Acclerated c++之打印三角形

#include <iostream>#include <string>using namespace std;int main(){cout<<"please input n subject to n=7"<<endl;int cols;cin>>cols;int n1=cols/2;int row=4;for(int i=1;i<=row;i++){   int c=0;   while(c<cols){if(i==row){  for(int k=0;k<cols;k++)cout<<"*";cout<<endl;   return 0;}   if(c==cols/2-i+1||c==cols/2+i-1)cout<<"*";   elsecout<<" ";c++;}cout<<endl;}return 0;}