57 lines
1.4 KiB
C++
57 lines
1.4 KiB
C++
// strctptr.cpp -- functions with pointer to structure arguments
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#include <iostream>
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#include <cmath>
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// structure templates
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struct polar
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{
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double distance; // distance from origin
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double angle; // direction from origin
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};
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struct rect
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{
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double x; // horizontal distance from origin
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double y; // vertical distance from origin
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};
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// prototypes
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void rect_to_polar(const rect * pxy, polar * pda);
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void show_polar (const polar * pda);
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int main()
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{
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using namespace std;
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rect rplace;
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polar pplace;
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cout << "Enter the x and y values: ";
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while (cin >> rplace.x >> rplace.y)
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{
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rect_to_polar(&rplace, &pplace); // pass addresses
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show_polar(&pplace); // pass address
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cout << "Next two numbers (q to quit): ";
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}
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cout << "Done.\n";
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return 0;
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}
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// show polar coordinates, converting angle to degrees
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void show_polar (const polar * pda)
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{
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using namespace std;
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const double Rad_to_deg = 57.29577951;
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cout << "distance = " << pda->distance;
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cout << ", angle = " << pda->angle * Rad_to_deg;
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cout << " degrees\n";
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}
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// convert rectangular to polar coordinates
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void rect_to_polar(const rect * pxy, polar * pda)
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{
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using namespace std;
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pda->distance =
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sqrt(pxy->x * pxy->x + pxy->y * pxy->y);
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pda->angle = atan2(pxy->y, pxy->x);
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}
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