C Exercises: Compute the area of a circle given its radius using inline function

C inline function: Exercise-1 with Solution

Write a C program to compute the area of a circle given its radius using inline functions.

Sample Solution:

C Code:

#include <stdio.h>

// Inline function to compute area of a circle
inline double circle_area(double radius) {
  return 3.14159265358979323846 * radius * radius;
}
int main() {
  double radius = 5.0;
  printf("The area of the circle (radius = %f) is %f", radius, circle_area(radius));
  radius = 12.0;
  printf("\nThe area of the circle (radius = %f) is %f", radius, circle_area(radius));
  return 0;
}

Sample Output:

The area of the circle (radius = 5.000000) is 78.539816
The area of the circle (radius = 12.000000) is 452.389342

Explanation:

The said program is an inline function that computes the area of a circle given its radius. The formula for circle area is πr², where r is the radius. In the inline function, pi is taken as a constant, and the radius is passed as an argument to the function. The function then computes the area using the formula and returns the result. Since it is an inline function, it is inserted directly into the code where it is called. This can improve performance compared to regular function calls.

Flowchart:

C Programming Code Editor:

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