范例:
#include<stdio.h>
#include<stdarg.h>
int my_printf( const char *format,……)
{
va_list ap;
int retval;
va_start(ap,format);
printf(“my_printf( ):”);
retval = vprintf(format,ap);
va_end(ap);
return retval;
}
main()
{
int i = 150,j = -100;
double k = 3.14159;
my_printf(“%d %f %x\n”,j,k,i);
my_printf(“%2d %*d\n”,i,2,i);
}
执行 my_printf() : -100 3.14159 96
my_printf() : 150 150 |