std::getchar
Defined in header <cstdio> |
||
|---|---|---|
|
Reads the next character from stdin.
Equivalent to std::getc(stdin).
Parameters
(none)
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.
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
^[See also
| gets a character from a file stream (function) |
|
C documentation for getchar |
|
© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/io/c/getchar