How to output different contents in various (.txt) files ( C++)

Question

I created a program that can take an integer as its input from a file and generate multiplication tables from 1 up to that integer read from the file. For example, if the program reads (3) from the file, it will output:

1*1 = 1 1*2 = 2 ... up to 1*10 = 10 and then 2*1 = 1 ..... 2*10 = 10 and so on up to three suppose that the number read from the file is 3 3*1 = 1 .... 3*10 = 30

Now, I am trying to output each multiplication tables in different (.txt) files where for example table1.txt would contain 1*1 = 1 .... up to 1*10 = 10 and table2.txt would contain 2*1 = 2 .... up to 2*10 = 10 and the same procedure for table3.txt.

I can only create one file that only contains the first multiplication table and I do not know how to display the rest of the tables in different files.

I would really appreciate any help or insights to solve this problem. Thank you!

This is what I have:

#include <iostream> #include <fstream> using namespace std; int main () { int num, a, b; fstream inputStream; ofstream outputStream; inputStream.open("input.txt"); //let's say input.txt holds the number 3 while (inputStream >> num) outputStream.open("table.txt"); for (a = 1; a <= num; a++) { for (b = 1; b <= 10; b++) { outputStream << a << " X " << b << " = " << a*b << endl; } inputStream.close(); outputStream.close(); } return 0; }

possible duplicate of How to output content in multiple (.txt) files — Blastfurnace
– Blastfurnace, Commented Feb 23, 2015 at 4:46

Marcin Kolny · Accepted Answer · 2015-02-22 22:28:44Z

You should create new file for an every single loop iteration:

#include <iostream> #include <fstream> using namespace std; int main () { int num, a, b; fstream inputStream; ofstream outputStream; inputStream.open("input.txt"); //let's say input.txt holds the number 3 inputStream >> num; inputStream.close(); for (a = 1; a <= num; a++) { outputStream.open("table" + std::to_string(a) + ".txt"); for (b = 1; b <= 10; b++) { outputStream << a << " X " << b << " = " << a*b << endl; } outputStream.close(); } return 0; }

Note, that you should build your code with -std=c++11 flag, because of std::to_string method. This code generates you num files(tablenum.txt), each with multiplication table for specific number.

Your correction works well! A great thanks for your help!! Really appreciate it!!
Hi, Marcin. I understand your correction but why wouldn't just + (a) work instead of std::to_string(a) ? Thanks

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