fscanf与fprintf的使用

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void main(void)
{
	FILE *fp;
	char str[100];
	int a[3];
	int i=0,i1,i2,i3,i4,i5,i6;
	fp=fopen("a.txt","r");
	if (fp==NULL)
	{
	printf("can not open file\n");
	return;
	}
	fscanf(fp,"%d %d %d",&a[0],&a[1],&a[2]);

	printf("%d,%d,%d\n",a[0],a[1],a[2]);
	fclose(fp);
	fp=fopen("a.txt","a");
	printf(" 输入一6个数字\n");
	scanf("%d %d %d %d %d %d",&i1,&i2,&i3,&i4,&i5,&i6);

	fprintf(fp,"%d\t%d\t%d\t%d\t%d\t%d\n",i1,i2,i3,i4,i5,i6);
	fclose(fp);
   
}