demostruct1.cpp

Code

/*
 *   demostruct1.cpp
 *   demonstration usage of struct
 *   CIS 250
 *   David Klick
 *   2005-01-24
 *
 */

#include <cstring>
#include <iostream>
#include <iomanip>
using std::strcpy;

struct emptype {
    char lastname[15];
    unsigned long id;
    double rate;
};

void printemp(emptype e);
void change1(emptype e);
void change2(emptype& e);


int main(void) {
    emptype emp1, emp2;

    // set members of emp1 and display
    strcpy(emp1.lastname, "Jackson");
    emp1.id = 123456;
    emp1.rate = 27.50;
    printemp(emp1);

    // use assignment operator
    emp2 = emp1;
    printemp(emp2);

    change1(emp1);
    printemp(emp1);

    change2(emp1);
    printemp(emp1);

    return 0;
}

void printemp(emptype e) {
    using std::cout;
    using std::endl;
    using std::setw;
    using std::setfill;
    using std::showpoint;
    using std::setprecision;
    using std::setiosflags;
    using std::ios;
    using std::fixed;

    cout << setw(15) << e.lastname << "  ID=" << setfill('0')
        << setiosflags(ios::fixed | ios::scientific)
        << setprecision(6) << setw(6) << e.id << setfill(' ')
        << "  rate=$" << setw(6) << fixed << showpoint
        << setprecision(2) << e.rate << endl;
}

void change1(emptype e) {
    e.id = 27;
}

void change2(emptype& e) {
    e.id = 42;
}

/*
    Sample output:

        Jackson  ID=123456  rate=$ 27.50
        Jackson  ID=123456  rate=$ 27.50
        Jackson  ID=123456  rate=$ 27.50
        Jackson  ID=000042  rate=$ 27.50
*/