Question

Q2: Write a menu-driven C program using switch-case to calculate the following: 1. Area of circle 2. Area of square 3. Area of rectangle The program should use the following functions properly: void displayMenu() //a function that will display the menu options to the user int getChoice() //a function that will input the user choice and returns it float calculate(int choice) //a function that reads the required inputs based on the user choice, and returns the area of the shape as a float, it should return a sentinel value of -1 if the choice is invalid (out of the range 1-3)

Answer 1

C Program

#include<stdio.h> // function declaration void displayMenu(); int getChoice(); float calculate(int choice); int main() {    int choice;    displayMenu();    choice = getChoice();    float area = calculate(choice);    if(area == -1)        printf("Invalid Choice! Choice must be in range 1 to 3.\n");       else        printf("Area is: %.2f sq units", area); } // function to print the menu options void displayMenu() {    printf("Enter the option from the Menu below.\n");    printf("------------------------------------\n");    printf("1. To calculate Area of circle\n");    printf("2. To calculate Area of square\n");    printf("3. To calculate Area of rectangle\n");    printf("Enter your choice -> "); } // function to input the choice option and return it int getChoice() {    int choice;    scanf("%d", &choice);    return choice; } // function to calculate the area float calculate(int choice) {    // pi constant    const float PI = 3.14159265;    float radius, side;    float length, width;    float area;       // switch - case statements to decide on the option    // selected    switch(choice)    {        case 1: printf("Enter the radius of circle: ");               scanf("%f", &radius);               area = PI * radius * radius;             return area;         case 2: printf("Enter the side length: ");                scanf("%f", &side);                area = side * side;                return area;     case 3: printf("Enter the length of the rectangle: ");            scanf("%f", &length);            printf("Enter the width of the rectangle: ");            scanf("%f", &width);            area = length * width;            return area;        default: return -1;    } }

OUTPUT