/in/foo.c: In function 'look':
/in/foo.c:23:2: warning: statement with no effect [-Wunused-value]
  for(j;j<m;j++)
  ^~~
/in/foo.c:30:4: warning: statement with no effect [-Wunused-value]
    for(k;k<n;k++)
    ^~~
/in/foo.c: In function 'find':
/in/foo.c:52:3: warning: statement with no effect [-Wunused-value]
   for(i;i<=xmax;i++)
   ^~~
/in/foo.c:51:19: warning: unused variable 'j' [-Wunused-variable]
   int i=xmin,sqar,j=0,n,m=0;
                   ^
/in/foo.c: In function 'main':
/in/foo.c:70:2: warning: statement with no effect [-Wunused-value]
  for(i;i<n;i++)
  ^~~