C program to reverse triangle number patterns using while loop

In this tutorial, we will discuss the concept of C program to reverse triangle number patterns using while loop

In C language, we can use for loop, while loop, do-while loop to display various number, star, alphabet and binary number patterns

In this topic, we demonstrate how to display some reversed number patterns using the nested while loop in C language.

Pattern 1

C program to reverse triangle number patterns using while loop — Reverse number pattern 1

Reverse triangle number pattern 1

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int j,rows;//variable declaration
    printf("Enter the number of rows:\n ");
    scanf("%d",&rows);//take input from user
    printf("\n");

    while(rows>=1){//outer while loop
        int j=rows;
        while(j>=1){//inner while loop
            printf("%d",j);//Display pattern
            j--;
        }
        rows--;
    printf("\n");//move to next line
    }
    getch();
    return 0;
}

When the above code is executed, it produces the following results

Enter the number of rows:
8

87654321
7654321
654321
54321
4321
321
21
1

Pattern 2

Reverse triangle number pattern 2

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int j,rows;//variable declaration
    printf("Enter the number of rows: ");
    scanf("%d",&rows);
    printf("\n");
int i;
    while(rows>=0){
        for(i=1; i<=rows; i++){
            printf("%d",rows);
        }
        rows--;
    printf("\n");
    }
    getch();
    return 0;
}

When the above code is executed, it produces the following results

Enter the number of rows: 8

88888888
7777777
666666
55555
4444
333
22
1

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