Mega Code Archive
Freopen
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//Header file: #include <stdio.h>
//Declaration: FILE *freopen(const char *fname, const char *mode, FILE *stream);
//Return: returns a pointer to stream on success or a null pointer on failure.
//Legal Values for the mode Parameter
//Mode Meaning
//"r": Open text file for reading
//"w": Create a text file for writing
//"a": Append to text file
//"rb": Open binary file for reading
//"wb": Create binary file for writing
//"ab": Append to a binary file
//"r+": Open text file for read/write
//"w+": Create text file for read/write
//"a+": Open text file for read/write
//"rb+" or "r+b": Open binary file for read/write
//"wb+" or "w+b": Create binary file for read/write
//"ab+" or "a+b": Open binary file for read/write
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
FILE *fp;
printf("This will display on the screen.\n");
if((fp=freopen("OUT", "w" ,stdout))==NULL) {
printf("Cannot open file.\n");
exit(1);
}
printf("This will be written to the file OUT.");
fclose(fp);
return 0;
}
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