C Program to Print Inverted Triangle Star Pattern

Write a C program to print the Inverted Triangle Star Pattern using for loop, while loop, and functions with an example. The below inverted program uses the nested for loops to iterate the rows and columns of a Triangle and prints stars.

#include<stdio.h>
 
int main(void)
{
    int rows;
    printf("Enter Rows to Print Inverted Triangle =  ");
    scanf("%d", &rows);
    
    for (int i = rows ; i > 0; i-- )
    {
        for (int j = 1 ; j <= rows - i; j++ )
        {
            printf("  ");
        }
        for (int k = 1 ; k <= i * 2 - 1; k++ )
        {
            printf("* ");
        }
        printf("\n");
    }
}

C Program to Print Inverted Triangle Star Pattern using while loop

In this Inverted Triangle Star Pattern program, we replaced the the C language for loop with the C programming while loop.

#include<stdio.h>
 
int main(void)
{
    int rows;
    printf("Enter Rows to Print Inverted Triangle =  ");
    scanf("%d", &rows);
    
    int i = rows ;
    while (i > 0)
    {
        int j = 1 ;
        while ( j <= rows - i )
        {
            printf("  ");
            j++;
        }
        int k = 1 ;
        while ( k <= i * 2 - 1 )
        {
            printf("* ");
            k++;
        }
        printf("\n");
        i--;
    }
}

Output

Enter Rows to Print Inverted Triangle =  8
* * * * * * * * * * * * * * * 
  * * * * * * * * * * * * * 
    * * * * * * * * * * * 
      * * * * * * * * * 
        * * * * * * * 
          * * * * * 
            * * * 
              * 

This example uses the C do while loop and prints the Inverted Triangle Stars pattern. For more star pattern examples, please refer to the C Star Pattern Programs article.

#include<stdio.h>
 
int main(void)
{
    int rows;
    printf("Enter Rows to Print Inverted Triangle =  ");
    scanf("%d", &rows);
    
    int i = rows ;
    do
    {
        int j = 0 ;
        do
        {
            printf("  ");
            j++;
        } while ( j <= rows - i );
        int k = 1 ;
        do
        {
            printf("* ");
            k++;
        } while ( k <= i * 2 - 1 );
        printf("\n");
        i--;
    } while (i > 0);
}

Output

Enter Rows to Print Inverted Triangle =  12
  * * * * * * * * * * * * * * * * * * * * * * * 
    * * * * * * * * * * * * * * * * * * * * * 
      * * * * * * * * * * * * * * * * * * * 
        * * * * * * * * * * * * * * * * * 
          * * * * * * * * * * * * * * * 
            * * * * * * * * * * * * * 
              * * * * * * * * * * * 
                * * * * * * * * * 
                  * * * * * * * 
                    * * * * * 
                      * * * 
                        * 

In the below Inverted Triangle pattern of the Stars program, the loopLogic function accepts the rows and characters to print the pattern using the symbol. Refer to the C programs article.

#include<stdio.h>

void loopLogic(int rows, char ch)
{
    for (int i = rows ; i > 0; i-- )
    {
        for (int j = 1 ; j <= rows - i; j++ )
        {
            printf("  ");
        }
        for (int k = 1 ; k <= i * 2 - 1; k++ )
        {
            printf("%c ", ch);
        }
        printf("\n");
    }
}

int main(void)
{
    int rows;
    char ch;
    
    printf("Enter Character = ");
    scanf("%c", &ch);
    
    printf("Enter Rows to Print Inverted Triangle =  ");
    scanf("%d", &rows);
    
    loopLogic(rows, ch);
}

Output

Enter Character = $
Enter Rows to Print Inverted Triangle =  16
$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ 
  $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ 
    $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ 
      $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ 
        $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ 
          $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ 
            $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ 
              $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ 
                $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ 
                  $ $ $ $ $ $ $ $ $ $ $ $ $ 
                    $ $ $ $ $ $ $ $ $ $ $ 
                      $ $ $ $ $ $ $ $ $ 
                        $ $ $ $ $ $ $ 
                          $ $ $ $ $ 
                            $ $ $ 
                              $ 

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