C primer 第十章 函数 浅谈 实参和形参

 1 #include<stdio.h>
 2 #include<string.h>
 3 #define NAME "heipi"
 4 #define ADDRESS "wu han university of techonology "
 5 #define PLACE "shang hai , pu dong "
 6 #define WIDTH 40 
 7 #define SPACE ‘ ‘ 
 8 void show_n_char(char ch , int num );
 9 int main()
10 { 
11 int spaces;
12 show_n_char(‘*‘,WIDTH);
13 putchar(‘\n‘);
14 
15 spaces=(WIDTH-strlen(NAME))/2;
16 show_n_char(SPACE,spaces);
17 printf("%s\n",NAME);
18 
19 spaces=(WIDTH-strlen(ADDRESS))/2;
20 show_n_char(SPACE,spaces);
21 printf("%s",ADDRESS);
22 
23 putchar(‘\n‘);
24 
25 spaces=(WIDTH-strlen(PLACE))/2;
26 show_n_char(SPACE,spaces);
27 printf("%s\n",PLACE);
28 show_n_char(‘*‘,WIDTH);
29 printf("\n");
30 
31  
32 
33 }
34 
35 void show_n_char(char ch , int num )
36 {
37 int count ;
38 for(count=1;count<=num;count++)
39 putchar(ch);
40 
41 }