将 2进制整数转化为十进制输出到文件中

/** 将 2进制整数转化为十进制输出到文件中* 文件的输出练习*   by AutuanLiu*/#include <iostream>#include <fstream>#include <ctime>#include <cstdlib>using namespace std;int trans(int bi){    int weight = 1;    int sum = 0;    while (bi != 0)    {        sum += bi % 10 * weight;        weight *= 2;        bi /= 10;    }    return sum;}int main(int argc, char const *argv[]){    int bnum;    srand(time(0));    int num = rand() % 10 + 1;    ofstream out("output.txt", ios_base::out);    if (!out)    {        cerr << "The file can't open!" << endl;        return -1;    }    else    {        cout << "Input " << num << " times binary num:" << endl;        for (int i = 0; i < num; ++i)        {            cin >> bnum;            out << trans(bnum) << endl;        }    }    return 0;}

// by AutuanLiu

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