M
ORE
S
AMPLE
C P
ROGRAMS
ECS 30-A — S
PRING
2002
Version of April 15, 2002 11:14 pm Page 1 of 9
More Sample C Programs
Program #1: Copy Input, Version 1
This program reads an input line, and retains the newline; normally you would have a function to do this (there are
some in the Standard I/O Library, for instance) but it does show how to use character arrays and pointers. This ver-
sion uses arrays.
#include <stdio.h>
#define BUFSIZE 1024 /* maximum input line length */
/*
* echo the input back to the output, but print the number
* of characters read at the beginning of the line
*/
void main(void)
{
char line[BUFSIZE]; /* input buffer */
int c; /* input character */
int i = 0; /* counter in while loop */
/*
* read input a line at a time, and print it out
* if line too long, split at BUFSIZE chars
*/
do{
/* load up to max-1 chars into the buffer buf */
i = 0;
while(i < BUFSIZE-1 && (c = getchar()) != EOF && c != '\n')
line[i++] = c;
/* end the string with a newline */
if (c == '\n')
line[i++] = c;
/* tack on the string terminator */
line[i] = '\0';
/* print it out */
if (i != 0)
printf("%3d %s", i, line);
} while (c != EOF);
/*
* say goodbye!
*/
exit(0);
}
