From 82ba818ff456bcd6d56a06226e3f27e98fbb55c3 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Thu, 14 Aug 2025 22:58:58 -0500 Subject: removing all downloaded devdocs files --- devdocs/c/variadic%2Fva_arg.html | 54 ---------------------------------------- 1 file changed, 54 deletions(-) delete mode 100644 devdocs/c/variadic%2Fva_arg.html (limited to 'devdocs/c/variadic%2Fva_arg.html') diff --git a/devdocs/c/variadic%2Fva_arg.html b/devdocs/c/variadic%2Fva_arg.html deleted file mode 100644 index 841667fa..00000000 --- a/devdocs/c/variadic%2Fva_arg.html +++ /dev/null @@ -1,54 +0,0 @@ -

va_arg

Defined in header <stdarg.h> 
T va_arg( va_list ap, T );
-

The va_arg macro expands to an expression of type T that corresponds to the next parameter from the va_list ap.

-

Prior to calling va_arg, ap must be initialized by a call to either va_start or va_copy, with no intervening call to va_end. Each invocation of the va_arg macro modifies ap to point to the next variable argument.

-

If the type of the next argument in ap (after promotions) is not compatible with T, the behavior is undefined, unless:

-

If va_arg is called when there are no more arguments in ap, the behavior is undefined.

-

Parameters

- - -
ap - an instance of the va_list type
T - the type of the next parameter in ap

Expanded value

the next variable parameter in ap

-

Example

#include <stdio.h>
-#include <stdarg.h>
-#include <math.h>
- 
-double stddev(int count, ...) 
-{
-    double sum = 0;
-    double sum_sq = 0;
-    va_list args;
-    va_start(args, count);
-    for (int i = 0; i < count; ++i) {
-        double num = va_arg(args, double);
-        sum += num;
-        sum_sq += num*num;
-    }
-    va_end(args);
-    return sqrt(sum_sq/count - (sum/count)*(sum/count));
-}
- 
-int main(void) 
-{
-    printf("%f\n", stddev(4, 25.0, 27.3, 26.9, 25.7));
-}

Output:

-
0.920258

References

See also

- - - - -
-
(C99)
 makes a copy of the variadic function arguments
(function macro)
ends traversal of the variadic function arguments
(function macro)
holds the information needed by va_start, va_arg, va_end, and va_copy
(typedef)
enables access to variadic function arguments
(function macro)
C++ documentation for va_arg
-

- © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
- https://en.cppreference.com/w/c/variadic/va_arg -

-
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