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std::getchar

From cppreference.com
< cpp‎ | io‎ | c
 
 
 
 
Defined in header <cstdio>
int getchar();

Reads the next character from stdin.

Equivalent to std::getc(stdin).

Contents

[edit] Parameters

(none)

[edit] Return value

The obtained character on success or EOF on failure.

If the failure has been caused by end of file condition, additionally sets the eof indicator (see std::feof()) on stdin. If the failure has been caused by some other error, sets the error indicator (see std::ferror()) on stdin.

[edit] Example

std::getchar with error checking. Exit program by entering ESC char.

#include <cctype>
#include <cstdio>
#include <cstdlib>
#include <iomanip>
#include <iostream>
 
int main()
{
    for (int ch; (ch = std::getchar()) != EOF ; ) { // read/print "abc" from stdin
        if (std::isprint(ch))
            std::cout << static_cast<char>(ch) << '\n';
        if (ch == 27) // 'ESC' (escape) in ASCII
            return EXIT_SUCCESS;
    }
 
    // Test reason for reaching EOF.
    if (std::feof(stdin)) {  // if failure caused by end-of-file condition
        std::cout << "End of file reached\n";
    }
    else if (std::ferror(stdin)) {  // if failure caused by some other error
        std::perror("getchar()");
        std::cerr << "getchar() failed in file " << std::quoted(__FILE__)
                  << " at line # " << __LINE__ - 14 << '\n';
        std::exit(EXIT_FAILURE);
    }
 
    return EXIT_SUCCESS;
}

Possible output:

abc
a
b
c
^[

[edit] See also

gets a character from a file stream
(function) [edit]
C documentation for getchar