编辑代码

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main () 
{
    int num1,num2,answer,count;
    printf("    简单算术练习程序    \n");
    printf("***********************\n\n");
    printf("    1 ----- 加法\n");
    printf("    2 ----- 减法\n");
    printf("    3 ----- 乘法\n");
    printf("    4 ----- 除法\n\n");
    printf("***********************\n");
    printf("请选择运算：");
    scanf("%d",&count);
    srand(time(NULL));
    num1 = rand()%10;
    num2 = rand()%10;
    switch(count)
    {
    case 1:
        printf("%d+%d = ",num1,num2);
        scanf("%d",&answer);
        if(answer = num1+num2)
        printf("回答正确\n");
        else printf("回答错误\n");
    break;
    case 2:
        printf("%d-%d = ",num1,num2);
        scanf("%d",&answer);
        if(answer = num1-num2)
        printf("回答正确\n");
        else printf("回答错误\n");
    break;
    case 3:
        printf("%d*%d = ",num1,num2);
        scanf("%d",&answer);
        if(answer = num1*num2) 
        printf("回答正确\n");
        else printf("回答错误\n");
    break;
    case 4:
        printf("%d/%d = ",num1,num2);
        scanf("%d",&answer);
        if(answer = num1/num2)
        printf("回答正确\n");
        else printf("回答错误\n");
    break;
    }
    return 0;
}