四则运算题目的程序

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<math.h>
void Shengcheng();
void Simple();
void real();
void result();
int MaxGYS(int a, int b);
int system(const char *string);

int main(void)
{
    int n;
Loop1: printf("\n\n\n\n\t\t\t耿丹13计科-1胡新宇\n\n\t\t\t[1] 小学数学无分数十道四则运算练习题\n\n\t\t\t[2]小学数学分数四则运算练习题\n\n\t\t\t[3] 退出程序\n\n\t\t\t请输入相应的选项,按回车键确定:");
    scanf_s("%d", &n);
    system("cls");
    if (n == 1)
        Shengcheng();//到整数十道题界面
    else
        if (n == 2)
            result();//分数界面
    else
        if (n == 3)
        {
            printf("\n\n\n\n\n\n\t\t再见\n\n\t\t");//退出界面
            return 0;
        }
        else
            printf("输入错误请重新输入");//错误提示
    goto Loop1;//回到主界面
    return 0;
}

void Shengcheng()//整数十道运算随机题
{
    int i, a, b, p, q, r, c, sum = 0, d = 0, e = 0;
    srand((unsigned)time(NULL));
    printf("请做下面十道四则运算题，加油哦！\n\n");
    for (i = 0; i < 10; i++)
   {
        a = rand() % 50;
        b = rand() % 50;
        p = rand() % 50;
        q = rand() % 50;
        r = rand() % 50;
        while (r == 0)
        {
            i--;
        }
        while (r != 0)
        {
            printf("请输入你的答案：%d+%d-%d*%d/%d=", a, b, p, q, r);
            scanf_s("%d", &c);
            printf("\n");
            if ((a + b - p*q / r) == c)

            {
                printf("恭喜你答对了！干的不错！\n\n");
                sum = sum + 10;
                e = e + 1;
            }
            else
            {
                printf("答案错误！请继续努力！\n\n");
                d = d + 1;
            }
            break;//返回
        }
        continue;
    }
    printf("你总共答对了%d道题，答错了%d道题。\n\n", e, d);

    printf("你的得分为：%d分继续努力哟！\n\n", sum);
    return ;
}

void Simple()
{
    int m, b, c, d, t;
    m = rand() % 3 + 1;
    b = rand() % 20 + 1;
    c = rand() % 20 + 1;
    switch (m)
    {
    case 1: {
        d = b + c;
        printf("%d+%d=\t\t\t\t\t\t\t\t\t%d\n", b, c, d);
    }break;
    case 2: {
        if (b>c)
        {
            t = b;
            b = c;
            c = t;
        }
        d = b - c;
        printf("%d-%d=\t\t\t\t\t\t\t\t\t%d\n", b, c, d);
    }break;
    case 3: {
        d = b*c;
        m = rand() % 2 + 1;
        if (m == 1)
            printf("%d*%d=\t\t\t\t\t\t\t\t\t%d\n", b, c, d);
        else
            printf("%d/%d=\t\t\t\t\t\t\t\t\t%d\n", d, b, c);
    } break;
    }
    return;
}
void real()//分子分母
{
    int a, b, c, d, e, f, g, h, t;
    a = rand() % 4 + 1;
    b = rand() % 9 + 1;//第一个数字分子
    c = rand() % 9 + 1;//第一个数字分母
    d = rand() % 9 + 1;//第二个数字分子
    e = rand() % 9 + 1;//第二个数字分母
    if (b>c)
    {
        t = b;
        b = c;
        c = t;
    }
    if (d>e)
    {
        t = d;
        d = e;
        e = t;
    }
    switch (a)
    {
    case 1: {
        f = c*e;
        g = b*e + d*c;
        h = MaxGYS(g, f);
        f = f / h;
        g = g / h;
        printf("(%d/%d)+(%d/%d)=\t\t\t\t\t\t\t\t(%d/%d)\n", b, c, d, e, g, f);
    }break;
    case 2: {
        f = c*e;
        g = b*e - d*c;
        if (g>0)
        {
            h = MaxGYS(g, f);
            f = f / h;
            g = g / h;
            printf("(%d/%d)-(%d/%d)=\t\t\t\t\t\t\t\t(%d/%d)\n", b, c, d, e, g, f);
        }
        else
        {
            g = abs(g);
            h = MaxGYS(g, f);
            f = f / h;
            g = g / h;
            printf("(%d/%d)-(%d/%d)=\t\t\t\t\t\t\t\t(%d/%d)\n", d, e, b, c, g, f);
        }
    }break;
    case 3: {
        f = c*e;
        g = b*d;
        h = MaxGYS(g, f);
        f = f / h;
        g = g / h;
        printf("(%d/%d)*(%d/%d)=\t\t\t\t\t\t\t\t(%d/%d)\n", b, c, d, e, g, f);
    }break;
    case 4: {
        f = b*e;
        g = c*d;
        h = MaxGYS(g, f);
        f = f / h;
        g = g / h;
        printf("(%d/%d)/(%d/%d)=\t\t\t\t\t\t\t\t(%d/%d)\n", b, c, d, e, g, f);
    }
    default:break;
    }
    return;
}
int MaxGYS(int a, int b)//定义a,b中的最大值为整型变量
{
    int c, t;
    if (a<b)
    {
        t = a;
        a = b;
        b = t;
    }
    while (b != 0)
    {
        c = a%b;
        a = b;
        b = c;
    }
    return a;
}
void result()//分数四则随机题
{
    int m, i;
    for (i = 0; i<30; i++)
    {
        m = rand() % 2 + 1;
        if (m == 1)
            Simple();
        else
            real();
    }
    system("pause");
    system("cls");
    system("pause");
    system("cls");
    return  ;

}