一段C程序分析

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 
 4 void main()
 5 {
 6     int i;
 7     int sum = 0;
 8     char ch;
 9 
10     printf("请输入一串整数和任意数目的空格: ");
11 
12     while( scanf("%d", &i) == 1 )
13     {
14         sum += i;
15 
16         while( (ch=getchar()) == ‘ ‘ )
17             ;
18         if( ch == ‘\n‘ ) 
19         {
20             break;
21         }
22 
23         ungetc( ch, stdin );
24     }
25 
26     printf("结果是: %d", sum);
27     printf("\n");
28     system("pause");
29 }