/in/foo.c: In function 'fmn':
/in/foo.c:11:9: warning: 'max' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return max;
         ^~~
/in/foo.c: In function 'main':
/in/foo.c:21:4: warning: 'max' may be used uninitialized in this function [-Wmaybe-uninitialized]
  n1=fmn(a,n1);
  ~~^~~~~~~~~~
/in/foo.c:23:2: warning: 'max' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%d %d\n",n1,n2);
  ^~~~~~~~~~~~~~~~~~~~~~~