| Revision as of 00:30, 19 July 2006 editCrazynas (talk | contribs)Extended confirmed users, Pending changes reviewers, Rollbackers6,478 editsm Reverted 1 edit by 193.1.172.138 (talk) to last revision (58025325) by Dkasak using VP← Previous edit | Revision as of 09:56, 31 March 2007 edit undo83.254.131.3 (talk) Bugfix (see getchar, common mistake)Next edit → | ||
| Line 19: | Line 19: | ||
| int ch, n = 0; | int ch, n = 0; | ||
| while (( |
while ((ch = getchar()) != EOF && n < 1000) | ||
| ++ |
str = ch; | ||
| for (int i = 0; i < n; ++i) | for (int i = 0; i < n; ++i) | ||
Revision as of 09:56, 31 March 2007
putchar is a function in 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, n = 0;
while ((ch = getchar()) != EOF && n < 1000)
str = ch;
for (int 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 indicatorm, whichever comes first.