Example: C Program to print Hollow Square Star Pattern with Diagonal using loop

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// C Program to print Hollow Square Star Pattern with Diagonal using loop
#include <stdio.h>

int main() {
    int x = 0, y = 0;
    unsigned int sS = 0;

    printf("-----Enter the side of a square-----\n");
    scanf("%u", &sS);

    printf("\n");
    for (x = 1; x <= sS; ++x) {
        for (y = 1; y <= sS; ++y) {
            // It will check boundary conditions
            // It will check diagonal and secondary diagonal conditions
            if ((x == 1) || (x == sS) || (y == 1) || (y == sS) || (x == y) || (y == (sS - x + 1)))
                printf("*");
            else
                printf(" ");
        }

        // It will print the new line
        printf("\n");
    }
    return 0;
}