1209 作业

1.思维导图

作业

1、使用这fscanf和fprintf两个函数实现文件的拷贝。

#include <myhead.h>
int main(int argc, const char *argv[])
{
	FILE *fp1 = fopen("1.txt","r");
	FILE *fp2 = fopen("2.txt","w");
	if(fp1==NULL || fp2==NULL)
	{
		perror("fopen");
		return -1;
	}

	char buff[1024];
	while(1)
	{
		if(fscanf(fp1,"%s",buff)==EOF)
		{
			break;
		}
		fprintf(fp2,"%s",buff);
	}
	fclose(fp1);
	fclose(fp2);

	return 0;
}

2、fwrite和fread实现文件拷贝。

#include <myhead.h>
int main(int argc, const char *argv[])
{
	FILE *fp1 = fopen("1.txt","r");
	FILE *fp2 = fopen("2.txt","w");
	if(NULL==fp1 || NULL==fp2)
	{
		perror("fopen");
		return -1;
	}

	char buff[1024];
	int  i=0;
	while(1)
	{
		fseek(fp1,i*sizeof(buff),SEEK_SET);
		int res = fread(buff,1,sizeof(buff),fp1);
		if(res==0)
		{
			break;
		}
		fwrite(buff,1,res,fp2);
		fflush(fp1);
		i++;
	}
	fclose(fp1);
	fclose(fp2);
	return 0;
}

3、登录注册实现一遍。

#include <myhead.h>
int regist(const char *File)
{
	char uer[20],pow[20];

	printf("请输入注册账号：");
	fgets(uer,sizeof(uer),stdin);
	printf("请输入注册密码：");
	fgets(pow,sizeof(pow),stdin);
	uer[strlen(uer)-1] = '\0';
	pow[strlen(pow)-1] = '\0';


	FILE *fp = fopen(File,"a");
	if(fp==NULL)
	{
		perror("fopen");
		return -1;
	}
	
	fprintf(fp,"%s %s\n",uer,pow);
	fclose(fp);
	return 0;
}
int login(const char *File)
{
	char duer[20],dpow[20];
	char uer[20],pow[20];
	printf("请输入登录账号：");
	fgets(duer,sizeof(duer),stdin);
	printf("请输入登录密码：");
	fgets(dpow,sizeof(dpow),stdin);
	duer[strlen(duer)-1] = '\0';
	dpow[strlen(dpow)-1] = '\0';
	
	FILE *fp = fopen(File,"r");
	if(fp==NULL)
	{
		perror("fopen");
		return -1;
	}
	while(1)
	{
		int res = fscanf(fp,"%s %s",uer,pow);
		if(res==EOF)
		{
			break;
		}
		if(strcmp(uer,duer)==0 || strcmp(pow,dpow)==0)
		{
			printf("登陆成功\n");
			return 0;
		}
	}
	printf("登录失败\n");
	fclose(fp);
	return -1;
}


int main(int argc, const char *argv[])
{
	if(argc!=2)
	{
		printf("参数错误\n");
		return -1;
	}
	while(1)
	{	
		printf("\t\t\t1.注册\n");
		printf("\t\t\t2.登录\n");
		printf("\t\t\t0.退出\n");
		printf("请输入您的选项：");
		int value;
		scanf("%d",&value);
		getchar();
		switch(value)
		{
		case 1:
			{
				regist(argv[1]);
			}
			break;
		case 2:
			{
				login(argv[1]);
			}
			break;
		case 0:exit(0);
		default:printf("您输入有误，请重新输入:\n");continue;
		}
	}
	return 0;
}