C++ examples for Function:Function Parameter
Read radius of a circle, calls function circleArea to calculate the area of that circle.
#include <iomanip> #include <iostream> double circleArea(double); const double PI = 3.14159; int main(int argc, const char *argv[]) { double radius; std::cout << "Enter circle radius: "; std::cin >> radius;/*from w ww. ja v a 2s .c o m*/ std::cout << std::fixed << std::setprecision(2) << "Area: " << circleArea(radius) << std::endl; return 0; } // returns the area of a circle from the given radius double circleArea(double r) { return PI * (r * r); }