我希望将程序中的数据输出到文本文件中。这是一个工作示例,显示我当前是如何做到的,其中还包括日期/时间(我正在运行Windows):
#include <iostream>
#include <fstream>
#include <time.h>
using namespace std;
int main()
{
char dateStr [9];
char timeStr [9];
_strdate(dateStr);
_strtime(timeStr);
ofstream output("info.txt", ios::out);
output << "Start time part 1 " << "\t" << timeStr << " on " << dateStr << "\n";
output << "Start time part 1000000 " << "\t" << timeStr << " on " << dateStr << "\n";
output.close();
return 0;
}
然而,作为用户,“info.txt”的输出对我来说不是很易读,因为两端的时间戳和日期戳没有对齐。这是输出:
Start time part 1 15:55:43 on 10/23/12
Start time part 1000000 15:55:43 on 10/23/12
我的问题是,有没有办法调整后一部分?
答案 0 :(得分:8)
是的,<iomanip>
标题提供了setw
操纵符,可让您将输出的每个字段的宽度设置为ostream
。对每行使用setw
操纵器而不是制表符可以更好地控制输出:
output << setw(25) << "Start time part 1 " << timeStr << " on " << dateStr << endl;
output << setw(25) << "Start time part 1000000 " << timeStr << " on " << dateStr << endl;
要对齐左侧的字符串,请添加left
操纵器:
output << left << setw(25) << "Start time part 1 " << timeStr << " on " << dateStr << endl;
output << left << setw(25) << "Start time part 1000000 " << timeStr << " on " << dateStr << endl;
答案 1 :(得分:3)
int max_align = 10;
output << "Start time part 1 " << "\t" << timeStr
<< std::string(max_align-timeStr.size(), " ") << " on " << dateStr << "\n";