Write a C program that displays contents of a given file like ‘more’ utility in Linux
Write a C program that displays contents of given line page by page. Given number of lines to show as ‘n’ at a time and a file name, the program should first show n lines, then wait for user to hit a key before showing next n lines and so on.
We strongly recommend to minimize the browser and try this yourself first.
We can open the given file and print contents of files. While printing, we can keep track of number of newline characters. If the number of newline characters become n, we wait for the user to press a key before showing next n lines.
Following is the requires C program.
// C program to show contents of a file with breaks #include <stdio.h> // This function displays a given file with breaks of // given line numbers. void show( char *fname, int n) { // Open given file FILE *fp = fopen (fname, "r" ); int curr_lines = 0, ch; // If not able to open file if (fp == NULL) { printf ( "File doesn't exist\n" ); return ; } // Read contents of file while ((ch = fgetc (fp)) != EOF) { // print current character putchar (ch); // If current character is a new line character, // then increment count of current lines if (ch == '\n' ) { curr_lines++; // If count of current lines reaches limit, then // wait for user to enter a key if (curr_lines == n) { curr_lines = 0; getchar (); } } } fclose (fp); } // Driver program to test above function int main() { char fname[] = "A.CPP" ; int n = 25; show(fname, n); return 0; } |
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