glibc
2.9

#include <stdlib.h>
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Functions  
div_t  div (int numer, int denom) 
Definition at line 55 of file div.c.
{ div_t result; result.quot = numer / denom; result.rem = numer % denom; /* The ANSI standard says that QUOT <= NUMER / DENOM, where NUMER / DENOM is to be computed in infinite precision. In other words, we should always truncate the quotient towards zero, never infinity. Machine division and remainer may work either way when one or both of NUMER or DENOM is negative. If only one is negative and QUOT has been truncated towards infinity, REM will have the same sign as DENOM and the opposite sign of NUMER; if both are negative and QUOT has been truncated towards infinity, REM will be positive (will have the opposite sign of NUMER). These are considered `wrong'. If both are NUM and DENOM are positive, RESULT will always be positive. This all boils down to: if NUMER >= 0, but REM < 0, we got the wrong answer. In that case, to get the right answer, add 1 to QUOT and subtract DENOM from REM. */ if (numer >= 0 && result.rem < 0) { ++result.quot; result.rem = denom; } return result; }