第四次c++作业——代码篇

<span style="color: rgb(51, 51, 51); font-family: Arial; font-size: 14px; line-height: 26px;">项目2-分数的累加</span>

#include<iostream.h>
int main()
{
double a,b,c;
b=0;
c=-1;
for(a=1;a<20;a=a+2)
{	c=-c;
b=(a*c)/(a+2)+b;
}
cout<<b<<endl;
}

#include<iostream.h>
int main()
{
int a,b;
for(a=1;a<=9;a++)
{
for(b=1;b<=9;b++)
if(b<=a)
cout<<a<<"*"<<b<<"="<<a*b<<" ";
cout<<endl;
}
cout<<endl;
return 0;
}

#include<iostream.h>
int main()
{
int a,b,c;
for(a=0;a<=6;a++)
{
for(b=0;b<=3;b=b+1)
{
c=8-a-b;
if(c>=0&&c<=3)
cout<<"黑球个数为："<<a<<" 红球个数为："<<b<<" 白球个数为："<<c<<endl;
}
}
cout<<endl;
}