题解 | 空心正方形图案

#include <stdio.h>

int main() {
    int row, column = 0;
    int i = 0;
    while (scanf("%d", &row) != EOF) {
        for (i = 1; i <= row; i++) {
            for (column = 1; column <= row; column++) {
                if (i == 1 || i == row) {
                    printf("* ");
                }
                else if (column == 1 || column == row) {
                    printf("* ");
                }
                else {
                    printf("  ");
                }
            }
            printf("\n");
        }
    }
    return 0;
}