1 #include<stdio.h> 2 3 int main(void) 4 { 5 char str[80]; 6 char chs[80]; 7 int i; 8 for (i = 0; i < 80; i++) 9 { 10 str[i] = getchar(); 11 if (str[i] == ' ') 12 { 13 break; 14 } 15 } 16 17 int k = i - 1; //此时i是字符串有效长度 18 int j = 0; 19 while (k >= 0) 20 { 21 chs[k] = str[j]; 22 k--; 23 j++; 24 } 25 26 for (k = 0; k < i; k++) 27 { 28 putchar(chs[k]); 29 } 30 31 return 0; 32 }