C program to calculate and print area and circumference of a circle

Problem In Hand

C Program to calculate and print area and circumference of circle

The above program can be solved in following ways:

Without using function
Using functions with out passing arguments
Using function by passing arguments

 

Process and Solution Of Problem

Take input for radius of rectangle and store in variables
calculate and store area of circle in a variable.
calculate and store circumference of circle in another variable.
further display area and circumference

Program/Source Code

Solution without functions

#include <stdio.h>
#define pi 3.1415
int main()
{
    float r,a,c;
    printf("Enter radius of circle ");
    scanf("%f",&r);
    a=pi*r*r;
    c=2*pi*r;
    printf("Area = %f\n",a);
    printf("Circumference = %f\n",c);

    return 0;
}

Output:

case 1:

Enter radius of circle 2.3
Area = 16.618534
Circumference = 14.450900

case 2:

Enter radius of circle 5.2
Area = 84.946152
Circumference = 32.671600

Solution using functions without arguments

#include <stdio.h>
#define pi 3.1415
void circle()
{
    float r,a,c;
    printf("Enter radius of circle ");
    scanf("%f",&r);
    a=pi*r*r;
    c=2*pi*r;
    printf("Area = %f\n",a);
    printf("Circumference = %f\n",c);
}
int main()
{
    circle();
    return 0;
}

Output:

Enter radius of circle 25.3
Area = 2010.842651
Circumference = 158.959900

Solution using functions with arguments

#include <stdio.h>
#define pi 3.1415
void circle(float r)
{
    float a,c;
    a=pi*r*r;
    c=2*pi*r;
    printf("Area = %f\n",a);
    printf("Circumference = %f\n",c);
}
int main()
{
    float r;
    printf("Enter radius of circle ");
    scanf("%f",&r);
    circle(r);
    return 0;
}

Output:

Enter radius of circle 14.3
Area = 642.405334
Circumference = 89.846901

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