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//program to create two functions to calculate area and circumference of circle and call them based on user choice using switch statement #include<stdio.h> #include<conio.h> void area(int); void circumference(int); void area(int radius) { float ar; ar=3.14*radius*radius; printf("area of circle is %f",ar); } void circumference(int radius) { float cir; cir=2*3.14*radius; printf("circumference of circle is %f",cir); } void main() { int r; int ch; clrscr(); printf("enter radius of circle"); scanf("%d",&r); printf("enter your choice (1 for area and 2 for circumference"); scanf("%d",&ch); switch(ch) { case 1:area(r); break; case 2:circumference(r); break; default: printf("enter 1 or 2 as choice"); } getch(); }