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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_01
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1001098d
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1991-11-23
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91 lines
Listing 11
//
// rational.cpp
//
#include <stdlib.h>
#include "rational.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);
}
long gcd(long x, long y)
{
x = labs(x);
y = labs(y);
while (x != y)
{
if (x < y)
y -= x;
if (y < x)
x -= y;
}
return x;
}
void rational::simplify()
{
long x = gcd(num, denom);
num /= x;
denom /= x;
}