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Template for your first OO classes
Defining and using classes in C++ example from a Well House Consultants training course
More on Defining and using classes in C++ [link]
Source code: hellosurvey.cpp Module: C232
// Template for your first OO classes
#include <iostream> // Define the API ("Application Programmer Interface") between the class // of data that the expert will write and the test program or user class SurveyResponse { public: SurveyResponse(int,int,const char *); int getReason(); bool isitWalkingHome(); // The following would most likely be "private" to stop direct access later int reason; /* Reason for travel */ int how; /* How from station to final destination */ const char * destiny; /* Destination station */ }; /* --------- Above here - the header information ------------ Below here - the details of how to handle a piece of data */ // How to build a SurveyResponse object - the "constructor" SurveyResponse::SurveyResponse(int h,int r,const char * which_tlc) { reason = r; how = h; destiny = which_tlc; } // A couple of methods which get data / properties / results back out // This is the secret working that the expert only knows about! int SurveyResponse::getReason() { return reason; }; bool SurveyResponse::isitWalkingHome() { bool rv = false; if (reason == 1 && how == 7) rv = true; return rv; }; /* --------- Above here - the details of how to handle a piece of data ------------ Below here - the test program */ // A test program - no detailed logic of how survey responses work in here, please! // For a TEST program, I usually create two objects to make sure I'm handing the // data for each object separately and it's not getting mixed up. int main () { std::cout << "Testing our new little class" << std::endl; std::cout << "Write a test case first ..." << std::endl; // Pass in the data in a way we have been told by the chap who wrote the class SurveyResponse first = SurveyResponse(2,6,"SWI"); SurveyResponse second = SurveyResponse(7,1,"MKM"); // And get the resuls back out - no need to know what algoriths are used int rv1 = first.getReason(); int rv2 = second.getReason(); bool homeing1 = first.isitWalkingHome(); bool homeing2 = second.isitWalkingHome(); std::cout << "The first reason for travel was " << rv1 << std::endl; std::cout << "The second reason for travel was " << rv2 << std::endl; if (homeing1) std::cout << "First person is walking home" << std::endl; if (homeing2) std::cout << "Second person is walking home" << std::endl; } /* ---------------------------- Sample Output munchkin:cpp_dec14 grahamellis$ ./hellosurvey Testing our new little class Write a test case first ... The first reason for travel was 6 The second reason for travel was 1 Second person is walking home munchkin:cpp_dec14 grahamellis$ */ Learn about this subject
This module and example are covered on the following public courses:
* Learning to program in C and C++ * C++ for C Programmers * C and C++ Programming * Learning to program in C and C++ * C and C++ Programming Also available on on site courses for larger groups Books covering this topic
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