| // A simple program that computes the square root of a number | |
| #include <cmath> | |
| #include <cstdlib> | |
| #include <iostream> | |
| #include <string> | |
| int main(int argc, char* argv[]) | |
| { | |
| if (argc < 2) { | |
| std::cout << "Usage: " << argv[0] << " number" << std::endl; | |
| return 1; | |
| } | |
| // convert input to double | |
| const double inputValue = atof(argv[1]); | |
| // calculate square root | |
| const double outputValue = sqrt(inputValue); | |
| std::cout << "The square root of " << inputValue << " is " << outputValue | |
| << std::endl; | |
| return 0; | |
| } |