C语言文件写入运用

#include<stdio.h>

int main () {
/*	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
	int a;
	scanf("%d", &a);
	printf(,"%d",a);*/
	
	
/*	FILE *fin, *fout;
	fin = fopen("input.txt", "rb");
	fout = fopen("output.txt", "wb");
	int a;
	fscanf(fin, "%d", &a);
	fprintf(fout ,"%d",a);
	fclose(fin);
	fclose(fout);
	*/
	
	return 0;
}