Variable Arguments

• An under-used but very powerful feature

• printf() is an example where the number and types of arguments can differ from invocation to invocation

• /usr/include/stdarg.h provides definitions of:

  • a special type named va_list
  • three macros to implement variable arguments:
    • va_start
    • va_end
    • va_arg

• Another useful function is “vfprintf”, as shown in the next slide

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