这一次实验是随机生成30道简单的四则运算。
思路1.随机数的生成，俩个是一样的。
2.利用整除四求余实现运算符的随机生成（1对应+，2对应-，三对应*，4对应÷）
3.分数运算时分母不能为0
4.真分数分子要小于分母。
以下为实验代码：
//信1301-2班 20132903 朱子嘉
//2016/3/6
#include "iostream"
#include "time.h"
using namespace std;
void main()
{
int a,b,c,i,n,k,d1,d2,d3,d4;
char m;
srand((int)time(NULL));//避免出现重复的30道题
for (i = 0; i < 30; i++)
{
//生成随机数
a = rand() % 100;
b = rand() % 100;
d1 = rand() % 100;
d2 = rand() % 100;
d3 = rand() % 100;
d4 = rand() % 100;
n = rand() % 3;//生成1或2，1有分数，2无分数
k = rand() % 4;//生成1，2或3，1为a是分数，2为b是分数，3为a，b都是分数
c = rand() % 100;//生成运算符号
c = c % 4;
if (c == 1)
m = '+';
if (c == 2)
m = '-';
if (c == 3)
m = '*';
if (c == 0)
m = '/';
//输出
if (n == 1)
{
if (k == 1)
{
if (d1>=d2)
cout << d2 << "/" << d1 << " " << m << " " << b << "=" << endl;
else
cout << d1 << "/" << d2 << " " << m << " " << b << "=" << endl;
}
if (k == 2)
{
if (d3>=d4)
cout << a << " " << m << " " << d4 << "/" << d3 << "=" << endl;
else
cout << a << " " << m << " " << d3 << "/" << d4 << "=" << endl;
}
if (k == 3)
{
if (d1 >= d2)
{
if (d3 >= d4)
cout << d2 << "/" << d1 << " " << m << " " << d4 << "/" << d3 << "=" << endl;
else
cout << d2 << "/" << d1 << " " << m << " " << d3 << "/" << d4 << "=" << endl;
}
else
{
if (d3 >= d4)
cout << d1 << "/" << d2 << " " << m << " " << d4 << "/" << d3 << "=" << endl;
else
cout << d1 << "/" << d2 << " " << m << " " << d3 << "/" << d4 << "=" << endl;
}
}
}
else
cout << a << " " << m << " " << b << "=" << endl;
}
}
结果如下图：
