C Program to Write a menu driven program which has following options - IProgramX

Program

#include<stdio.h>
int main()
{
int ch;
float radius, area,ci,volume;
printf("1.area of circle\n2.circumference of circle\n3.volume of sphere\n");
printf("enter your choice : ");
scanf("%d",&ch);
switch(ch)
{
case 1:  
              printf("\nEnter the radius of Circle : ");
              scanf("%f", &radius);
              area = 3.14 * radius * radius;
              printf("\nArea of Circle : %f", area);
break;
case 2:
              printf("\nEnter the radius of Circle : ");
              scanf("%f", &radius);
  ci = 2 * 3.14 * radius;
              printf("\nCircumference : %f ", ci);
break;
case 3:
  printf("Enter radius of the sphere : \n");
              scanf("%f", &radius);
              volume = (4.0/3) * (3.14) * radius * radius * radius;
              printf("\n Volume of sphere is : %f", volume);
break;
    default: printf ("\n Invalid entry");
}
   
}

Output:

1.area of circle
2.circumference of circle
3.volume of sphere
enter your choice : 2

Enter the radius of Circle : 6

Circumference : 37.680000