c++作业4

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项目一:

#include<iostream>using namespace std;int main(){int i,sum=0;for(i=1;i<=1000;i++){if(i%2==0)sum=sum+i;}cout<<"1000以内的偶数和是"<<sum<<endl;return 0;}

#include<iostream>using namespace std;int main(){int i=0,sum=0;while(i<=1000){  i=i++;if(i%2==0)sum=sum+i;}cout<<"1000以内的偶数和是"<<sum<<endl;return 0;}

#include<iostream>using namespace std;int main(){int i=0,sum=0;do{i++;if(i%2==0)sum=sum+i;}while(i<1000);cout<<"1000以内的偶数和是"<<sum<<endl;return 0;}

项目六:星型符号

#include<iostream>  using namespace std;  int main()  {  int a,b;for(b=1;b<=5;b++)cout<<" ";cout<<"*\n";for(a=2;a<=5;a++){for(b=1;b<=6-a;b++)cout<<" ";cout<<"*";for(b=1;b<=2*(a-1)-1;b++)cout<<" ";cout<<"*\n";}for(b=1;b<=11;b++)cout<<"*";cout<<endl;return 0;}

项目三:乘法口诀

#include<iostream>  using namespace std;  int main()  {  int a,b,product;for(a=1;a<=9;a++){   for(b=1;b<=a;b++){product=a*b;cout<<a<<"*"<<b<<"="<<product<<" \t";}cout<<endl;}return 0;}

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