C Program to Print Diamond Number Pattern

Write a C program to print a Diamond number pattern using for loop, while loop, and functions with an example. In the below program, we used multiple nested for loops to iterate the rows and print the numbers in a diamond shape or pattern.

#include<stdio.h>
int main(void)
{
     int i, j, k, rows;
     printf("Enter Diamond Number Rows =  ");
     scanf("%d", &rows);

    for(i = 1; i <= rows; i++)
    {
        for(j = 1; j <= rows - i; j++)
        {
            printf(" ");
        }
        for(k = 1; k <= i * 2 - 1; k++)
        {
            printf("%d", k);
        }
        printf("\n");
    }

    for(i = rows - 1; i > 0; i--)
    {
        for(j = 1; j <= rows - i; j++)
        {
            printf(" ");
        }
        for(k = 1; k <= i * 2 - 1; k++)
        {
            printf("%d", k);
        }
        printf("\n");
    }
}

C Program to Print Diamond Number Pattern using for loop

It is another way of writing a program to display the diamond pattern of numbers using a for loop.

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

Enter Diamond Number Rows =  9
        1
       212
      32123
     4321234
    543212345
   65432123456
  7654321234567
 876543212345678
98765432123456789
 876543212345678
  7654321234567
   65432123456
    543212345
     4321234
      32123
       212
        1

The below c program uses a while loop to print the diamond pattern of numbers using the above code.

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

Enter Diamond Number Rows =  7
      1
     212
    32123
   4321234
  543212345
 65432123456
7654321234567
 65432123456
  543212345
   4321234
    32123
     212
      1