白话/图示 可变参数的函数执行流程

#include <stdio.h>
#include <stdarg.h>
void pp(char *fmt,...)
{
 char *arg;
 int i;
 double d;
 char c;
 char *s;
 printf("%s",fmt);
 arg=(char *)&fmt+4;
 i=*(int *)arg;
 printf("%d",i);
 arg+=sizeof(int);
 d=*(double *)arg;
 printf("%f",d);
 arg+=sizeof(double);
 c=*(char *)arg;
 printf("%c",c);
 arg+=sizeof(char *);
 c=*(char *)arg;
 printf("%c",c);
 arg+=sizeof(char *);
 s=*(char **)arg;
 printf("%s",s);
 arg+=sizeof(char *);
 arg = (void *)0;
}
void ppp(char *fmt,...)
{
 va_list args=NULL;
 va_start (args, fmt);
 printf("%s\n",fmt);
 printf("%d",*(char *)(args));
 printf("%f",*(double *)(args+4));
 printf("%c",*(char *)(args+4+8));
 printf("%c",*(char *)(args+4+8+4));
 printf("%s",*(char **)(args+4+8+4+4));
 va_end (args); 
}
int main(void)
{
 //printf("hello\n%d%f%c%c%s",3,3.6,'\n','a',"world\n");
 //pp("hello\n",3,3.6,'\n','a',"world\n");
 ppp("hello\n%d%f%c%c%s",3,3.6,'\n','a',"world\n");
 return 0;
}