2014-03-18 01:30
题目:反转一个char *型的C/C++字符串。
解法:一头一尾俩iterator,向中间靠拢并且交换字符。
代码:
1 // 1.2 Implement a function void reverse(char *str) in C or C++ which reverses a null-terminated string. 2 #include <cstdio> 3 #include <cstring> 4 using namespace std; 5 6 void reverse(char *str) 7 { 8 if (nullptr == str) { 9 return; 10 } 11 12 size_t i; 13 size_t len = strlen(str); 14 char ch; 15 16 for (i = 0; i < len - 1 - i; ++i) { 17 ch = str[i]; 18 str[i] = str[len - 1 - i]; 19 str[len - 1 - i] = ch; 20 } 21 } 22 23 int main() 24 { 25 char str[1000]; 26 27 while (scanf("%s", str) == 1) { 28 reverse(str); 29 printf("%s ", str); 30 } 31 32 return 0; 33 }