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______ macro must be called before using ______ and ________

(a) va_arg, va_end and va_start

(b) va_start, va_end and va_arg

(c) va_end, va_arg and va_start

(d) v_arg, v_end and v_start

The question was posed to me at a job interview.

This question is from Variable Argument Lists topic in portion C Library of C

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Correct choice is (b) va_start, va_end and va_arg

Explanation: va_start macro must be called before using macros va_end and va_arg.

The macro void va_start(va_list p, last_arg) initializes p variable to be used with the va_arg and va_end macros.

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