Question

Programming in C with comments/steps

1. Overview The purpose of this assignment is to give you some experience with writing functions that take in arguments and return values, as well as writing a program that consists of multiple files. This assignment also requires the use of a switch statement, in addition to more practice with printf& scanf declaring variables, using loops, and using logical expressions. For this assignment, you will prompt the user in the main function to enter their weight (in pounds). Also you will prompt the user to enter an integer corresponding to a planet (or solar body). Another function, which will reside in a separate .c file, will be called, sending those two inputs. In that function, a switch statement will be used to determine how much the person would weigh on that other planet and that result will be returned to the main function where it was called from. Then the result will be shown to the user.

Answer 1

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File1: defs.h

--------------------------------------------------------------------

#include <stdio.h>

/*

First arg: weight of the person

Second arg: choice of the planet

Return: weight on the selected planet

*/

float otherWeight(int, int);

=================================================================

File2: otherWeight.c

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#include "defs.h"

/*

First arg: weight of the person

Second arg: choice of the planet

Return: weight on the selected planet

*/

float otherWeight(int weight, int planet) {

    // Switch case

    switch(planet) {

        case 1: // for mercury

            return weight * 0.284;

            // No need of break statement as we are using return statement

        case 2: // for Venus

            return weight * 0.907;

            

        case 3: // for Mars

            return weight * 0.38;

           

        case 4: // for Jupiter

            return weight * 2.34;

           

        case 5: // for Saturn

            return weight * 0.925;

           

        case 6: // for Uranus

            return weight * 0.795;

           

        case 7: // for Neptune

            return weight * 1.125;

           

        default: // 8th case for the moon

            return weight * 0.166;

           

    }

}

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File 3: main.c

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#include "defs.h"

int main() {

    int weight, planet; // User input

    float weightOnPlanet; // variable for calculated weight on other planet

    // for printing planets names.

    char planets[8][10] = {"Mercury" ,"Venus", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune", "The Moon"};

    int choice = 0;

    printf("Enter your weight in pounds: ");

    scanf("%d", &weight);

    do { // Loop until user says go again (yes)

       

        printf("\nWhich planet do you want to see how much you would weigh on? \

                \n1: Mercury \

                \n2: Venus \

                \n3: Mars \

                \n4: Jupiter \

                \n5: Saturn \

                \n6: Uranus \

                \n7: Neptune \

                \n8: The Moon \

                \nEnter your choice: ");

        scanf("%d", &planet);

        // Call function to get the weight on other planet

        weightOnPlanet = otherWeight(weight, planet);

        //Array index start with 0. So, we use planet-1

        printf("\nOn %s, you would weigh %.2f pounds!", planets[planet-1], weightOnPlanet);

        // Loop until valid input i.e. 1 or 0

        do {

            printf("\n\nDo you want to go again? (1 for Yes, 0 for No) : ");

            scanf("%d", &choice);

           

        } while(choice != 1 && choice != 0);

    } while(choice == 1);

    return 0;

}

================================================================================

Sample Output:

HomeworkLib@SurfaceProVRS:/mnt/c/Users/sekha/OneDrive/Dev/c$ gcc main.c otherWeight.c HomeworkLib@SurfaceProVRS:/mnt/c/Users/sekha/OneDrive/Dev/c$ ./a.out Enter your weight in pounds: 125 Which planet do you want to see how much you would weigh on? 1: Mercury 2: Venus 3: Mars 4: Jupiter 5: Saturn 6: Uranus 7: Neptune 8: The Moon Enter your choice: 1 On Mercury, you would weigh 35.50 pounds! Do you want to go again? (1 for Yes, e for No) 2 Do you want to go again? (1 for Yes, e for No): 1 Which planet do you want to see how much you would weigh on? 1: Mercury 2: Venus 3: Mars 4: Jupiter 5 Saturn 6: Uranus 7: Neptune 8: The Moon Enter your choice: 2 On Venus, you would weigh 113.38 pounds! Do you want to go again? (1 for Yes, 0 for No) 0 HomeworkLib@SurfaceProVRS:/mnt/c/Users/sekha/OneDrive/Dev/c$