从《构建之法》第一章的 “程序” 例子出发，像阿超那样，花二十分钟写一个能自动生成小学四则运算题目的命令行 “软件”，满足以下需求：

（以下参考博客链接：http://www.cnblogs.com/jiel/p/4810756.html）

include <stdio.h>
include <stdlib.h>
include <time.h>

void generate_arithmetic_problem(int* num1, int* num2, char* op) {
*num1 = rand() % 10 + 1;
*num2 = rand() % 10 + 1;
*op = ((rand() % 2 == 0) ? '+' : ('-' + rand() % 2));
}

int main() {
int num1, num2, result;
char op;
int count = 0;

srand(time(NULL));

while (count < 10) {
    generate_arithmetic_problem(&num1, &num2, &op);
    printf("问题：%d %c %d = ", num1, op, num2);
    scanf("%d", &result);

    if (result == (num1 * op + num2)) {
        printf("答案正确！\n");
        count++;
    } else {
        printf("答案错误！\n");
    }
}

return 0;

}