C fflush function forces to write buffer content to file
Syntax
C fflush function has the following format.
int fflush(FILE *stream);Header
C fflush function is
from header file stdio.h.
Description
C fflush function forces the buffer contents to be written to the file.
It returns 0 on success or EOF on error.
Example
Force to write buffer content to file by using C fflush function.
#include <stdio.h>
#include <stdlib.h>
//from w w w . j a v a 2s .c o m
int main(void){
FILE *fp;
if((fp=fopen("test", "rb"))==NULL) {
printf("Cannot open file.\n");
exit(1);
}
char ch = 'C';
int i;
for(i=0; i<5; i++) {
fwrite(ch, sizeof(ch), 1, fp);
fflush(fp);
}
fclose(fp);
return 0;
}
Flush the buffer
#include <stdio.h>
/*from w w w . j ava 2 s.c o m*/
int main()
{
char a,b;
printf("Which character is greater?\n");
printf("Type a single character:");
a=getchar();
fflush(stdin);
printf("Type another character:");
b=getchar();
fflush(stdin);
if(a > b)
{
printf("'%c' is greater than '%c'!\n",a,b);
}
else if (b > a)
{
printf("'%c' is greater than '%c'!\n",b,a);
}
else
{
printf("Next time, don't type the same character twice.");
}
return(0);
}
The code above generates the following result.
