C :

#include<stdio.h> 


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 < i - 1;j++){
			printf(" "); 
		}
		//控住输出的*
		for(z=1;z <= n;z++){
			printf("*");
		} 
		//负责换行 
		printf("\n");
	}

} 

C++ :

#include <iostream>
using namespace std;

int main(){
    int i,n,j;
    cin>>n;
    for(i=1;i<=n;i++){
    	for(j=1;j<=i-1;j++){
    		cout<<" ";
		}
		for(j=1;j<=n;j++){
			cout<<"*";
		}
		cout<<endl;
	}
	
}

Python :

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