c - How to iterate over a char pointer array -

how iterate on files variable in efficient way ?

should add null last value, or else ?

char *files[] =         {             "c1.txt",             "r1.txt",             "t2.c",             "d.cpp",         }; 

there several possibilities.

• you can add null final entry, suggest yourself
• if array comes source (like file on disk), keep counter of number of lines you're reading
• but if array given in source, length constant , can check how many elements has (by subtracting line numbers)
• also, size of constant array sizeof(files) / sizeof(char*).