C Tutorial/stdio.h/fflush
fflush
Item Value Header
- include <stdio.h>
Declaration int fflush(FILE *stream); Function force the buffer contents to be written to the file. Return 0 on success or EOF on error.
#include <stdio.h>
#include <stdlib.h>
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>
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);
}Which character is greater?
Type a single character:2
Type another character:"2" is greater than "
"!
