编一个函数，输入一个字符串，要求做一个新字符串，把其中所有的一个或多个连续的空白字符都压缩为一个空格。这里所说的空白包括空格、' '、' '、' '。例如原来的字符串是：
This Content hoho is ok
ok?
file system
uttered words ok ok ?
end.
压缩了空白之后就是：
This Content hoho is ok ok? file system uttered words ok ok ? end.
1 #include <stdio.h> 2 int judge_char(char ch) 3 { 4 int result; 5 switch(ch) 6 { 7 case ' ':result = 0;break; 8 case ' ':result = 0;break; 9 case ' ':result = 0;break; 10 case ' ':result = 0;break; 11 default:result = 1; 12 } 13 return result; 14 } 15 16 char *shrink_space(char *dest, const char *src, int n) 17 { 18 int i = 0; 19 char *tmp = dest; 20 while(i < n && *src != ' ') 21 { 22 if(judge_char(*src)) 23 *tmp++ = *src++; 24 else 25 { 26 if(!judge_char(*(src - 1))) 27 src++; 28 else 29 { 30 *tmp++ = ' '; 31 src++; 32 } 33 } 34 i++; 35 } 36 *tmp = ' '; 37 return dest; 38 } 39 40 int main(void) 41 { 42 char a[100]; 43 char b[50] = "This 44 Content hoho is ok"; 45 printf("%s ",shrink_space(a,b,50)); 46 }