overviewch5 - Engineering 101 Lecture 05 Functions Program...

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Engineering 101 Lecture 05 9/18/07 Functions
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Program: calculate weight on Mars #include <iostream> using namespace std; red = scaffolding int main( ){ double marsmass = 6.4e-23; double marsrad = 3.4e6; pink = declarations double earthweight; double marsratio; cout << “What is your weight on earth?” << endl; cin >> earthweight; yellow = operators marsratio = 6.8e-12*marsmass/(marsrad*marsrad); cout << “Weight on mars is ” << marsratio*earthweight << endl; return 0; }
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Add comments for the reader #include <iostream> // Program written by someone using namespace std; // This computes your weight int main( ){ // if you happen to be on Mars double marsmass = 6.4e-23; // The mass of Mars double marsrad = 3.4e6; // The radius of Mars double earthweight; // The weight on Earth double marsratio; // Ratio of Mars to Earth cout << “What is your weight on earth?” << endl; cin >> earthweight; // compute the weight of the person on Mars marsratio = 6.8e-12*marsmass/(marsrad*marsrad); cout << “Weight on mars is ” << marsratio*earthweight << endl; return 0; }
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#include <iostream> // Program written by someone using namespace std; // This computes your weight int main( ){ // if you happen to be on Mars or Jupiter double marsmass = 6.4e23; // The mass of Mars double marsrad = 3.4e6; // The radius of Mars double jupmass = 1.9e27; // The mass of Jupiter double juprad = 7.0e7; // The radius of Jupiter double earthweight; // The weight on Earth double marsratio, jupratio; // Ratio of Mars and Jupiter to Earth cout << “What is your weight on Earth?” << endl; cin >> earthweight; // compute the weight of the person on Mars marsratio = 6.8e-12*marsmass/(marsrad*marsrad); cout << “Weight on Mars is ” << marsratio*earthweight << endl; // compute the weight of the person on Jupiter jupratio = 6.8e-12*jupmass/(juprad*juprad); cout << “Weight on Jupiter is ” << jupratio*earthweight << endl; return 0; } Compute Weight on Jupiter too
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Functions and Procedures Functions and procedures encapsulate algorithms so they can be written once and used repeatedly, to avoid repetition in codes.
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