Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Write a C program that displays contents of a given file like 'more' utility in Linux
Here, we will write a C program that will display the contents of a file page by page as displayed in Linux using the more command.
This program will show a specific number of lines on the screen first and then wait for the user to hit enter to move to the next page i.e. next set of n lines.
For displaying the content of the file like this we will open the file and print its contents. And maintain a counter for new lines in the file. When this counter reaches n, we will read a key pressed by the user to print further new n lines.
Example
#include <stdio.h>
void displaytext(char *fname, int n) {
FILE *fp = fopen(fname, "r");
int lineCount = 0, ch;
if (fp == NULL) {
printf("No such file exists\n");
return;
}
while ((ch = fgetc(fp)) != EOF){
putchar(ch);
if (ch == '\n'){
lineCount++;
if (lineCount == n){
lineCount = 0;
getchar();
}
}
}
fclose(fp);
}
int main() {
char fname[] = "main.CPP";
int n = 10;
displaytext(fname, n);
return 0;
}Output
No such file exists
Updated on: 17-Jul-2020
164 Views
Advertisements