#include "stdio。h"
#include "stdlib。h"
#include "time。h"
#include "string。h"
void main()
{
    int firstNum, secondNum, operatorNum, result, intInput;
    char operatorChar;
    char inputTemp[256];
    srand(time(NULL));
    while (1)
    {
        firstNum = rand() % 10;
        secondNum = rand() % 10;
        operatorNum = rand() % 2;
        if (operatorNum == 0)
        {
            operatorChar = '+';
            result = firstNum + secondNum;
        }
        else
        {
            operatorChar = '-';
            result = firstNum - secondNum;
        }
        printf("input 'q' to exit\n\n");
        printf("\nlet's go。
  。。\n");
        printf("\t\t%d %c %d = ", firstNum, operatorChar, secondNum);
        scanf("%s", inputTemp);
        if (inputTemp[0] == 'q')
            break;
        intInput = atoi(inputTemp); /*转换不成功则intInput==0,而正确输入也可以为0,这里没有处理!*/
        if (intInput == result)
        {
            printf("\tright   next。
  。。");
            sleep(1);
            clrscr();
            continue;
        }
        else
        {
            printf("\terror   next。
  。。");
            sleep(1);
            clrscr();
            continue;
        }
    }
}
。