/in/foo.c: In function 'noco':
/in/foo.c:21:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(j=0;j<num;i=i+2)
  ^~~
/in/foo.c:23:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   return num;
   ^~~~~~
/in/foo.c:17:10: warning: unused variable 'k' [-Wunused-variable]
  int i,j,k,num;
          ^
/in/foo.c:18:25: warning: 'num' is used uninitialized in this function [-Wuninitialized]
  for(i=1;n*n*n==(2*i+num-1)*num/2;i++)
                 ~~~~~~~~^~~