NAME

std::getchar - std::getchar

Synopsis

Defined in header <cstdio>
int getchar();

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: