按单词逆序字符串

按单词逆序字符串（以空格分隔），使用栈实现。

#include <iostream>
#include <stack>
#include <cstring>

void printStack(stack<char> *s)
{
    while (!s->empty())
    {
        char c = s->top();
        printf("%c", c);
        s->pop();
    }
}

void reverseStringByWord(char *src)
{
    int len = strlen(src) + 1;
    char *tmp = src;
    stack<char> word;

    while (len-- != 0)
    {
        if (*tmp == '\0')
            break;
        if (*tmp == ' ')
        {
            printStack(&word);
            printf(" ");
            tmp++;
        }
        else
        {
            char c = *tmp++;
            word.push(c);
        }
    }

    printStack(&word);
    printf("\n");
}

int main(int argc, char *argv[])
{
    reverseStringByWord("  abc   def ghijk   lmn");

    getchar();

    return 0;
}