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//program to create two functions to calculate area and perimeter of square based on user choice #include<iostream.h> #include<conio.h> void area(int); void perimeter(int); void area(int side) { int ar; ar=side*side; cout<<"area of square is "<<ar; } void perimeter(int side) { int per; per=4*side; cout<<"perimeter of square is "<<per; } void main() { int ch; int side; clrscr(); cout<<"enter side of square"; cin>>side; cout<<"enter your choice 1 for area or 2 for perimeter"; cin>>ch; if(ch==1) { area(side); } if(ch==2) { perimeter(side); } getch(); }