Star Rectangle with minimum Variables

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

void main()
{
    int row, col, c;

    printf("This is a simple program to print a rectangle star pattern using while loop.\n\n");
    printf("Enter number of rows : ");
    scanf("%d", &row);
    printf("Enter number of columns : ");
    scanf("%d", &col);

    c = col;

    while(row > 0)
    {
        col = c;
        while(col > 0)
        {
            printf("*");
            col--;
        }
        printf("\n");
        row--;
    }
}