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tmpfile() function in C

Last Updated : 04 Sep, 2017
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In C Programming Language, the tmpfile() function is used to produce/create a temporary file.
  • tmpfile() function is defined in the "stdio.h" header file.
  • The created temporary file will automatically be deleted after the termination of program.
  • It opens file in binary update mode i.e., wb+ mode.
  • The syntax of tmpfile() function is: 
    FILE *tmpfile(void)
  • The tmpfile() function always returns a pointer after the creation of file to the temporary file. If by chance temporary file can not be created, then the tmpfile() function returns NULL pointer.
C 
// C program to demonstrate working of tmpfile()
#include <stdio.h>
int main()
{
    char str[] = "Hello GeeksforGeeks";
    int i = 0;

    FILE* tmp = tmpfile();
    if (tmp == NULL)
    {
        puts("Unable to create temp file");
        return 0;
    }

    puts("Temporary file is created\n");
    while (str[i] != '&#092;&#048;')
    {
        fputc(str[i], tmp);
        i++;
    }

    // rewind() function sets the file pointer
    // at the beginning of the stream.
    rewind(tmp);

    while (!feof(tmp))
        putchar(fgetc(tmp));
}
Output: 
Temporary file is created
Hello GeeksforGeeks

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Bishal Kumar Dubey
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