fopen() in C++
In the world of computer science, file handling is a very important concept. A file is a type of portable storage that is used to store any type of data. Before a programmer applies any algorithm on a particular file, they need to open that file using the fopen() command.
Syntax
fopen() only has 2 parameters passed into it:
- name of the file
- file permissions
FILE *filePointer;
filePointer = fopen("filename.txt", "w");
File permissions
- r = Reads files, but only if they exist.
- w = Creates files and writes in them.
- r+ = Reads files for input and output (only if they exist).
- w+ = Creates files and opens them for both input and output.
Code
The following code opens a file and writes “Educative!” in it.
#include <cstdio>#include <cstring>using namespace std;int main(){int c;FILE *filePointer;filePointer = fopen("filename.txt", "w");char sampleString[20] = "Educative!";if (filePointer){for(int i=0; i<strlen(sampleString); i++)putc(sampleString[i],filePointer);}fclose(filePointer);}
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