C program to print diamond star pattern

 

#include <stdio.h>

int main()
{
    int x = 0,y = 0;
    unsigned int rows = 0;
    unsigned int star = 0;
    unsigned int space = 0;


    printf("Enter the number of rows = ");
    scanf("%u",&rows);

    space = (rows - 1);

    for(x=1; x < (rows*2) ; ++x)
    {
        // Print spaces
        for(y=0; y < space; ++y)
        {
            printf(" ");
        }
        // Print star
        for(y=0; y <= (star*2); ++y)
        {
            printf("*");
        }
        // Print new line
        printf("\n");

        if(x<rows)
        {
            ++star;
            --space;
        }
        else
        {
            ++space;
            --star;
        }

    }
    return 0;
}

Output: