CODEWITHSUNDEEP
carraysfilenewlinescanf
Sanket Lad
Sanket Lad

Reputation: 351

How to detect a new line of any file using C program

I am reading a file of integers. I want to save integers from each line to a new array. For this I want to detect a new line of a file. If anybody knows this please help.

The file to be read is as follows

1 2 4 5 6
7 3 2 5 
8 3 
9 7 6 2

Upvotes: 2

Views: 47261

Answers (6)

Priyanka Avhad
Priyanka Avhad

Reputation: 11

#include<stdio.h>
void main()
{
    FILE *p;
    int n;
    int s=0;
    int a[10];
    p=fopen("C:\\numb.txt","r");
    if(p!=NULL)
        printf("file opened");

    while((n=getc(p))!=EOF)
    {   if(n!=NULL && n!='\n')
      {
        printf("\n%d",n);
        a[s]=n;
        ++s;
      }
    }
fclose(p);
getchar();
}

I'm not sure of the int to char and vice versa conversion but program works for non zero numbers. I tried on visual basic.

Upvotes: 0

radioing
radioing

Reputation: 13

Using getc() for this action is fine but do not forget that getc() returns type is int. Retype to char "works" but you can have a problem with non strict-ASCII input file because EOF = -1 = 0xFF after retype to char (on most C compilers), i.e. 0xFF characters are detected as EOF.

Upvotes: 0

unwind
unwind

Reputation: 399743

Use fgets() to read a single line of input at a time. Then use strtol() to parse off an integer, using its "end pointer" feature to figure out where to try again, and loop until you've parsed all the values.

Upvotes: 0

Avinash
Avinash

Reputation: 13257

#include <stdio.h>
int main ( int argc, char **argv ) {
    FILE *fp = fopen ( "d:\\abc.txt", "r");
    char line[1024];
    char ch = getc ( fp );
    int index = 0;
    while ( ch != EOF ) {
        if ( ch != '\n'){
            line[index++] = ch;
        }else {
            line[index] = '\0';
            index = 0;

            printf ( "%s\n", line );
        }
        ch = getc ( fp );
    }


    fclose ( fp );

    return 0;
}

Upvotes: 3

Reza
Reza

Reputation: 111

If you use reading char by char then recognizing whitespace with '32' and 'enter' by '13' and/or '10'

Upvotes: -1

Oliver Charlesworth
Oliver Charlesworth

Reputation: 272467

Why not use fgets() to get one line at a time from the file? You can then use sscanf() instead of fscanf() to extract the integers.

Upvotes: 9

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