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// ratio_subtract example
#include <iostream>
#include <ratio>
int main ()
{
typedef std::ratio<2,3> two_thirds;
typedef std::ratio<1,2> one_half;
typedef std::ratio_subtract<two_thirds,one_half> diff;
std::cout << "diff = " << diff::num << "/" << diff::den;
std::cout << " (which is: " << ( double(diff::num) / diff::den ) << ")" << std::endl;
return 0;
}
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