C :

int main(){ 
	int n,i,j,z;
	scanf("%d",&n);
	//控制输出的行数 
	for(i = 1;i <= n;i++){
		//控制每行输出空格量 
		for(j = 0;j < n - i;j++){
			printf(" "); 
		}
		//控住输出的*
		for(z=1;z <= 2 * i + 1;z++){
			printf("*");
		} 
		//负责换行 
		printf("\n");
	}

} 

C++ :

#include<iostream>
using namespace std;
int main(){ 
   int i,j,k,n;
   cin>>n;
   for(i = 1;i <= n;i++)
   { 
          for(j = 1;j <= n - i;j++)
          { 
    cout<<" ";
 }
 for(k = 1;k <= 2 * i + 1;k++)
 { 
    cout<<"*";
 }
 cout<<endl;
   }
   return 0; 
}   

Python :

n = int(input());
for i in range(1, n + 1):
    for k in range(1, n -i + 1):
        print(' ',end = '')
    for x in range(1, 2 * i +2):
        print('*', end = '')
    print()