[matumoto@localhost MENDEL]$ gcc testkaiko.c
testkaiko.c: In function `gosa':
testkaiko.c:12: warning: type mismatch in implicit declaration for built-in function `fabs'
[matumoto@localhost MENDEL]$ ./a.out
input seed>3
(lessn,moren)=      20,      980
[matumoto@localhost MENDEL]$