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C/C++ Users Group Library 1996 July
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C-C++ Users Group Library July 1996.iso
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v_10_03
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1003069a
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1992-01-11
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78 lines
Listing 2
//
// rational.cpp
//
#include "mylib.h"
#include "rat1.h"
rational &rational::operator+=(rational r)
{
num = num * r.denom + r.num * denom;
denom *= r.denom;
simplify();
return *this;
}
rational &rational::operator-=(rational r)
{
num = num * r.denom - r.num * denom;
denom *= r.denom;
simplify();
return *this;
}
rational &rational::operator*=(rational r)
{
num *= r.num;
denom *= r.denom;
simplify();
return *this;
}
rational &rational::operator/=(rational r)
{
num *= r.denom;
denom *= r.num;
simplify();
return *this;
}
rational rational::operator+(rational r)
{
rational result(*this);
return result += r;
}
rational rational::operator-(rational r)
{
rational result(*this);
return result -= r;
}
rational rational::operator*(rational r)
{
rational result(*this);
return result *= r;
}
rational rational::operator/(rational r)
{
rational result(*this);
return result /= r;
}
void rational::put(FILE *f)
{
fprintf(f, "(%ld/%ld)", num, denom);
}
void rational::simplify()
{
long x = gcd(num, denom);
num /= x;
denom /= x;
}