C比较文件相同

直接上代码：

#include<stdio.h>
#include <windows.h>

int main()
{
	FILE *f1,*f2;
	char ch1,ch2;
	char fileName1[100],fileName2[100];

 	printf("Enter first filename :\n");
 	scanf("%s",fileName1);

	printf("Enter second filename :\n");
 	scanf("%s",fileName2);

	if(((f1=fopen(fileName1,"r"))==0) || ((f2=fopen(fileName2,"r"))==0))
	{
		printf("Files do not exist!!\n");
		return 0;
	}
	do
	{
		ch1=fgetc(f1);
		ch2=fgetc(f2);
		if(ch1!=ch2)
		{
			printf("different！\n") ;
			return 0;
		}
	}while(ch1!=EOF || ch2!=EOF);
	printf("same！\n");

	system("pause");

	return 0;
}