strtok函数应用

char *strtok(char s[], const char *delim);

#include<iostream>
#include<string.h>
#include<string>
using namespace std;
int main()
{
    char str[] = "Hello world";
    char *token = strtok(str," ");
    //cout << token << endl;
    while (token != NULL)
    {
        string s(token);
        token = strtok(NULL," ");
        cout << s << endl;
    }
    return 0;
}

输出：
[root@localhost c++]# ./a.out
Hello
world

应用：删除重复字符串

#include<iostream>
#include<map>
#include<string.h>
#include<string>
using namespace std;
int main()
{
    char str[200] = {0};
    char strbak[200] = {0};
    char *token = NULL;
    map<string,int> wordMap;
    string output;
    int i = 0,j = 0;
    gets(str);
    for (int i = 0;str[i] != '\0';i++)
    {
        if (str[i] == ',' || str[i] == ' ')
        {
            strbak[j] = ' ';
            j++;
        }
        else
        {
            strbak[j] = str[i];
            j++;
        }
    }
    strbak[j] = '\0';
    strncpy(str,strbak,sizeof(strbak)+1);
    token = strtok(str," ");
    while (token != NULL)
    {
        string s(token);
        wordMap[s]++;
        token = strtok(NULL," ");
    }
    int count = 0;
    token = strtok(strbak," ");
    while (token != NULL)
    {
        string s(token);
        if (wordMap[s] >= 1)
        {
            if (count == 0)
            {
                output = output+s;
                wordMap[s] = 0;
            }
            else
            {
                output = output+" "+s;
                wordMap[s] = 0;
            }
            count++;
        }
        token = strtok(NULL," ");
    }
    cout << output<< endl;
    return 0;
}

运行结果：
[root@localhost c++]# ./a.out
i love love zhouyi
i love zhouyi