c++上机作业4

#include<iostream.h>
void main()
{
int x,y,z;
cout<<"翁，母，雏的数量："<<endl;
for(x=0;x<=20;x++)
for(y=0;y<=33;y++)
for(z=0;z<=300;z++)
{
if(x+y+z==100&&5*x+3*y+z/3==100)
cout<<"鸡翁"<<x<<"只，鸡母"<<y<<"只，鸡雏"<<z<<"只"<<endl;
}
}

#include <iostream>
using namespace std;
int main( )
{
int i,j;
cout<<" 乘法口诀表"<<endl;
for(i=1;i<=9;i++)
{
for(j=1;j<=i;j++)
cout<<i<<"×"<<j<<"="<<i*j<<"  ";
cout<<endl;
}
return 0;
}

#include<iostream>

using namespace std;

int main()

{

int sum=0,i=2;

for (i=2; i<=1000; i=i+2)

sum=sum+i ;//sum+=i

cout<<"1000以内所有偶数的和是"<<sum<<endl;

return 0;

}

#include<iostream>

using namespace std;

int main( )

{

int sum=0,i=2;

while (i<=1000)

{

sum=sum+i;//即为sum+=i

i=i+2;//即为i+=2

}

cout<<"1000以内所有偶数的和是"<<sum<<endl;

return 0;

}

#include<iostream>

using namespace std;

int main( )

{

int sum=0,i=2;

do

{

sum=sum+i;//即为sum+=i

i=i+2; //即为i+=2

}

while(i<=1000);

cout<<"1000以内所有偶数的和是"<<sum<<endl;

return 0;

}