Open a file in reading mode. If the file exists, then write a code to count the number of lines in a file. If the file does not exist, it displays an error that the file is not there.
The file is a collection of records (or) It is a place on the hard disk where data is stored permanently.
Following are the operations performed on files −
Naming the file
Opening the file
Reading from the file
Writing into the file
Closing the file
Syntax
Following is the syntax for opening and naming a file −
1) FILE *File pointer;
Eg : FILE * fptr;
2) File pointer = fopen ("File name", "mode");
Eg : fptr = fopen ("sample.txt", "r");
FILE *fp;
fp = fopen ("sample.txt", "w");Program 1
#include <stdio.h>
#define FILENAME "Employee Details.txt"
int main(){
FILE *fp;
char ch;
int linesCount=0;
//open file in read more
fp=fopen(FILENAME,"r");
if(fp==NULL){
printf("File \"%s\" does not exist!!!\n",FILENAME);
return -1;
}
//read character by character and check for new line
while((ch=getc(fp))!=EOF){
if(ch=='\n')
linesCount++;
}
//close the file
fclose(fp);
//print number of lines
printf("Total number of lines are: %d\n",linesCount);
return 0;
}Output
Total number of lines are: 3 Note: employee details.txt file consist of Pinky 20 5000.000000 Here total number of line are 3
Program 2
In this program, we will see how to find a total number of lines in a file that does not exist in the folder.
#include <stdio.h>
#define FILENAME "sample.txt"
int main(){
FILE *fp;
char ch;
int linesCount=0;
//open file in write mode
fp=fopen(FILENAME,"w");
printf ("enter text press ctrl+z of the end");
while ((ch = getchar( ))!=EOF){
fputc(ch, fp);
}
fclose(fp);
//open file in read more
fp=fopen(FILENAME,"r");
if(fp==NULL){
printf("File \"%s\" does not exist!!!\n",FILENAME);
return -1;
}
//read character by character and check for new line
while((ch=getc(fp))!=EOF){
if(ch=='\n')
linesCount++;
}
//close the file
fclose(fp);
//print number of lines
printf("Total number of lines are: %d\n",linesCount);
return 0;
}Output
enter text press ctrl+z of the end Hi welcome to Tutorials Point C Pogramming Question & answers ^Z Total number of lines are: 2