C++ 字符串查找例子.

题目:

程序:

#include <stdio.h>
#include <cstdio>
#include <iostream>
#include <math.h>
#include <stack>
#include <queue>
#include <string>
#include <string.h>

#define FOR(i,n) for (int (i)=0;(i)<(n);(i)++)
#define elif else if
#define INF 1000000000

using namespace std;

int main () {
    int N=3;
    string a="1 2 3 4 5 6 7 8 9";
    char str[] = " ";
    int pos=0,lastpos=0;
    int index = 0;
    int lastidx = 1;
    cout << a[0]<<‘ ‘;
    while(1) {
        pos = a.find (str, lastpos + 1);
        index++;
        if (index == lastidx + N + 1) {
            lastidx = index;
            if (pos == -1) {
                cout << a[lastpos + 1, a.length () - 1] <<‘ ‘;
                break;
            }
            cout << a[lastpos + 1, pos - 1]<<‘ ‘;
        }
        if (pos == -1) break;
        lastpos = pos;
    }
    return 0;
}