The function FILE *tmpfile(void); creates a temporary binary file in update mode. It created a temporary file with unique file name. Temporary file gets deleted automatically when the stream associated with it is closed using fclose or when program terminates normally.
Function prototype of tmpfile
FILE *tmpfile(void);
- NONE
Return value of tmpfile
On success, this function returns a FILE pointer associated with the temporary file otherwise it returns NULL in case of failure.
C program using tmpfile function
The following program shows the use of tmpfile function to create a temporary file. This program performs standard input and output operations on temporary file like any other stream.
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#include <stdio.h>
int main (){
int c, counter = 0;
FILE *file;
/* Create a temporary file */
file = tmpfile();
fputs("tmpfile C Standard Library function", file);
/* Rewind file pointer */
rewind(file);
while(!feof(file)){
c = fgetc(file);
printf("%c", c);
}
fclose(file);
return(0);
}
Output
tmpfile C Standard Library function