Which standard library function compares two strings for equality?

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BlackTom AI · Accepted Answer

Question: Which standard library function compares two strings for equality?

Option 1: strcmp
Explanation: strcmp is the standard function used to compare two strings lexicographically; it returns 0 when the strings are equal, and a nonzero value when they differ. This behavior directly addresses equality testing between strings, which is what the question asks for.

Option 2: strcpy
Explanation: strcpy copies the contents of one string into another buffer. It does not perform any comparison between the two strings, so it does not answer the question about equality testing.

Option 3: strlen
Explanation: strlen computes the length of a string, i.e., the number of characters before the terminating null character. It does not compare two strings for equality, only measures length.

Option 4: strncmp
Explanation: strncmp compares up to n characters of two strings and can be used to check for equality within a fixed limit. While it can determine equality for the first n characters, it is not the standard function designated solely for equality testing of entire strings unless you specify the full length of both strings; the question asks for the standard library function that compares two strings for equality in general, for which strcmp is the typical and direct choice.

Which standard library function compares two strings for equality?

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