How do I clear the contents of a file using c?
- by Eddy
I'm writing some code so that at each iteration of a for loop it runs a functions which writes data into a file, like this:
int main()
{
int i;
/* Write data to file 100 times */
for(i = 0; i < 100; i++) writedata();
return 0;
}
void writedata()
{
/* Create file for displaying output */
FILE *data;
data = fopen("output.dat", "a");
/* do other stuff */
...
}
How do I get it so that when I run the program it will delete the file contents at the beginning of the program, but after that it will append data to the file? I know that using the "w" identifier in fopen() will open a new file that's empty, but I want to be able to 'append' data to the file each time it goes through the 'writedata()' function, hence the use of the "a" identifier.
