Question

Homework 4 – Create your own Function Create your own function in C that accepts one input number and returns a double number. The themes for the functions should be one of the following:  Calculates 3.14 times of the square of input number. For example, if 2 is input then 12.56 should be returned. (e.g. 3.14*2*2 = 12.56)  Divides the number by 3 and returns the result. For example, if 6 was input then 2.0 should be returned.  Squares the number and returns the result. For example, if 12.1 was entered then 146.41 would be returned. You should provide both your C code and an example call to the C code function. Be sure to provide an overview of what your function is doing. Include header documentation in the code as well as internal code documentation. Provide a screen capture showing the results of testing your code in an online compiler. Be sure to test your code with several test cases and show your test case table.

Answer 1

Program

#include<stdio.h>

//function prototypes
double getArea(double rad);
double divByThree(double n);
double square(double n);

//main function
int main()
{
//variable declaration
double rad, m, n;

/*** Testing ***/
printf("*** Testing ***\n");
rad = 2;
n = getArea(rad);
printf("Area of the circle is %.2f\n", n);

n = 6;
m = divByThree(n);
printf("%.2f divide by three is %.2f\n", n, m);

n = 12.1;
m = square(n);
printf("Square of %.2f is %.2f\n", n, m);

/**** user input ***/
printf("\n\n*** User input ***\n");

printf("Enter the radius: ");
scanf("%lf", &rad);
n = getArea(rad);
printf("Area of the circle is %.2f\n", n);

printf("Enter a number: ");
scanf("%lf", &n);
m = divByThree(n);
printf("%.2f divide by three is %.2f\n", n, m);

printf("Enter a number: ");
scanf("%lf", &n);
m = square(n);
printf("Square of %.2f is %.2f\n", n, m);

return 0;
}

//function to return the area of circle
double getArea(double rad)
{
double area = 3.14*rad*rad;
return area;
}

//function to divides the number by 3 and returns the result
double divByThree(double n)
{
double d = n/3;
return d;
}

//function to square the number and returns the result
double square(double n)
{
double d = n * n;
return d;
}

Output:

*** Testing ***
Area of the circle is 12.56
6.00 divide by three is 2.00
Square of 12.10 is 146.41

*** User input ***
Enter the radius: 10
Area of the circle is 314.00
Enter a number: 30
30.00 divide by three is 10.00
Enter a number: 20
Square of 20.00 is 400.00