question about the file

**thungmail** · 03-13-2008

Code:

#include <stdio.h>
#include <stdlib.h>

/*
 * 
 */
int main(void) {    
    /* Create a file */
    FILE *file1, *file2, *file3;
    char buff[BUFSIZ];
    int cha;  
    int cha1;
    int tem  = 0;
    file1 = fopen("infile1","w");    
    /* Get charater from the file and compare to EOF */
    while( fgets(buff, sizeof(buff), stdin)) {
        tem = 0;
        while ( tem < strlen(buff) ) {           
            fputc((int)buff[tem],file1);
            tem = tem + 1;
        }
    }
    fclose(file1);  
    return 0;
}

At a line file1 = fopen("infile1","w"); arethere any modes to extend the file ( add more information into file without deleting the old information)

**tabstop** · 03-13-2008

Yes. "a".

**thungmail** · 03-13-2008

I changed as you said and everything is one line. I assume I input 2 lines of character from input and I want to get 2 lines of character in infile1.

**tabstop** · 03-13-2008

Works for me. I had to add
#include<string.h>
though.

**thungmail** · 03-13-2008

even though, I added #include<string.h>,it sitll does not work. I got one line of characters in infile1.Can you post the code up

**tabstop** · 03-13-2008

Originally Posted by thungmail

even though, I added #include<string.h>,it sitll does not work. I got one line of characters in infile1.Can you post the code up

No. I used your code. Whatever I typed I got in the file -- multiple lines until I hit EOF (ctrl-Z on this win machine; you might need ctrl-D on a *nix).

**thungmail** · 03-13-2008

If I hit EOF (ctrl-Z on win machine) i got nothing
If I hit Ctrl-C on win machine I got a single line
I switch to linux and I got what i want. I dont understand

**tabstop** · 03-13-2008

When doing this from the keyboard, ^Z has to be on a line by itself. You can also redirect a file from the command line.

**vart** · 03-14-2008

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
 * 
 */
int main(void) {    
    /* Create a file */
    FILE *file1;
    char buff[BUFSIZ];
    file1 = fopen("infile1","a");    
    /* Get charater from the file and compare to EOF */
    while( fgets(buff, sizeof(buff), stdin)) {
        size_t tem = 0;
        while ( tem < strlen(buff) ) {           
            fputc((int)buff[tem],file1);
            tem = tem + 1;
        }
    }
    fclose(file1);  
    return 0;
}

Input:

Code:

abc
def
^Z

Resulting file

Code:

abc
def

MSVC++2008 Express

**thungmail** · 03-14-2008

after that how can I make "infile1" file empty

**vart** · 03-14-2008

open it with "w"

**thungmail** · 03-14-2008

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
 * 
 */
int main(void) {    
    /* Create a file */
    FILE *file1;
    char buff[BUFSIZ];
    file1 = fopen("infile1","a");    
    /* Get charater from the file and compare to EOF */
    while( fgets(buff, sizeof(buff), stdin)) {
        size_t tem = 0;
        while ( tem < strlen(buff) ) {           
            fputc((int)buff[tem],file1);
            tem = tem + 1;
        }
    }
    fclose(file1);
    file1 = fopen("infile1","w");      
    return 0;
}

can i put at then end ( the red line)

**vart** · 03-14-2008

yes - but it means - after you program is finished your file will be empty...
and do not forget to close it as well

**thungmail** · 03-14-2008

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
 * 
 */
int main(void) {    
    /* Create a file */
    FILE *file1;
    char buff[BUFSIZ];
    file1 = fopen("infile1","a");    
    /* Get charater from the file and compare to EOF */
    while( fgets(buff, sizeof(buff), stdin)) {
        size_t tem = 0;
        while ( tem < strlen(buff) ) {           
            fputc((int)buff[tem],file1);
            tem = tem + 1;
        }
    }
    fclose(file1);
    file1 = fopen("infile1","w");      
    fclose(file1);
    return 0;
}

so is it better now ?

**xuftugulus** · 03-14-2008

Save your computer some CPU cycles, and write the best version of this program.

Code:

int main(void) {
    return 0;
}

because you just wrote a program that writes a file and deletes the written file,
so why have a program within main anyway?

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