See strtol for a more robust cross-platform alternative when this is a possibility. The function first discards as many whitespace characters (as in isspace) as necessary until the first non-whitespace character is found. In this post I will explain how to convert string to integer using pre-defined atoi () library function. Convert string to integer Parses the C-string str interpreting its content as an integral number, which is returned as a value of type int. In programming it is often required to convert string representation of integer to int type. If the converted value would be out of the range of representable values by an int, it causes undefined behavior. strtoumax () Function for Convert String to an Integer in C. C program to convert string to integer using atoi () library function. On success, the function returns the converted integral number as an int value. In c, we can convert or cast int to enum using explicit type casting and Enum.ToObject () method. Parameters str C-string beginning with the representation of an integral number. If the first sequence of non-whitespace characters in str is not a valid integral number, or if no such sequence exists because either str is empty or it contains only whitespace characters, no conversion is performed and zero is returned. The string can contain additional characters after those that form the integral number, which are ignored and have no effect on the behavior of this function. Then, starting from this character, takes an optional initial plus or minus sign followed by as many base-10 digits as possible, and interprets them as a numerical value. The function first discards as many whitespace characters (as in isspace) as necessary until the first non-whitespace character is found. Dont call library functions your code should perform the conversion itself It is fine to use constants from limits.h You should write conforming C code. Parses the C-string str interpreting its content as an integral number, which is returned as a value of type int.
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