Learn about **C Program to Find the Area of a Circle Using Functions** in the below code example. Also refer the comments in the code snippet to get a detailed view about what’s actually happening.

Contents

#### C Program to Find the Area of a Circle Using Functions

**Program:**

```
#include<stdio.h>
float circleArea(float r);
int main()
{
float radius, area;
printf("Enter the radius of the circle: ");
scanf("%f", &radius);
area = circleArea(radius);
printf("Area of circle = %.2f\n",area);
return 0;
}
// function
float circleArea(float r)
{
float area = 3.14 * r * r;
return area;
}
```

**Output:**

Enter the radius of the circle: 5

Area of circle = 78.50

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