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getopt C

Daniel E. answered on September 8, 2022 Popularity 9/10 Helpfulness 6/10

answer getopt C

getopt C

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The getopt() function is a builtin function in C and is used to parse command line arguments.

Syntax:

getopt(int argc, char *const argv[], const char *optstring)

optstring is simply  a list of characters, 
each representing a single character option.

Return Value: The getopt() function returns different values:

If the option takes a value, that value is pointer to the external variable optarg.
‘-1’ if there are no more options to process.
‘?’ when there is an unrecognized option and it stores into external variable optopt.
If an option requires a value (such as -f in our example) and no value is given, getopt normally returns ?.
By placing a colon as the first character of the options string, getopt returns: instead of ? when no value is given.

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Source: www.geeksforgeeks.org

Tags: c getopt whatever

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