13. Write a program in c language to print the pattern of a diamond using a for loop.

Pattern problems in c programming are one of the most common problems faced by programmers. This tutorial article includes diamond pattern problem in C language with approach, algorithm and related codes.
Problem Description Write a C program that prints a diamond pattern given the number of rows as input.

Problem Solution
1.Take the row number as input.
2.Save the number in variable.
3.In the loop, print a space and then a star.
4.Repeat this process until their number reaches 0.
5.stop.



    *
   ***
  *****
 *******
*********
 *******
  *****
   ***
    *

The program code in C to show diamond pattern using for loop

/*
* Program to show Diamond Pattern using For Loop in c
*/
#include<stdio.h>


int main()
{
    int number, i, k, count = 1;
 
    printf("Enter number of rows: \n");
    scanf("%d", &number);
    count = number - 1;
    for (k = 1; k <= number; k++)
    {
        for (i = 1; i <= count; i++)
            printf(" ");
        count--;
        for (i = 1; i <= 2 * k - 1; i++)
            printf("*");
        printf("\n");
     }
     count = 1;
     for (k = 1; k <= number - 1; k++)
     {
         for (i = 1; i <= count; i++)
             printf(" ");
         count++;
         for (i = 1 ; i <= 2 *(number - k)-  1; i++)
             printf("*");
         printf("\n");
      }

return(0);
}

a program in c language to print the pattern of a diamond using a for loop.

Explanation
1. Take number of rows as input and store it in variable number.
2. First, reduce the variable number by 1 and put this value in count variables.
3. Use count variable as terminator in for loop to show “ “.
4. Reduce the of count variable by 1.
5. Use another loop to start from 1 to (2*k-1) to display "*".
6. Perform steps 3, 4, and 5 within the for loop, starting from 1 up to the variable number.
7. Steps 2 to 6 are used to print half of the diamond.
8. For the next half, variable count is assigned by 1.
9. Use this count variables as a terminator in the for loop for printing “ “.
10. Increase the count variable by 1.
11. Use another loop to start from 1 to (2*(number-k)-1) to show "*".
12. Perform steps 8 to 11 inside a for loop from 1 to value (number 1).

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