( ) { int k = 42; printf(""%d\n"", k++);___________ printf(""%d\n"", ++k);___________ return 0; } 教师批改:42 44 25、Write a program that reads in a list of integers until the user enters the value -1 as a sentinel.At that point,the program should display the average of the values entered so far. Chapter 3 Problem Solving 1、" What is the output of the following code? #include void main(void) { int a ; a = 1; printf(""%i"",++a) ; } " A. Compile-time Error B. 0 C.1 D. 2 教师批改:D 2、Use #define to introduce a constant named pi with the value 3.14159________________ 教师批改:#define pi 3.14159 3、Write a printf statement to display the floating-point value stored in the variable distance so that exactly three digits appear to the right of the decimal point___________________________ 教师批改:printf("%.3f",distance); 4、Use for control line to count from 15 to 25_______________ 教师批改:for(i=15;i<=25;i++) 5、Write a program that displays the message "Hello,world." 10 times on separate lines._______________________________ 教师批改:main(){ int k;for(k=1;k<=10;k++)printf("Hello,world.\n");} 6、Write a program that prints a tabular version of both the squares and cubes of the number from 1 to 10. Chapter 4 Statement Forms 1、Consider the following program: #include void main() { int a=1,b=2,c=3,d=0; if(a==1 && b++==2) if(b!=2||c--!=3) printf(“%d,%d,%d\n”,a,b,c); else printf(“%d,%d,%d\n”,a,b,c); else printf(“%d,%d,%d\n”,a,b,c); } The output of the program is: A)1,2,3 B)1,3,2 C)1,3,3 D)3,2,1 教师批改:C 2、Consider the program fragment and give the output: For (i=0;i<4;i++,i++) for(k=1;k<3;k++); printf(“*”); A)******** B)**** C)** D)* 教师批改:D 3、"Variables i, j, and k are integers where i = 2, j = 3 and k = 5 respectively. Do the following C expressions evaluate to true or false? You answers should be either 1 or 0. a) (i > k) && ((i + j) == k) _______________ b) ((i+j) != k) || (((j*j) > k) && ((i*i) < k)) ____________ c) k < (j < i) _________________ " 教师批改:0 1 0 4、"The following C program is compiled and runs successfully. Write the output that this program produces. #include main() { int x = 4; int y = 4; if ( (x <= y) && (x >= y) ) printf(“Bingo”); else printf(“No go”); } 教师批改:Bingo 5、What will be printed to the screen if we execute the code? #include void main( ) { int index = 0; if(index = 0) printf("A"); if(index = 1) printf("B"); } 教师批改:B 6、What are the values of the following statement,assuming that i,j,and k are declared as integer variables:i=(j=4)*(k=16) i=___________j=_______________,k=_________________ 教师批改:64,4,16 7、Write a for loop control line to count from 1 to 100____________ 教师批改:for(k=1;k<=100;k++) 8、Write a for loop control line to count backward by twos from 100 to 0________________ 教师批改:for(k=100;k>=0;k=k-2) 9、The following C program compiles and runs without errors. Write the output of this program._____________ #include void main( ) { int i = -1; int j = 1; if( 0 < i || i < 10 ) if(j > i) printf("A"); else printf("B"); else printf("C"); } 教师批改:A 10、What is the output of the following code? #include void main() { int day_of_week = 4; switch (day_of_week) { n"); case 0: printf("today is Sunday.\ case 1: printf("today is Monday.\n"); case 2: printf("today is Tuesday.\n"); case 3: printf("today is Wednesday.\n"); case 4: printf("today is Thursday.\n"); case 5: printf("today is Friday.\n"); case 6: printf("today is Saturday.\n"); default: printf("Something is missing."); break; } } /*___________________________*/ 教师批改:today is Thursday today is Friday. Today is Saturday. Something is missing. 11、The following C program is compiled and runs successfully. Write the output the following program produces. #include #define NRows 5 void main() { int i, j; for (i = 1; i <= NRows; i++) { for (j = i; j < NRows; j++) { printf(" "); } for (j = 0; j < 2 * i - 1; j++) { printf("*"); } printf("\n"); } } 教师批改:‘* * * * * * * * * * * * * * * * * * * * * * * * * 12、The following C program is compiled and runs successfully. Write the output the following program produces. #include void main() { int a[6][6],i,j; for(i=1;i<6;i++) for(j=1;j<6;j++) a[i][j]=(i/j)*(j/i); for(i=1;i<6;i++) { for(j=1;j<6;j++) printf(""%2d"",a[i][j]); printf(""\n""); } } 教师批改:1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 13、The following code fragment is placed in a complete program, compiled and run without errors. Write the output of the following code: int i; for(i=10;i>=0;i-=3) printf("%d",i-1);/*_____________________*/ 教师批改:9630 14、How many lines of output does the following program print? #include void main( ) { int i,j; for(i=0;i<5;i++) for(j=0;j<5;j++); printf("Hello world!\n"); } 教师批改:1 15、Complete the program below to produce the following output: 1 x 12 = 12 2 x 12 = 24 3 x 12 = 36 10 x 12 = 120 11 x 12 = 132 12 x 12 = 144 #include void main(void) { int i; for( __________ ; ____________ ; ___________ ) printf(""%d x 12 = %d\n"", __________ , __________ ); } 教师批改:i=1 i<12 i++ i*12 \n 16、The following C program is compiled and runs successfully. Write the output the following program produces. #define LowerLimit 1 #define UpperLimit 4 #include void main() { int i; printf("Number Square Cube\n"); for (i = LowerLimit; i <= UpperLimit; i++) { printf(" %2d %3d %4d\n", i, i * i, i * i * i); } } 教师批改:1 1 1 、2 4 8 、3 9 27 17、While we‘re on the subject of silly songs,another old standby is "This Old Man" for which the first verse is This old man,he played 1.He played knick-knack on my thumb.With a knick-knack,paddy-whack,Give your dog a bone.This old man come rolling home.Each subsequent verse is the same,except for the number and the rhyming word at the end of the second line,which gets replaced as follows: 2-shoe 3-knee 4-door 5-hive 6-sticks 7-heaven 8-pate 9-spine 10-shin Chapter 5 Function 1、Consider the following program: #include int f(int x,int y) {return ((y-x)*x);} void main() { int a=3,b=4,c=5,d; d=f(f(a,b),f(a,c)); printf("%d\n",d); } A)10 B)9 C)8 D)7 教师批改:B 2、The following program compiles and executes without errors. Write the output of this program. (8 Points) #include int foo(int x) { x++; return x; } int bar(int y) { y--; return y; } void main() { int x = 1; int y = 3; foo(x); bar(y); printf("%d %d\n",x,y); y = foo(x); x = bar(y); printf("%d %d\n",x,y); } _________________________ _________________________ 教师批改:1 3 1 2 3、The following program compiles and executes without errors. Write the output of this program. #include int count1(int k) { int x = 1; x = x + k; printf("%d ",x); return x; } int count2(int k) { static int x = 1; x = x + k; printf("%d",x); return x; } void main( ) { count1(count1(1)); count2(count2(2)); } _________________________ _________________________ 教师批改:2 3 3 6 4、The following C program is compiled and runs successfully. Write the output the following program produces. int fun(int x, int y, int z) { z=x*x+y*y; } void main( ) { int a=31; fun(5,2,a); printf("%d",a); }/*_____________*/ 教师批改:31 5、The following program compiles and executes without errors. Write the output of this program. #include int pfft(int x) { if (x==0) return 0; /* Hint: % gives the remainder, example 5%2 is 1 */ if( (x % 2) != 0 ) return (1 + pfft(x - 1)); else return (3 + pfft(x - 1)); } void main() { printf("%d \n",pfft(7)); } 教师批改:13 6、The following C program is compiled and runs successfully. Write the output the following program produces. #include void main( ) { int w=2; void fun(int); fun(w); } void fun(int k) { if (k>0) fun(k-1); printf(“%d”,k); } 教师批改:0 1 2 7、What output will the following piece of code produce? void foo(int c) { c = 20; } void bar(int d[]) { d[1] = 30; } void main(void) { int x = 10; int y = 15; int a[2] = {1, 2}; int b[2] = {3, 4}; foo(a[0]); printf("%d %d %d %d %d %d\n", x, y, a[0], a[1], b[0], b[1]); /*___________________*/ bar(b); printf("%d %d %d %d %d %d\n", x, y, a[0], a[1], b[0], b[1]); /*__________________*/ foo(y); printf("%d %d %d %d %d %d\n", x, y, a[0], a[1], b[0], b[1]); /*__________________*/ bar(a); printf("%d %d %d %d %d %d\n", x, y, a[0], a[1], b[0], b[1]); /*________________________*/ } 教师批改:10 15 1 2 3 4 10 15 1 2 3 30 10 15 1 2 3 30 10 15 1 30 3 30 8、The following C program is compiled and runs successfully. Write the output that this program produces. #include void main() { int a=1,b=2,c=3; a+=b+=++c; printf("%5d%5d%5d\n",a,b,c);//(1)______________________ { float b=4.0; int c; a+=c=5*b; printf("%5d%5.1f%5d\n",a,b,c);//(2)_____________________ } printf("%5d%5d%5d\n",a,b,c);(3)_________________________ } 教师批改:(1)7 6 4 (2)27 4.0 20 (3)27 6 4 9、Write a function Fib(n) to calculate the nth Fibonacci number. Chapter 11 Arrays 1、It is an array declaration: int a[3]; Which one is invalid to refer to particular members of arrays : A\ a[0] B\ a[1*2] C\ a[4-2] D\ a[3] 教师批改:D 2、Assume we have declared the two dimensional array A in the C language, int A[3][2] = { 0, 1, 2, 3, 4, 5 }; Write the value of A[2][1].____________ 教师批改:5 3、This program computes the average of all the values of an array named ‘list’. Assume that the count of the number of values is 100 or fewer. #include #define ARRAY_SIZE 100 main( ) { int list[ARRAY_SIZE]; int count = 0; double total = 0.0; while( scanf("%d", &list[ count ])==1) { total =____________; count =____________; printf("average = %lf \n",______________); } 教师批改:total=total+list[count]; count=count+1; total/count 4、This program reads in an array of integers, reverses the elements of the array, and then displays the elements in their reversed order. Please complete the program. #define MaxElement 5 #include void input(int a[],int n); void reverse(int a[],int n); void output(int a[],int n); void main() { int i,array[MaxElement]; input (array,MaxElement); reverse(array,MaxElement); output (array,MaxElement); } void input(int a[],int n){ int i; for(i=0;i void fun(int *a,int *b) { int *c; c=a;a=b;b=c; } void main() { int x=3,y=5,*p=&x,*q=&y; fun(p,q);printf("%d,%d,",*p,*q); fun(&x,&y);printf("%d,%d\n",*p,*q); } The output of the program is ________ A)3,5,5,3 B)3,5,3,5 C)5,3,3,5 D)5,3,5, 教师批改:B 2、1.What’s the result with the following program?( ) #include void main(){ char *p=“abcdefgh”; printf(“%d\n”,strlen(strcpy(p+3,”ABCD”))); puts(p); } A)8 B)12 C)4 D)7 教师批改: 3、1.What’s the result with the following program?( ) sub(int x,int y,int *z) { *z=y-x;} void main() { int a,b,c; sub(10,5,&a); sub(7,a,&b); sub(a,b,&c); printf(“%4d,%4d,%4d\n”,a,b,c); } A)5,2,3 B)-5,-12,-7 C)-5,-12,-17 D)5,-2,-7 教师批改:B 4、#include void f(int *p,int *q); void main() { int m=1,n=2,*r=&m; f(r,&n);printf("%d,%d",m,n); } void f(int *p,int *q) { p=p+1; *q=*q+1; } A)1,3 B)2,3 C)1,4 D)1,2 教师批改:A 5、What‘s the output with the following program? #include void f(int *p,int *q); void main() { int m=1,n=2,*r=&m; f(r,&n);printf("%d,%d",m,n); } void f(int *p,int *q) { p=p+1; *q=*q+1; } A)1,3 B)2,3 C)1,4 D)1,2 教师批改:A 6、"Consider the following code fragment: int x = 5; int *y = &x; int *z; (*y)++; z = y; printf(""%d"", *z); What is the output? ___________ " 教师批改:6 7、"The program below compiles without errors and executes correctly. Write the output of this program.(6 Points) #include void foo(int *a) { *a += 5; } void bar(int b[]) { b[1] = 15; } main( ) { int a[3] = { 3, 4, 5}; int b[3] = { 3, 4, 5}; int *p2; p2 = &a[0]; (*p2)++; bar(p2); printf(""%d %d %d \n"", a[0],a[1],a[2]); p2 = &b[1]; foo(p2); bar(p2); printf(""%d %d %d \n"", b[0],b[1],b[2]); } ____________________________________ ____________________________________ " 教师批改:"4 15 5 \ 3 9 15 " 8、Declarations and initializations as following: int i=3,j=5,*p=&i,*q=&j,*r; double x; Evaluate the following expressions: p==&i//(1)______ **&p //(2)______ r=&x //(3)_______ 7**p/ * q+7 //(4)________ *(r=&j)*=*p//(5)__________ 教师批改:(1) 1 (2) 3 (3) illegal (4) 11 (5) 15 9、#include void try_me(int [ ][3]); int main(void){ int a[3][3] = {{2, 5, 7}, {0, -1, -2}, {7, 9, 3}}; try_me(a); return 0; } void try_me(int (*a)[3]){ printf("%d %d %d %d . . . infinity\n", a[1][0], -a[1][1], a[0][0], a[2][2]); } 教师批改:0 1 2 3 „ infinity 10、" The program below compiles without errors and executes correctly. Write the output of this program.(8 Points) #include void swap1(int a, int b) { int tmp = a; a = b; b = tmp; } void swap2(int a[]) { int tmp = a[0]; a[0] = a[1]; a[1] = tmp; } void swap3(int *a, int *b) { int tmp = *a; *a = *b; *b = tmp; } void tripleswap(int *a, int *b, int *c) { int tmp = *a; *a = *b; *c = tmp; *b = *c; } main(){ int a[2]; a[0] = 0; a[1] = 1; swap1( a[0], a[1] ); printf(""%d, %d\n"", a[0], a[1] ); swap2( a ); printf(""%d, %d\n"", a[0], a[1] ); swap3( &a[0], &a[1] ); printf(""%d, %d\n"", a[0], a[1] ); a[0] = 0; a[1] = 1; tripleswap( &a[0], &a[1], &a[0] ); printf(""%d, %d\n"", a[0], a[1] ); } _____________________________________________ _____________________________________________ _____________________________________________ _____________________________________________ " 教师批改:"0 1\1 0\0 1\1 0" 11、Design a function prototype that would allow a single function to find and return simultaneously both the lowest and highest values in an array of type double. 南昌大学实验报告 学生姓名: 学号: 专业班级: 实验类型:? 验证 ? 综合 ? 设计 ? 创新 实验日期: 实验成绩: 一、实验项目名称 N Queen Problem (Machine Practice) 二、实验目的 【Objectives】 The machine problem is to train the student to integrate all the knowledge from the books to solve the problem. To improve the ability of programming in C and active the interesting at C programming language through this integrated experiment. 三、实验要求 【Contents】: A square which is composed of n multiplied by n blocks is called “ checkerboard of n elements ”. If two queens are located in the same line or the same column or even the same diagonal line, we say they attack each other. Write a C program to display all of the overall arrangements when all of the n queens on the checkerboard don’t attack each other. 【Steps】: 1. Solutions a. The queen couldn’t be put in the same row or column, and couldn’t in the diagonal line. b. How to make sure that no queen can be put in the same row and column? We can use an array x[n] to represent the Nth row and x[n]=k to represent that the Nth queen be put in the Kth column. We can use a loop to compare the value of x[i](00, implement. x[k]?x[k]+1 go to loop when x[k]?n and place (k)=false , implement. If x[k]?n and if k=n printf(x[]) else k?k+1; else k?k-1 Then end the Algorithms Secondly: Write a function “place(k)”to check if the Kth queen can be placed in the position of x[k]. ?. [place the first value] i?1. a. [check the position ] make a loop. When i #include //主函数Solving Problem main() { int place(int a[],int j);//函数声明 int x[9], r, count=0, k=1; 变量定义 x[1]?0 k?1 x[1]=0;// //以下计算全解 while(k>0)//当k>0时,循环 { x[k]=x[k]+1;//k>0时，执行 x[k]?x[k]+1 while(x[k]<=8&&place(x,k)==0)//当x[k]?n且place函数返回值为假 时, 进入嵌套循环 x[k]=x[k]+1;//执行 x[k]?x[k]+1 if(x[k]<=8)//If x[k]?n if(k==8)//嵌套if k=n时，输出结果 { for(r=1;r<9;r++) printf("%d ",x );//输出结果 printf("\n"); count++;//结果计数器 } 嵌套else k=k+1;x[k]=0; else // { k=k+1; x[k]=0; } else k=k-1;//Else k=k-1 } printf("8后问题共%d组全解\n\n",count); count=0,//计数器清零 k=1;//变量再次赋值初始化 x[1]=0;//再次赋值初始化 //以下计算有效解 while(k>0) { x[k]=x[k]+1; while(x[k]<=8&&place(x,k)==0) x[k]=x[k]+1; if(x[k]<=8) if(k==8) { if(x[1]<=4) //仅此处与求全解的程序段不同，因为有效解中“后”的位置不能超过n/2 {for(r=1;r<9;r++) printf("%d ",x ); printf("\n"); count++;} } else { k=k+1; x[k]=0; } else k=k-1; } printf("%d组是有效解\n",count); } //place函数判断“后”是否能放在某一位置 int place(int a[8],int j) { int i=1;//赋值i<-1 while(i