[C]可變參量，debugprint函式

造冰箱的大熊貓@cnblogs 2024/6/20

1、可變參量

#include <stdio.h>
#include <stdarg.h>
 
void debugprint ( const char *format, ... )
{
  va_list args;
  va_start(args, format);
  printf(format, args);
  va_end(args);
}

int main()
{
  debugprint ( "Hello, %s!\n", "world" );
  debugprint ( "The value is: %d, %d, %d\n", 10, 20, 30 );
  return 0;
}

2、debugprint函式

#include <stdio.h>
#include <stdarg.h>
 
void DebugPrintFunc ( const char *format, ... )
{
    va_list args;
    va_start(args, format);
    printf(format, args);
    va_end(args);
}

#ifdef _DEBUG
#define debugprint (format, args...) DebugPrintFunc(format, args)
#else
#define debugprint (format, args...)
#endif

int main()
{
  debugprint ( "Hello, %s!\n", "world" );
  debugprint ( "The value is: %d, %d, %d\n", 10, 20, 30 );
  return 0;
}