c++作业4

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一、求1000以内所有偶数的和

（1）whlie语句

#include<iostream.h>void main(){long double sum=0;int i=2;while(i<=1000){if(i%2==0){sum=sum+i;}i++;}cout<<"sum="<<sum<<endl;}

（2）do-while语句

#include<iostream.h>void main(){long double sum=0;int i=2;do{if(i%2==0){sum=sum+i;}i++;}while(i<=1000);cout<<"sum="<<sum<<endl;}

(3)for语句

#include<iostream.h>void main(){double sum=0;int i;for(i=2;i<=1000;i++){if(i%2==0){sum=sum+i;}}cout<<"sum="<<sum<<endl;}

二、乘法口诀表

#include<iostream.h>          void main(){      int i,j,k;    for(i=1;i<=9;i++)  {        for(j=1;j<=i;j++)  {    k=i*j;    cout<<j<<"×"<<i<<"="<<k<<" ";         }    cout<<endl;    }         }

三、输出图形

#include<iostream.h>void main(){int i,j;for(i=1;i<=6;i++){for(j=0;j<=6-i;j++)cout<<" ";if(i>1){cout<<"*";for(j=1;j<2*(i-1);j++)if(i<6)cout<<" ";elsecout<<"*";}cout<<"*\n";         }}

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