编写一个小学生数学减法练习程序.
要求:给出10道练习题.每道练习题是形如"a-b="的数学式,其中a,b是两位数的正整数,而
     且要求a>=b.
     每次出题,要求小学生输入答案.如果正确,加10分.如果错误,可以再输入一次.如果
     第二次正确,则加5分,否则不加分.
     做完10道题后,给出总分,并根据总分,给出优秀(85-100),良好(70-84),及格(60-
     69),不及格(<60)的评价.

#include <stdio.h> #define N 10 void main() { int n,i,sum,a,b,count; printf("小学生数学减法练习程序\n"); randomize(); count=0; for(i=0;i<N;i++) { printf("第%d题:",i+1); a=rand();b=rand(); if(a<b){n=a;a=b;b=n;} sum=a-b; printf("%d-%d=",a,b); scanf("%d",&n); if(n==sum)count+=10; else { printf("答案错误,请再输入一次:"); scanf("%d",&n); if(n==sum)count+=5; } } if(count>=85)printf("优秀!"); else if(count>=70)printf("良好!"); else if(count>=60)printf("及格!"); else printf("不及格!"); }

没有编译过,可能有错误

斑竹,,,C语言里也有randomize(); 这个函数么?

当然有，我用过，不过忘了头文件是哪个了，反正不是stdio.h就是stdlib.h

是TC啊

#include <stdio.h>
#include "stdlib.h"
//#include "time.h"

#define N 10
void main()
{
    int n,i,sum,a,b,count;
   
    printf("小学生数学减法练习程序\n");
    rand();
    count=0;
    for(i=0;i<N;i++)
    {
        printf("第%d题:",i+1);
        a=rand();
        b=rand();
        if(a<b)
        {
            n=a;
            a=b;
            b=n;
        }
        sum=a-b;
        printf("%d-%d=",a,b);
        scanf("%d",&n);
        if(n==sum)
            count+=10;
        else
        {
            printf("答案错误,请再输入一次:");
            scanf("%d",&n);
            if(n==sum)count+=5;
        }
    }
    if(count>=85)
        printf("优秀!");
    else if(count>=70)
        printf("良好!");
    else if(count>=60)
        printf("及格!");
    else printf("不及格!");
    while(1);
}