Putchar
From Wikipedia, the free encyclopedia
- The correct title of this article is putchar. The initial letter is shown capitalized due to technical restrictions.
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.
[edit] 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[1000];
int ch, n = 0;
while ((ch = getchar()) != EOF && n < 1000)
str[n++] = ch;
for (int i = 0; i < n; ++i)
putchar(str[i]);
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.
