Question

wap to find out area of the circle and ask the user to
enter its radius and
assign a variable of pi

​

Answer 1

Answer:

int circle_radius;

  float PI_VALUE=3.14, circle_area, circle_circumf;

  //Ask user to enter the radius of circle

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

  //Storing the user input into variable circle_radius

  scanf("%d",&circle_radius);

  //Calculate and display Area

  circle_area = PI_VALUE * circle_radius * circle_radius;

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

  //Caluclate and display Circumference

  circle_circumf = 2 * PI_VALUE * circle_radius;

  printf("\nCircumference of circle is: %f",circle_circumf);

  return(0);

}

Output:

Enter radius of circle: 2

Area of circle is: 12.560000

Circumference of circle is: 12.560000

If you want more accurate results then take PI value as 22/7 instead of 3.14, it would give you the exact values of area and circumference.

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Comments

Tumelo says

MARCH 22, 2016 AT 5:30 PM

can you guys help me out here.

write a console program that calculate the area a and circuference c of the circle

a= p x r2

c=2 x p x r

you can send it on my email please.

Explanation:

Answer 2

Answer:

java

import java.util.*;

Explanation:

Scanner s = new Scanner(System.in);

float pi = 22/7f;

System.out.println("enter radius");

float r = s.nextInt();

System.out.println("area of circle" + " " + pi * r * r);