%*s格式说明符是什么意思?

It's used to specify, in a dynamic way, what the width of the field is

所以“缩进”指定要为参数列表中紧随其后的字符串分配多少空间。

所以

printf("%*s", 5, "");

printf("%5s", "");

这是在文件中放置一些空格的好方法,可以避免循环。

less right justified

greater expands

Java™ How To Program (Early Objects), Tenth Edition

printf("%*d", 5, 10) //will result in "10" being printed with a width of 5.

http://www.cplusplus.com/reference/clibrary/cstdio/printf/

printf("%*s", 4, myValue); printf("%4s", myValue);

在printf和fprintf中使用时:

printf("%*s", 4, myValue); is equivalant to printf("%4s", myValue);

在scanf和sscanf中使用时:

/* sscanf example */
#include <stdio.h>

int main ()
{
  char sentence []="Rudolph is 12 years old";
  char str [20];
  int i;

  sscanf (sentence,"%s %*s %d",str,&i);
  printf ("%s -> %d\n",str,i);
  
  return 0;
}

Rudolph -> 12