C String Functions

There are many important string functions defined in "string.h" library.

1)strlen(string_name)returns the length of string name.
2)strcpy(destination, source)copies the contents of source string to destination string.
3)strcat(first_string, second_string)concats or joins first string with second string. The result of the string is stored in first string.
4)strcmp(first_string, second_string)compares the first string with second string. If both strings are same, it returns 0.
5)strrev(string)returns reverse string.
6)strlwr(string)returns string characters in lowercase.
7)strupr(string)returns string characters in uppercase.
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