/in/ex1.c: In function 'str2cpx':
/in/ex1.c:33:29: warning: 'sizeof' on array function parameter 'in' will return size of 'char *' [-Wsizeof-array-argument]
     for ( i = 1; i <= sizeof( in ) / sizeof( in[ 0 ] ); i++ ){
                             ^
/in/ex1.c:26:19: note: declared here
 cpx str2cpx( char in[] )
                   ^~
/in/ex1.c:38:37: warning: 'sizeof' on array function parameter 'in' will return size of 'char *' [-Wsizeof-array-argument]
             for ( j = i; j <= sizeof( in ) / sizeof( in[ 0 ] ); j++ ){
                                     ^
/in/ex1.c:26:19: note: declared here
 cpx str2cpx( char in[] )
                   ^~