State the purpose and return data type of the following String functions:

(i) indexOf(char ch)

• Purpose: This function returns the index of the first occurrence of the specified character ch in the string. If the character is not found, it returns -1.
• Return Data Type: int

(ii) compareTo(String s)

• Purpose: This function compares two strings lexicographically. It returns a positive integer if the calling string is lexicographically greater than the specified string s, a negative integer if it is less, and 0 if both strings are equal.
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