Learn To Solve It
Exercise 7.8 - Print Pages to Files¶
Question¶
Write a program to print a set of files, starting each new one on a new page, with a title and a running page count for each file.
/*
* Write a program to print a set of files, starting each new one on a new page,
* with a title and a running page count for each file.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define LINELENGTH 80
#define LINESPERPAGE 10
void printpages(FILE *, FILE *);
int main(int argc, char *argv[]) {
FILE *fp;
char *prog = argv[0];
int linecount = 0;
if (argc == 1) /* no args; copy standard input */
{
fprintf(stderr, "No files given");
printpages(stdin, stdout);
} else
while (--argc > 0)
if ((fp = fopen(*++argv, "r")) == NULL) {
fprintf(stderr, "%s: can't open %s\n", prog, *argv);
exit(1);
} else {
fprintf(stdout, "\n\n\t\t\tFile: %s\n\n", *argv);
printpages(fp, stdout);
fclose(fp);
}
if (ferror(stdout)) {
fprintf(stderr, "%s: error writing stdout\n", prog);
exit(2);
}
exit(0);
}
/* filecopy: copy file ifp to file ofp */
void printpages(FILE *ifp, FILE *ofp) {
int c;
int line = 0;
int pg = 1;
while ((c = getc(ifp)) != EOF) {
putc(c, ofp);
if (c == '\n') {
line = line + 1;
if (line == LINESPERPAGE) {
fprintf(stdout, "\n\t\t\tPage %d End.\n\n", pg);
pg = pg + 1;
line = 0;
}
}
}
}
Explanation¶
This takes a file as argument, and prints the file into number of pages, with Page # End as a de-mark at the end of the page.
$ ./ex_7.8 README.md
File: README.md
# https://learntosolveit.com
[https://learntosolveit.com](https://learntosolveit.com) is a website to learn C programming using K&R book. It uses modern tools, and is designed to be used along with the book.
To practice the exercises, you can use the online compilers like
* [https://www.tutorialspoint.com/compile_c_online.php](https://www.tutorialspoint.com/compile_c_online.php)
* [https://replit.com/](https://replit.com/)
* [https://www.jdoodle.com/c-online-compiler](https://www.jdoodle.com/c-online-compiler)
* [https://www.onlinegdb.com/online_c_compiler](https://www.onlinegdb.com/online_c_compiler)
Page 1 End.
* [https://www.codechef.com/ide](https://www.codechef.com/ide)
* [https://www.programiz.com/c-programming/online-compiler/](https://www.programiz.com/c-programming/online-compiler/).
I recommend [https://exercism.org](https://exercism.org) as the platform to
learn programming, including C, and practice with a community of intrinsically
motivated developers.
### Reference Books
* C Programming Language by Kernighan and Ritchie.
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[](https://app.netlify.com/sites/learntosolveit/deploys)
[](http://www.learntosolveit.com/?badge=latest)
## Author
* Senthil Kumaran
* Email: [senthil@uthcode.com](mailto:senthil@uthcode.com)
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* Blog: [https://senthil.learntosolveit.com](https://senthil.learntosolveit.com)