随手一写，简单的四则运算练习

其实是赶作业的产物，做的十分粗糙，错漏也存在，但姑且算是完成了吧，下次不能到最后时间才行动了。

by c language

#include "stdafx.h"
#include "time.h"
#include "stdlib.h"

int randnum(int numlv)
{
int num;
num = rand() % numlv;
return num;
}
int randsym(int symly)
{
int sym;
sym = rand() % symly+1;
return sym;
}
int _tmain(int argc, _TCHAR* argv[])
{
int a, b, s, nlv, slv,sym,num=0,rt=0,wr=0;
srand(time(NULL));
printf_s("请输入数字上限 ");
scanf_s("%d", &nlv);
printf_s("请输入算符等级（1.二则，2.四则）");
scanf_s("%d", &slv);

while (num != -1)
{
a = randnum(nlv);
sym = randsym(slv);
b = randnum(nlv);
if ((a - b) < 0 )
sym = 5;
if (sym == 4)
{
if (b == 0)
sym = 5;
if (a / b != 0)
sym = 5;
}
switch (sym)
{
case 1:s = a + b;
printf_s("%d+%d=", a, b);
break;
case 2:s = a - b;
printf_s("%d-%d=", a, b);
break;
case 3:s = a * b;
printf_s("%d*%d=", a, b);
break;
case 4:s = a / b;
printf_s("%d/%d=", a, b);
break;
default:break;
}
if (sym != 5)
{
scanf_s("%d", &num);
if (num == s)
{
printf_s("right! ");
rt++;
}
else
{
printf_s("wrong! ");
wr++;
}
}
}
printf_s("总共做了%d个题，正确%d个，错误%d个",rt+wr-1,rt,wr -1);
scanf_s("%d", &a);
return 0;
}

 程序不是重点，主要是学习使用GIT。