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C/C++ Source Codes

programme on class "vector" with information:The ; and no {} shows a prototype

#include <iostream.h>
class vector
double x;
double y;
double surface(); // The ; and no {} shows it is a prototype

double vector::surface()
double s = 0;
for (double i = 0; i < x; i++)
s = s + y;
return s;
void main ()
vector k;
k.x = 4;
k.y = 5;
cout << "Surface : " << k.surface() << endl;

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