C Program To Find Area and Circumference of Circle

C Program To Find Area and Circumference of Circle

Algorithm

• Program Start
• Declare Variables
• Input Radius From the User
• Calculate Area of Circle
• Calculate Circumference of circle
• Print area of circle
• Print circumference of circle
• Program End

Program

#include<stdio.h>
void main()
{
float r,aoc, coc ;
printf("Enter the radius : ");
scanf("%f",&r);

aoc=3.14*(r*r);
coc = 2*3.14*r;

printf("Area of Circle is : %f",aoc);
printf("\nCircumference of Circle is : %f",coc);

}

Output

Enter the radius : 4
Area of Circle is : 50.240002
Circumference of Circle is : 25.120001

C Program To Find Area and Circumference of Circle Using Function

Algorithm

• Program Start
• Declare Variables
• Input Radius From the User
• Calling Function to find area of circle
• Calculate Area of Circle
• Print Area of circle
• Calling Function to find circumference of circle
• Calculate Circumference of circle
• Print circumference of circle
• Program End

Program

#include<stdio.h>
void aoc(float r)
{
    float area;

    area = 3.14*(r*r);
    printf("Area of Circle is : %f",area);
}
void coc(float r)
{
    float area;

    area =2*3.14*r;

    printf("\nCircumference of Circle is : %f",area);
}
void main()
{
float r;
printf("Enter the radius : ");
scanf("%f",&r);

aoc(r);
coc(r);

}

Output

Enter the radius : 6
Area of Circle is : 113.040001
Circumference of Circle is : 37.680000

C Program To Find Area and Circumference of Circle Using Pointer

Program

#include<stdio.h>
void aoc(float *r)
{
    float area;

   //here r is a pointer variable 
    area = 3.14*(*r)*(*r);
    printf("Area of Circle is : %f",area);
}
void coc(float *r)
{
    float area;
  //here r is a pointer variable
    area =2*3.14*(*r);

    printf("\nCircumference of Circle is : %f",area);
}
void main()
{
float r;
printf("Enter the radius : ");
scanf("%f",&r);

aoc(&r);
coc(&r);

}

Output

Enter the radius : 3
Area of Circle is : 28.260000
Circumference of Circle is : 18.840000