C语言程序改错基本题库

1、北京石油化工学院12级复习题程序改错一、下面每个程序的划线处有语法或逻辑错误，请找出并改正，使其得到符合题意的执 行结果。1 .求 1234n main() long int sum;int n,i=1; scanf("%d",n); printf( "n"); while(i<n) sum=sum*i;i+； printf("sum=%d",sum); 2 .求一个数组中最大值及其下标。 main() int max,j,m;int a5;for(j=1;j<=5;j+) scanf( " %d ,a); ma

2、x=a0;for(j=1;j<=5;j+) if(max>aj) max=aj; m=j; printf(“下标：dn 最大值：d” , j, max)*3.求 3+4int a=3,b=4; main() int a,c;c=a+b;printf("c=%d' );4.用一个函数求两个数之和。sum(x,y)float z;z=x+y;return;main() float a,b;int c;scanf("%f,%f",&a,&b);c=sum(a,b);printf("nSum is %f",sum);

3、5.用指针作函数参数，对输入的两个整数按大小顺序输出。swap(int *p1,*p2) int *p;*p=*p1;*p1=*p2;*p2=*p;main() int a,b;int *q1,*q2;scanf("%d,%d",&a,&b);&q1=a,&q2=b;if(a<b) swap(*q1,*q2);printf("n%d,%dn",q1,q2);前五题答案：应初始化即加入sum=1第四行改为：scanf( "%d ,&n);第六行改为：while(i<=n)第十行改为：printf

4、("sum=%ld",sum);2 .第四行改为：for(j=0;j<5;j+)第五行改为：scanf( "%d ,&aj);第七行改为：for(j=0;j<5;j+)第八行改为：if(max<aj)第十三行改为：printf( "下标：dn最大值：d” , m,max)3 .第三行改为：int c;第五行改为：printf("c=%d'，c);4 .第一行改为：float sum(float x, float y );第四行改为：return(z);第八行：float c;第 H一亍：printf("

5、;nSum is %f",c);5 .第 2、3 行： int t;t=*p1;*p1=*p2;*p2=t;第 9 行：q1=&a,q2=&b;第 10 行:if(a<b) swap(q1,q2);第 11 行：printf("n%d,%dn",*q1,*q2);6 .程序读入20个整数，统计非负数个数，并计算非负数之和#includemain()int i, a20, s , count ;s=count=1; s=count=0;for( i=1; i<20; i- -)for(i=0;i<20;i-)scanf( "

6、;%d , ai );scanf( "d ,&ai);for(i=0;i<20;i+)if(ai<0)break; continue; ，i.，=!1 JI l=，L， I 1 ，、I -s +=ai;count+;printf("s=%n" , s, count);printf( "s=%d count=%dn ” ,s,count);7 . x , y 两个数中，让x中存较大的数，y存较小的数#include<>main()int x , y=200 , z=0;x=180;if ( x<y)z=x; x=y;

7、y=z; z=x;x=y;y=z;printf( "x=%d,y=%dn” ,&x,&y);printf(;x=.%.d.,y=%dn：.凶.y);. 一8 .从键盘输入整数x的值，并输出y的值.main() float x,y;正确的: int x; float y;scanf("%d ,&x);y=+x;printf("y=%d')；printf("y=%f"，y);9 .从1加到100,并输出.Main ()int i , sumi=1;While ( i<=100 ) sum=sum*i; i+ ；

8、 printf ("%、, sum )10、求一个4X4矩阵的对角线元素之和 main()int a44, sum=0;int i,j；printf("Enter data:n");for(i=0;i<=4;I+)for(j=0,j<=4;j+)scanf( "%( ,&aij);for(i=0;i<4;I+)fo止0;j<4;j+)sum=sum+aij; printf("sum=%5dn' ,sum);12 .求1+2+3+4+n的值。 main() long int sum;int n,i=1;sc

9、anf("d",&n);printf( "n” ); while(i>n) sum=sum*i; i+; printf("sum=%d",sum); *13.调用起泡法函数排序void sort(int a, n); int i,j,temp,*p;for(i=0; i<n-1; i+)for(j=n-1; j>i; j-)if(dataj< dataj-1)temp=aj;aj= aj-1； aj-1=temp; main() int data10;*p=data;printf("Please inp

10、ut 10 numbers:n");for(i=0; i<NUM; i+,p+) scanf("%d", &p);p=&data0;sort(data10,10);printf("nthe result of sort:n");for(i=0; i<10; i+) printf("%d ",datai);15 .编程计算下面分段函数，输入x,输出ymain() int x,y;printf( "n” );scanf( "%d , x);if(x<0)y=x-1;else

11、if(x>=0|x<=10)y=2x-1elsey=3x-1; printf("y=%d , &y);16 .求100300间能被3整除的数的和。main() int n;long sum;for(n=100;n<=300;n+)if(n%3=0) sum=sum*n;printf( "% l d " ,sum); 17.用函数实现两个整数的交换。swap(int *p1,int *p2) int *p;p=p1；p1=p2p2=pmain() int a,b;printf( " nInput a,b: ");scan

12、f( "%d,%d ,&a,&b);swap(&a , &b ); printf( " n%d,%d ,a,b);18 .实现华氏温度转换为摄氏温度，公式为：c=*(f-32),要求输出结果取 2位小数。main() int c , f;printf("Please enter f:")；scanf("%f" , &f);c=5/9*(f-32);printf("f=%f,c=%f" , c, f) ; 19 .下面程序的功能是计算n!。main() int i , n;in

13、t s ;printf("Please enter n:")；scanf("%d" , n);for(i=1 ; i<=n ; i+); s=*i ；printf("%d! = %d", i , s) ; 20 .编程计算12+ 32+ 52+ 92,要求输出中间计算结果。 main() int i , sum=0;for(i=1 ; i<=9 : i+2),sum);sum+=i; printf("sum = %d"21 .求表达式的值#include <> #include <&g

14、t; int fun(int x, int y);main() int a,b; float f;scanf( "%d,%d ,a,b);if(ab>0) f = fun(a,b); printf("The result is:%dn", &f) else printf("error! " );fun(x, y) float result;result = sqrt(a+b);return;22、通过函数调用，求两个数之差sub(x,y) float z;z=x-y; return; main() float a,b;int c;

15、scanf( "f,%f”，&a,&b);c=sub(a,b);printf( "nSub is %f ” ,sub);23、求1至ij 100的累加和.main ()int i , sumi=1;while ( i<=100 ) sum=sum*i j i+ ; printf ("%C , sum )24、一个小于1000的正整数每位上的数字是多少。#include "" main() int n,i,j,k;printf("Input a number n(0<n<1000):n");s

16、canf("%d",n);if(n<=0|n>=1000)printf("error");exit(0);k=n%;j=(n%100)/10;i=n/100;printf("%s %s %sn”,i,j,k);25、输入三角形的三边长，求三角形的面积。#include <>main()float a,b,c,s,area;scan("%d,%d,%d”,a,b,c);s=2*(a+b+c);area=sqrt(s(s-a)(s-b)(s-c);printf("a=%,b=%,c=%,s=%n”,&am

17、p;a,&b,&c,&s);printf("area=%n”,&area)26、求和 1! +2! +3! +4! +20!。main()float s=0,t=0;int n;for(n=0;n<20;n+)t=t+n;s=s*t; printf("1 ! +2! +3! +4! +20!=%d'n",s); *27、下面程序实现的功能是求两整数的最小公倍数。#include ""main() int m ,n , result1;resultprint( "input two inte

18、gers:n ");scaf( "%d %d , m, n);&m,&nresult=m<n ? n: m ;while( (result % m !=0 ) | ( result % n = =0) )!=n"，&result);result+;printf( "The least common multiple of m and n is %dresult28.下列程序实现按分数从高到低的顺序输出，划线处存在错误，请予以更正#include <>#define ARR_SIZE 40void Sort(flo

19、at score口，long num口，int n)main() float scoreARR_SIZE;int n, i;long numARR_SIZE;printf("Please enter total number:");scanf("%dn", n);printf("Please enter the number and score:n");for (i=0; i<n; i+) scanf("%ld%f",&numi,&scorei); Sort(score, num, n);pr

20、intf("Sorted results:n");for (i=0;i<n;i+) printf("%ldt%n",numi,scorei);void Sort(score, num, n) int i, j;float temp1;long temp2;for (i=0; i<n-1; i+) for (j=i; j<=n; j+) if (scorej < scorei) tempi = scorej;scorej = scorei;scorei = tempi;temp2 = numj;numj = numi;numi =

21、temp2;29.把用户输入的数据累加，直到输入零为止，输出累加的结果。#include<>main() intt sum=0,d;printf("Enter a serial of numbers ended by 0:n");while(1) scanf("%d",d);if(d=0) break;sum+=d;printf("sum=%fn",sum);正确：scanf("%d",&d);正确： d=0正确： printf("sum=%dn",sum) ;30、求 1+

22、2+3+4+n(n<100)fun(n);main() int p, n；scanf("%d",&n);p=int fun(n);printf("p=%d",p);int fun(int m) int total;int i=1;正确：正确：正确：#include<>while(i<=m) total=total+i;i+；正确：return;32.求一个3X3矩阵的主对角线元素之和main() int a33; int sum;int i,j；printf( "Enter data:n ");for(i=0;i<3;i+)for(j=0,j<3,j+)scanf("f”，&aij);for(i=0;i<3;i+)for(j=0,j<=3;j+)if (i=j)sum +=aij;printf("sum=%5dn' ,sum);33.摄氏温度C=(5/9)(F-32),求华氏温度F=100时对应的摄氏温度#include <>void main(void)int celsius; fahr;fahr = 100;celsius = 5 * (fahr - 32) / 9;p