Print Triangle Pattern of Numbers using C, C++ Program

Write a C,C++ program to print the triangle pattern of numbers. In this program we take number as a input from user and print the triangle pattern.


Let's say if user input number 6. Then we print pattern like this.

Program to calculate sum of n numbers.

Triangle of Numbers.

1  2  3  4  5  6
1  2  3  4  5
1  2  3  4
1  2  3
1  2
1

Steps to Print Triangle Pattern of Numbers

i) Take a number input from user.

ii) Use two for loops. 

   

   /* Initialize i=input number, as we printing triangle in reverse order. */
   for(i=n;i>=1;i--)
   { 
     /* For every i, print j from 1 to i.*/
     for(j=1;j<=i;j++)
     {
        printf("%d ",j);
     }
       printf("\n ");
   }

C Program to Print Triangle Pattern of Numbers

#include<stdio.h>

int main() {
 
  int i,j,n;

  /* Taking input from user. */
 
   printf("Enter a number \n ");
   scanf("%d",&n);

   for(i=n;i>=1;i--)
   {
     for(j=1;j<=i;j++)
     {
        printf("%d ",j);
     }
       printf("\n ");
   }

    return 0;
}

Output :

Enter a numer : 7

 1 2 3 4 5 6 7 
 1 2 3 4 5 6 
 1 2 3 4 5 
 1 2 3 4 
 1 2 3 
 1 2 
 1 

C++ Program to Print Triangle Pattern of Numbers

#include <iostream>
using namespace std;

int main() {
 
    int i,j,n;

    /* Taking input from user. */
 
    cout << "Enter a number \n ";
    cin >> n;

    for(i=n;i>=1;i--)
    {
      for(j=1;j<=i;j++)
      {
        cout << j;
      }
       cout << "\n ";
    }

    return 0;
}

Output :

Enter a numer : 8

 1 2 3 4 5 6 7 8 
 1 2 3 4 5 6 7 
 1 2 3 4 5 6 
 1 2 3 4 5 
 1 2 3 4 
 1 2 3 
 1 2 
 1 

Program to reverse an array.

Program to print even numbers from 1 to 100.

C, C++ Programming interview questions.