Program to validate an IP address - GeeksforGeeks

Program to validate an IP address - GeeksforGeeks

Write a program to Validate an IPv4 Address. According to Wikipedia, IPv4 addresses are canonically represented in dot-decimal notation, which consists of four decimal numbers, each ranging from 0 to 255, separated by dots, e.g., 172.16.254.1 Following are steps to check whether a given string is valid IPv4 address or not: step 1) Parse string with "." as delimiter using " strtok() " function. e.g. ptr = strtok(str, DELIM); step 2) ……..a) If ptr contains any character which is not digit then return 0 ……..b) Convert "ptr" to decimal number say 'NUM' ……..c) If NUM is not in range of 0-255 return 0 ……..d) If NUM is in range of 0-255 and ptr is non-NULL increment "dot_counter" by 1 ……..e) if ptr is NULL goto step 3 else goto step 1 step 3) if dot_counter != 3 return 0 else return 1. // Program to check if a given string is valid IPv4 address or not #include #include #include #define DELIM "." /* return 1 if string contain only digits,

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