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My program don't read all lines of a text file

This is a discussion on My program don't read all lines of a text file within the C Programming forums, part of the General Programming Boards category; I don't know why my program is reading only first line. The text.file has 2 lines actually. The first line ...

  1. #1
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    My program don't read all lines of a text file

    I don't know why my program is reading only first line. The text.file has 2 lines actually.

    The first line is printing.

    But the second line is not printing
    The output is always:

    The first line is printing.

    Here is my program:

    Code:
    #include<stdio.h>
    int main(){
    
    
        FILE *in=fopen("satu.txt","rt");
        char hello[100];
        
        fgets(hello,60,in); /*what is the use of in? Why writing in this format?*/
        
        printf("first line of \"text.txt\": %s", hello); 
        
        fclose(in); /*closing file*/
    
    
        return 0;
    
    
    
    
    }
    I am now learning how to read from a file. But here I don't know what is the use of in . I found this in a tutorial. If I delete it, the program doesn't work.
    Last edited by Netcode; 04-13-2012 at 07:24 PM.

  2. #2
    Registered User camel-man's Avatar
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    well to start, "in" is the name of the FILE pointer, so without it there will be syntax errors. Also, are you sure you mean "rt" for the mode or do you mean "r+"?
    Netcode likes this.

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    Quote Originally Posted by camel-man View Post
    well to start, "in" is the name of the FILE pointer, so without it there will be syntax errors. Also, are you sure you mean "rt" for the mode or do you mean "r+"?
    I am not sure. I saw that wt is used for writing in a new file. So, might be rt is used for reading. What is the use of r++?

  4. #4
    Registered User camel-man's Avatar
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    r - open for reading
    w - open for writing (file need not exist)
    a - open for appending (file need not exist)
    r+ - open for reading and writing, start at beginning
    w+ - open for reading and writing (overwrite file)
    a+ - open for reading and writing (append if file exists)

  5. #5
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    Quote Originally Posted by camel-man View Post
    r - open for reading
    w - open for writing (file need not exist)
    a - open for appending (file need not exist)
    r+ - open for reading and writing, start at beginning
    w+ - open for reading and writing (overwrite file)
    a+ - open for reading and writing (append if file exists)
    Thank you. I changed rt to r+. But still the program is reading only the first line.

  6. #6
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    fgets stops reading after new line or EOF, which ever comes first. If you want to read more than one line, you have to use a loop.

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