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Input/Output from external file in C/C++, Java and Python for Competitive Programming
In this article, we will learn about Input/Output from an external files in C/C++, Java, and Python for Competitive Programming.
Python I/O from the file
In python, the sys module is used to take input from a file and write output to the file. Let’s look at the implementation in the form of code.
Example
import sys
# For getting input
sys.stdin = open('sample.txt', 'r')
# Printing the Output
sys.stdout = open('sample.txt', 'w')Java I/O from the file
Here we take the help of buffered reader method to take input associated with file reader to read input from file and print writer to print the data back to the file.
Example
// Java program For handling Input/Output
import java.io.*;
class Input {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new
FileReader("sampleinp.txt"));
PrintWriter pw=new PrintWriter(new
BufferedWriter(new
FileWriter("sampleout.txt")));
pw.flush();
}
}C/C++ I/O from a file
Here we take the help of free open() function and define the mode in which we want to open the file and what kind of operation we want to perform. By default mode is set to read-only
Example
#include<stdio.h>
int main() {
// For getting input
freopen("sampleinp.txt", stdin);
// Printing the Output
freopen("sampleout.txt", "w", stdout);
return 0;
}Conclusion
In this tutorial, we will learn about Input/Output from an external files in C/C++, Java, and Python for Competitive Programming.
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