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Function Details : va_arg

Tva_arg(va_list ap,T type) ;

Return Type : T

Represents a placeholder for a specific type (e.g., `int`, `double`, `char *`) used in variadic functions with macros like `va_arg`. The actual type must match the argument being accessed.
Read about return values of va_arg function .

1st Parameter Type : va_list

A data type used to hold information about variable arguments passed to a variadic function. It is initialized with `va_start`, used with `va_arg`, and cleaned up with `va_end`.

1st Parameter

The variable argument list object that holds the arguments passed to a variadic function. It must have been initialized with `va_start`.

2nd Parameter Type : T

Represents a placeholder for a specific type (e.g., `int`, `double`, `char *`) used in variadic functions with macros like `va_arg`. The actual type must match the argument being accessed.

2nd Parameter

The type of the next argument to retrieve from the list.

Read more about parameters of va_arg in parameters section
The va_argfunction in C language Retrieves the next argument in a function with a variable number of arguments.
va_arg is a macro that expands to an expression of the type and value of the next argument in a call to a variadic function. It modifies ap so that the next call to va_arg returns the next argument. The type parameter is a type name specified so that the type of the object after promotion can be determined.
The va_argfunction takes 2 parameters:
  • •
    va_list `ap`: The variable argument list object that holds the arguments passed to a variadic function. It must have been initialized with `va_start`.
  • •
    T `type`: The type of the next argument to retrieve from the list.
Retrieves the next argument in the variable argument list `ap`, interpreting it as the specified `type`. The `type` must match the type of the actual argument passed to the function. Undefined behavior occurs if the type does not match or if `va_arg` is used after all arguments have been retrieved. Must be used in conjunction with `va_start` and `va_end`.
The va_arg function return value :
  • Returns the next argument in the variable argument list

Output

This example demonstrates using va_arg to retrieve integer arguments in a variadic function.