读取姓名并格式化

• 用双引号将其打印
• 将其打印在20个字符宽的字段中，整个字段用引号括起，名称在字段的右端。
• 在20字符宽的字段的左端打印它，整个字段用引号括起来。
• 将其打印在比名称宽三个字符的字段中。

#include <stdio.h>
#include <string.h>

int main(void)
{
  char name[20];/*from   w  w  w.j ava  2 s.c o  m*/
  int name_length;

  printf("Enter your first name: ");
  scanf("%s", name);
  name_length = strlen(name);
  printf("/"%s/"/n", name); // a. enclosed in double quotes
  printf("/"%20s/"/n", name); // b. double quotes, 20 char wide, right-justified
  printf("/"%-20s/"/n", name); // c. double quotes, 20 char wide, left-justified
  printf("/"%*s/"/n", name_length + 3, name); // d. double quotes, 3 char wider than name

  return 0;
}