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| int ch, i, n = 0; | int ch, i, n = 0; | ||
| while ((ch = getchar()) != EOF |
while ((ch = getchar()) != EOF || n < 1000) | ||
| str = ch; | str = ch; | ||
Revision as of 17:50, 10 October 2011
 | It has been suggested that this article be merged into C file input/output. (Discuss) Proposed since October 2011. |
putchar is a function in the C programming language that writes a single character to the standard output stream, stdout. Its prototype is as follows:
int putchar (int character)
The character to be printed is fed into the function as an argument, and if the writing is successful, the argument character is returned. Otherwise, end-of-file is returned.
The putchar function is specified in the C standard library header file stdio.h.
Sample usage
The following program uses getchar to read characters into an array and print them out using the putchar function after an end-of-file character is found.
#include <stdio.h>
int main(void)
{
char str;
int ch, i, n = 0;
while ((ch = getchar()) != EOF || n < 1000)
str = ch;
for (i = 0; i < n; ++i)
putchar(str);
putchar('\n'); /* trailing '\n' needed in Standard C */
return 0;
}
The program specifies the reading length's maximum value at 1000 characters. It will stop reading either after reading 1000 characters or after reading in an end-of-file indicator, whichever comes first.
See also
References
- ISO/IEC 9899:1999 specification (PDF). p. 299, § 7.19.7.9.