Question

write a program to print to compute the circumference of a circle ​

Answer 1

Answer:

/*##Circumference Of Circle*/

/*##Calculation Programs, Datatype Programs, Basic Programs*/

#include<stdio.h>

float PI = 3.14;

int main(){

  float radius, ci;

  printf("\nEnter the radius of Circle : ");

  scanf("%f", &radius);

  ci = 2 * PI * radius;

   

  printf("\nCircumference of Circle : %f", ci);

  return (0);

}

Answer 2

Answer:

#include<stdio.h>

 

int main() {

 

  int rad;

  float PI = 3.14, area, ci;

 

  printf("\nEnter radius of circle: ");

  scanf("%d", &rad);

 

  area = PI * rad * rad;

  printf("\nArea of circle : %f ", area);

 

  ci = 2 * PI * rad;

  printf("\nCircumference : %f ", ci);

 

  return (0);

}

Output :

Enter radius of a circle : 1

Area of circle : 3.14

Circumference  : 6.28

1

2

3

Enter radius of a circle : 1

Area of circle : 3.14

Circumference  : 6.28

Explanation of Program :

In this program we have to calculate the area and circumference of the circle. We have following 2 formulas for finding circumference and area of circle.

Area of Circle = PI * R * R

1

Area of Circle = PI * R * R

and

Circumference of Circle = 2 * PI * R

1

Circumference of Circle = 2 * PI * R

In the above program we have declared the floating point variable PI whose value is defaulted to 3.14.We are accepting the radius from user.

printf("\nEnter radius of circle: ");

scanf("%d", &rad);

1

2

printf("\nEnter radius of circle: ");

scanf("%d", &rad);

Explanation:

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