program in c++ source code:

Program:

#include <iostream>
//iostream is a header file of
standard input output function.
using namespace std;
 int main()
 // Th execution of program start with the main function
 {
 int i, j, k;
 cout << "Enter number of rows: ";
// cout is used to display the same statemnet in the output.
 cin >> k; // Cin used to enter a value by the user.
 for(i = k; i >= 1; i--) // Nested For Loop ,
 //This is the outer for loop represent the number of rows.
 {
 for(j = 1; j <= i; j++)
//This is the inner for loop represent the number of columns.
 {
 cout << "* ";
 }
 // ending line after each row
 cout << "\n";
 }
 return 0;
 }
OUTPUT:

OUTPUT: