#include<iostream> #include<vector>
int main()
{
std::vector<int> integers (12);
for (size_t loop=0; loop<integers.size(); ++loop)
cin >> integers[loop];
}
Use an input file stream (ifstream) to read from a file and an output file stream (ofstream) to write to a file. Both can be found in the <fstream> standard library header.
The <iostream> include file is a header file that contains the prototype declarations of functions that provide the basic input/output mechanisms in C++. The <iostream> header file sets up the objects that initialize the basic input/output pathways, cout and cin.
The file stream classes (ifstream and ofstream) are derivatives of the I/O stream classes (istream and ostream) that are specific to file input and output.
The following function will read any valid file name one byte at a time. int read_file(char* filename) { FILE* input=fopen( filename,"rb" ); if( !input ) { std::cerr<<"File access error: "<<filename<<std::endl; return( -1 ); } char ch; while( fread( &ch, 1, 1, input )==1 ) { // process the byte... } fclose( input ); return( 0 ); }
Yes, this is possible.
Use an input file stream (ifstream) to read from a file and an output file stream (ofstream) to write to a file. Both can be found in the <fstream> standard library header.
The <iostream> include file is a header file that contains the prototype declarations of functions that provide the basic input/output mechanisms in C++. The <iostream> header file sets up the objects that initialize the basic input/output pathways, cout and cin.
I guess you mean either input/output/inout/append or binary/text.
The file stream classes (ifstream and ofstream) are derivatives of the I/O stream classes (istream and ostream) that are specific to file input and output.
The following function will read any valid file name one byte at a time. int read_file(char* filename) { FILE* input=fopen( filename,"rb" ); if( !input ) { std::cerr<<"File access error: "<<filename<<std::endl; return( -1 ); } char ch; while( fread( &ch, 1, 1, input )==1 ) { // process the byte... } fclose( input ); return( 0 ); }
Yes, this is possible.
Yes, at least as far as C++ is concerned. Although you wouldn't regard the keyboard as being a file, to C++ there is no difference between accepting input from a disk-based file or from the keyboard: they are both streams and therefore they are both files. The same logic applies to the console window or a printer with regards output streams. However, it's probably easier to think of a file stream as being an abstraction. The user can redirect input and output from the command line as they see fit, so the same code will operate regardless of where the input or output is physically directed. Thus a file stream can be regarded as being a conceptual file rather than an actual disk-based file.
Input a variable.
File handling is simply the process of opening, reading, writing and closing files. Files are simply streams for input and output, or the "serialisation" of objects. In other words, reading and writing data to and from disk storage.
File handling is handled by input stream objects (ifstream) and output stream objects (ofstream), or bi-directional streams (fstream). These classes are derived from istream and ostream. See related links for more information on these classes.
For basic input and output in C++: #include
no