C语言中的可变参数

6月 202016

参考： http://www.tutorialspoint.com/c_standard_library/c_macro_va_start.htm （这的代码可以执行的哦）

#include<stdarg.h>
#include<stdio.h>

int sum(int, ...);

int main(void)
{
   printf("Sum of 10, 20 and 30 = %d\n",  sum(3, 10, 20, 30) );
   printf("Sum of 4, 20, 25 and 30 = %d\n",  sum(4, 4, 20, 25, 30) );

   return 0;
}

int sum(int num_args, ...)
{
   int val = 0;
   va_list ap;
   int i;

   va_start(ap, num_args);
   for(i = 0; i < num_args; i++)
   {
      val += va_arg(ap, int);
   }
   va_end(ap);
 
   return val;
}

#include<stdarg.h>

#include<stdio.h>

int sum(int, ...);

int main(void)

{

printf("Sum of 10, 20 and 30 = %d\n", sum(3, 10, 20, 30) );

printf("Sum of 4, 20, 25 and 30 = %d\n", sum(4, 4, 20, 25, 30) );

return 0;

}

int sum(int num_args, ...)

{

int val = 0;

va_list ap;

int i;

va_start(ap, num_args);

for(i = 0; i < num_args; i++)

{

val += va_arg(ap, int);

}

va_end(ap);

return val;

}

指南站： http://www.tutorialspoint.com

原文链接：https://phpor.net/blog/post/3599

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C语言中的可变参数

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