To use these functions, we need a variable capable of storing a variable-length argument list--this variable will be of type va_list. va_list is like any other type. For example, the following code declares a list that can be used to store a variable number of arguments. 1 va_list...
http://www.cprogramming.com/tutorial/c/lesson17.html #include <stdarg.h>#include<stdio.h>/*this function will take the number of values to average followed by all of the numbers to average*/doubleaverage (intnum, ... ) { va_list arguments;doublesum =0;/*Initializing arguments to store...
15. Variable-Length Argument Lists 15.1I heard that you have to#include<stdio.h>before callingprintf. Why? 15.2How can%fbe used for bothfloatanddoublearguments inprintf? Aren't they different types? 15.3I had a frustrating problem which turned out to be caused by the line...
The function call can provide more arguments than the number of argument variables defined in the function statement. You can pass arguments to a function that has no argument variable defined. To help us understand how use variable-length argument list feature, I wrote this tutorial example: ...
( double d in numbers ) 14 total += d; 15 16 return total / numbers.Length; 17 } // end method Average 18 19 public static void Main( string[] args ) 20 { 21 double d1 = 10.0; 22 double d2 = 20.0; 23 double d3 = 30.0; 24 double d4 = 40.0; 25 26 Console.WriteLine(...
a format string. Instead, let's start with the simplest variation: The following function accepts a variable number of positive integer arguments, and returns the integer average. To signal the end of the variable-length argument list, we must pass in aterminating valueof -1. Example of ...
"platform specific", the reality is that on Mac and iPhone Objective-C platforms, it is simply a byte buffer containing the arguments. In fact, if you've ever used an ABI inspection tool (likeclass-dump-x) on a method taking a variable argument list, you'll see that it is simply a...
Greetings everyone, I wrote a function to learn about variable-length argument lists. I wonder if there is a better way to detect the end of the argument list than using a sentinel value like the one I am using (NULL in this example) or an argument coun
A call to f in Visual C++ can pass an initialized array or a variable-length array.复制 // mcpp_paramarray4.cpp // compile with: /clr using namespace System; public ref class C { public: void f( ... array<String^>^ a ) {} }; int main() { C ^ myc = gcnew C(); myc-...
When variable length arguments appear in an interface, the default behavior is to drop the variable argument list entirely, replacing them with a single NULL pointer. For example, if you had this function, void traceprintf(const char *fmt, ...); ...