#include <stdio.h>
 
int main() {
    int side;
    float area, perimeter;
 
    printf("Enter side length: ");
    scanf("%d", &side);
 
    // ตรวจสอบว่าค่าที่กรอกเป็นค่าบวกหรือไม่
    if(side <= 0) {
        printf("Side length must be greater than zero.\n");
    } else {
        // คำนวณพื้นที่และเส้นรอบวง
        area = side * side;
        perimeter = 4 * side;
 
        printf("Area = %.3f\n", area);
        printf("Perimeter = %.3f\n", perimeter);
    }
 
    return 0;
}

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