Example: Calculate Weight from Mass in C

C
C++
C#
Java
Python
PHP
// Calculate Weight from Mass
#include <stdio.h>

#define GRAVITY_EARTH 9.81 // Acceleration due to gravity on Earth in m/s^2

int main() {
    float mass;
    float weight;

    // Step 1: Prompt user for mass input
    printf("Please enter the object's mass in kilograms (kg): ");
    
    // Step 2: Read mass from user with basic validation
    if (scanf("%f", &mass) != 1 || mass < 0) {
        printf("Invalid input. Please enter a non-negative number for mass.\n");
        return 1; // Indicate an error
    }

    // Step 3: Calculate weight using the formula W = m * g
    weight = mass * GRAVITY_EARTH;

    // Step 4: Display the calculated mass and weight
    printf("The mass of the object is: %.2f kg\n", mass);
    printf("The weight of the object on Earth is: %.2f N\n", weight);

    return 0;
}