Tutorial Gateway

C Program to Print Right Angled Triangle Star Pattern

by

How to write a C Program to Print Right Angled Triangle Star Pattern with example?. And also show you how to print the Right Angled Triangle Pattern with different symbols.

C Program to Print Right Angled Triangle Star Pattern

This C program allows the user to enter the maximum number of rows he/she want to print as a Right Angled Triangle. We are going to print the Right Angled Triangle of * symbols until it reaches the user-specified rows.

/* C Program to Print Right Angled Triangle Star Pattern */
#include <stdio.h>
 
int main() 
{
  int Rows, i, j;
	
  printf("Please Enter the Number of Rows:  ");
  scanf("%d", &Rows);
	
  printf("\nPrinting Right Angled Triangle \n \n");
  for ( i = 1 ; i <= Rows; i++ ) 
  {
      for ( j = 1 ; j <= i; j++ ) 
      {
          printf("* ");
      }
      printf("\n");
  }
  return 0;
}

OUTPUT

C Program to Print Right Angled Triangle Star Pattern 1

ANALYSIS
Let us see the Nested for loop

for ( i = 1 ; i <= Rows; i++ ) 
{
   for ( j = 1 ; j <= i; j++ ) 
   {
       printf("* ");
   }
   printf("\n");
}

Outer Loop – First Iteration

From the above screenshot, you can see the value of i is 1 and Rows is 7 so, the C Programming condition (i <= 7) is True. So, it will enter into second for loop

Inner Loop – First Iteration
The j value is 1 and the condition (j <= 1) is True. So, it will start executing the statements inside the loop. The following statement will print * as Output

printf("* ");

The following statement will increment the Value of Number by 1 using the Increment Operator

j++

It will happen until the condition inside the inner for loop fails. Next, iteration will start from the beginning until both the Inner Loop and Outer loop conditions fail.

C Program to display Right Angled Triangle Star Pattern

This program allows the user to enter the Symbol and number of rows he/she want to print.

/* C Program to Print Right Angled Triangle Star Pattern */
#include <stdio.h>
 
int main() 
{
  int Rows, i, j;
  char Ch;
  
  printf("Please Enter any Symbol\n");
  scanf("%c", &Ch);	
  
  printf("Please Enter the Number of Rows:  ");
  scanf("%d", &Rows);
	
  printf("\nPrinting Right Angled Triangle \n \n");
  for ( i = 1 ; i <= Rows; i++ )
  {
    for ( j = 1 ; j <= i; j++ )
    {
       printf("%c", Ch);
    }
    printf("\n");
  } 
  return 0;
}

OUTPUT

C Program to Print Right Angled Triangle Star Pattern 2

C Program to display Right Angled Triangle Star Pattern using While Loop

In this C program to return the right angled triangle star pattern, we just replaced the For Loop with the While Loop. I suggest you refer While Loop article to understand the logic.

/* C Program to Print Right Angled Triangle Pattern */
#include <stdio.h>
 
int main() 
{
  int Rows, i = 1, j;
  char Ch;
  
  printf("Please Enter any Symbol\n");
  scanf("%c", &Ch);	
  
  printf("Please Enter the Number of Rows:  ");
  scanf("%d", &Rows);
	
  printf("\nPrinting Right Angled Triangle \n \n");
  while ( i <= Rows)
  {
     for ( j = 1 ; j <= i; j++ )
     {
  	printf("%c", Ch);
     }
     printf("\n");
     i++;
  } 
  return 0;
}

OUTPUT

C Program to Print Right Angled Triangle Star Pattern 3