long long int llabs (long long int n);
/n/ ).long long int version of abs .1
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/* llabs example */
#include <stdio.h> /* printf */
#include <stdlib.h> /* llabs */
int main ()
{
long long int n,m;
n=llabs(31558149LL);
m=llabs(-100000000LL);
printf ("n=%lld\n",n);
printf ("m=%lld\n",m);
return 0;
}n=31558149 m=100000000
long long int (such as llabs(LLONG_MIN) in an implementation with two's complement signed values), it causes undefined behavior.