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#include <iostream>
// here we have a bunch of structures to represent
// 3 dimensional math vectors, one with integer values
// and another with double precision floating point values
struct vec3i {
int x;
int y;
int z;
};
struct vec3d {
double x;
double y;
double z;
};
// and we define the dot product operation
int dot(vec3i v, vec3i w) {
return v.x * w.x + v.y * w.y + v.z * w.z;
}
// notice that this function is also called dot() like the one above
// the difference is in the return value and the arguments
// this functions is said to *overload* the one before
double dot(vec3d v, vec3d w) {
return v.x * w.x + v.y * w.y + v.z * w.z;
}
int main(int argc, char *argv[]) {
vec3i a = { 1, 2, 3 };
vec3i b = { 1, 2, 3 };
// lets use our data and functions
std::cout << dot(a, b) << std::endl;
vec3d c = { .5, .2, 11.2 };
vec3d d = { .2, .2, 12.3 };
// notice how the compiler recognizes the type of the argument
// and calls the correct dot() function
std::cout << dot(c, d) << std::endl;
return 0;
}
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