【笔记】c++文件

1、文件。

#include <iostream>
#include <cstdio>
#include <string>
#include <cstring>
#include <ctime>
#include <cstdlib>
using namespace std;
char *ch = "qwertyuiopasdfghjklzxcvbnm";

void setOut(string dataType) {
    string out = dataType + ".data";
    freopen(out.c_str(), "w", stdout);
}

char *Random(char* word) {
    int len = rand() % ;
    for (int i = ; i != len; ++i)
        word[i] = ch[rand()% + ];
    word[len] = '\0';
    return word;
}

void make() {
    srand(unsigned(time()));
    char word[];
    for (int i = ; i != ; ++i) {
        cout << Random(word) << endl;
    }
}

int main() {
    setOut("Random");
    make();
    return ;
}

从文件读，写入文件：

void setIO(string in, string out) {
    freopen(in.c_str(), "r", stdin);
    freopen(out.c_str(), "w", stdout);
}