C Program
#include<stdio.h> #include<conio.h> void main () { int ch,r,l,w,b,h; float area; clrscr(); printf("enter 1 for area of circle\n"); printf("enter 2 for area of rectangal\n"); printf("enter 3 for area of triagle\n"); printf("enter your choise\n"); scanf("%d",&ch); switch(ch) { case 1: printf("enter radious of circle\n"); scanf("%d",&r); area=3.14*r*r; break; case 2: printf("enter lanth and width\n"); scanf("%d%d",&l,&w); area=l*w; break; case 3: printf("enter the base and hight\n"); scanf("%d%d",&b,&h); area=.5*b*h; break; } printf("area is=%f",area); getch(); }