This document provides information on common string manipulation functions in C including strcmp(), strcat(), strcpy(), and strlen(). It compares two strings with strcmp(), concatenates two strings with strcat(), copies one string to another with strcpy(), and calculates the length of a string with strlen(). The document also mentions that string manipulation functions are declared in string.h.

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strcmp strcmp(string 1,string 2)
strcat strcat (string 1,string 2)
strcpy strcpy (string 1,string 2)
strlen strlen (string)
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