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//program to create a function that returns area of circle based on radius passed to function as argument #include<iostream.h> #include<conio.h> float area(int); float area(int radius) { float ar; ar=3.14*radius*radius; return ar; } void main() { int r; float ar; clrscr(); cout<<"enter the radius of the circle"; cin>>r; ar=area(r); cout<<"area of circle is "<<ar; getch(); }