Issues opening a file in C

[79wjd]

FILE *file = fopen(filename, "w+");

I need to open a file and overwrite whatever's in it, which the above should do. But it just ends up appending the file with whatever I print to it next. 

[Mr_KoKa]

http://www.cplusplus.com/reference/cstdio/fopen/

[79wjd]

http://www.cplusplus.com/reference/cstdio/fopen/

I've read through that, and what I did should open the file with the stream at the beginning of the file and ready to overwrite whatever's in the file. 

[DevBlox]

You are one character away from being correct.

FILE *file = fopen(filename, "w");

This is how it should go.

 

 

I've read through that, and what I did should open the file with the stream at the beginning of the file and ready to overwrite whatever's in the file.

That's wrong because if there is less content than there was before, you will have a trail of garbage from the last write. If you try to fix it by overwriting every following character, let's say, with space, you will waste space and compute resources, nobody wants/cares about a file half full with trailing spaces.

[79wjd]

You are one character away from being correct.

FILE *file = fopen(filename, "w");

This is how it should go.

 

That's wrong because if there is less content than there was before, you will have a trail of garbage from the last write. If you try to fix it by overwriting every following character, let's say, with space, you will waste space and compute resources, nobody wants/cares about a file half full with trailing spaces.

that still doesn't overwrite the file, it just appends (prepends*, like w+) to it.

[Nineshadow]

that still doesn't overwrite the file, it just appends (prepends*, like w+) to it.

Are you sure?

I have this code :

 

#include <stdio.h>int main(){    FILE *f = fopen("text.txt", "w");    fprintf(f, "Hello there world ");}

And it works just like you describe it should.

[kiran]

Are you sure?

I have this code :

 

#include <stdio.h>int main(){    FILE *f = fopen("text.txt", "w");    fprintf(f, "Hello there world ");}

And it works just like you describe it should.

 

"w+" access mode should also create a new file on each run. Try to post the complete code you are using or at least the part where it writes content to the file.