今天下午小测：四则运算
第一次用c++写的，用了函数。
#include<iostream>
#include<stdlib.h>
#include<time.h>
using namespace std;
void demo(void) //随机产生四则运算
{
int m, n, k; //随机数m,n,计数
m = rand() % 100;//生成随机数
n = rand() % 100;
k = rand() % 4;
switch (k) //四种运算随机选择
{
case 0:cout << m << "＋" << n << "＝" << endl; break;
case 1:cout << m << "—" << n << "＝" << endl; break;
case 2:cout << m << "×" << n << "＝" << endl; break;
case 3:cout << m << "÷" << n << "＝" << endl; break;
}
}
int main() //主函数用于循环次数
{
int i = 1; //循环次数
srand((unsigned)time(NULL));//为rand()函数生成不同的随机种子
cout << "30道一百以内加减乘除四则运算题:" << endl;
while (i <= 30)
{
demo(); //调用函数
i++;
}
return 0;
}
之后回来之后觉得太长了，一下是直接写的简短版；
#include<iostream>
#include<ctime>
using namespace std;
int main()
{
srand(time(NULL));
for (int i = 0; i < 30; i++)
{
int a, b, d; char c;
a = rand() % 100;
b = rand() % 4;
if (b == 0)
c = '+';
else if (b == 1)
c = '-';
else if (b == 2)
c = '*';
else c = '/';
d = rand() % 100;
cout << a << c << d << "=" << endl;
}
}
以下是Java版本。
import java.util.Random;
public class cheng {
public static void main(String []args)
{
int num1,num2,num3;
Random r=new Random();
String []a=new String[4];
a[0]="+";
a[1]="-";
a[2]="*";
a[3]="/";
for(int i=0;i<30;i++)
{
num1=r.nextInt(91)+10;
num2=r.nextInt(91)+10;
num3=r.nextInt(4);
System.out.println(num1+a[num3]+num2+"=");
}
}
}