Here, strcat() is a function which takes two character pointers and returns a character pointer. s : a character pointer append : a pointer to constant character, i.e, we can not change the contents that this pointer points. use of register : if we register for integers they will be stored in CPU registers instead of Memory, so that, fetching will be faster. but, here s and append both are pointers. i don't think that they will be stored in registers. so, register does not play any role here. this function adds the contents of location pointed by append to the end of contents pointed by s and returns the address of first string. thanks, neo johnson
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