modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/ieee/920810-1.c (about)

     1  #include <stdio.h>
     2  double normalize(x)double x;{if(x==0)x=0;return x;}
     3  main(){char b[9];sprintf(b,"%g",normalize(-0.0));if(strcmp(b,"0"))abort();exit(0);}