fgetc_fputc

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#include#includeint main()
{FILE *fp_in;
	FILE *fp_out;
	char c;
	if((fp_in=fopen("D:\\cProgram\\data_in.txt","w+"))==NULL)
	{printf("open file error!\n");
		exit(0);
	}
	c=getchar();
	while(c!='#')
	{fputc(c,fp_in);
		c=getchar();
	}
	fclose(fp_in);
	if((fp_in=fopen("D:\\cProgram\\data_in.txt","r"))==NULL)
	{printf("open file error!\n");
		exit(0);
	}
	if((fp_out=fopen("D:\\cProgram\\data_out.txt","w+"))==NULL)
	{printf("open file error!\n");
		exit(0);
	}
	
	while((c=fgetc(fp_in))!=EOF)
	{fputc(c,fp_out);
	}
	fclose(fp_in);
	fclose(fp_out);
	return 0;
}

fgets_fputs

#include#include#includeint main()
{FILE *fp_in;
	FILE *fp_out;
	char str[3][10];
	char temp[10];
	int i=0;
	int j=0;
	printf("input 3 strings\n");
	for(i=0;i<3;i++)
	{scanf("%s",str[i]);
	}
	for(i=0;i<3;i++)
	{for(j=0;j<3-i-1;j++)
		{	if(strcmp(str[j],str[j+1])>0)
			{		strcpy(temp,str[j]);
				strcpy(str[j],str[j+1]);
				strcpy(str[j+1],temp);
			}
		}
	}
	
	if((fp_in=fopen("D:\\cProgram\\data_in.txt","w+"))==NULL)
	{printf("open file error!\n");
		exit(0);
	}
	for(i=0;i<3;i++)
	{fputs(str[i],fp_in);
		fputs("\n",fp_in);
	}
	fclose(fp_in);
	
	if((fp_in=fopen("D:\\cProgram\\data_in.txt","r+"))==NULL)
	{printf("open file error!\n");
		exit(0);
	}
	if((fp_out=fopen("D:\\cProgram\\data_out.txt","w+"))==NULL)
	{printf("open file error!\n");
		exit(0);
	}
	
	while(fgets(temp,10,fp_in)!=NULL)
	{fputs(temp,fp_out);
	}
	
	fclose(fp_in);
	fclose(fp_out);
	return 0;
}

fprintf_scanf

#include#include#includeint main()
{FILE *fp_in;
	FILE *fp_out;
	char str[3][10];
	char temp[10];
	int i=0;
	int j=0;
	printf("input 3 strings\n");
	for(i=0;i<3;i++)
	{scanf("%s",str[i]);
	}
	for(i=0;i<3;i++)
	{for(j=0;j<3-i-1;j++)
		{	if(strcmp(str[j],str[j+1])>0)
			{		strcpy(temp,str[j]);
				strcpy(str[j],str[j+1]);
				strcpy(str[j+1],temp);
			}
		}
	}
	
	if((fp_in=fopen("D:\\cProgram\\data_in.txt","w+"))==NULL)
	{printf("open file error!\n");
		exit(0);
	}
	for(i=0;i<3;i++)
	{fprintf(fp_in,"%s\n",str[i]);
	}
	fclose(fp_in);
	
	if((fp_in=fopen("D:\\cProgram\\data_in.txt","r+"))==NULL)
	{printf("open file error!\n");
		exit(0);
	}
	if((fp_out=fopen("D:\\cProgram\\data_out.txt","w+"))==NULL)
	{printf("open file error!\n");
		exit(0);
	}
	
	for(i=0;i<3;i++)
	{fscanf(fp_in,"%s",temp);
		fprintf(fp_out,"%s\n",temp);
	}
	
	fclose(fp_in);
	fclose(fp_out);
	return 0;
}

fwrite_fread

#include#includestruct student
{char name[16];
	int num;
	int age;
}stu[5];

int main()
{FILE *fp;
	int i=0;
	int size=sizeof(stu[0]);
	struct student temp;
	char str[]="hello world\n";
	fwrite(str,sizeof(str),1,stdout);
	if((fp=fopen("D:\\cProgram\\student.dat","wb+"))==NULL)
	{printf("file open error!\n");
		exit(0);
	}
	
	for(i=0;i<3;i++)
	{printf("please input stu%d's name\n",i);
		scanf("%s",stu[i].name);
		printf("please input stu%d's num\n",i);
		scanf("%d",&stu[i].num);
		printf("please input stu%d's age\n",i);
		scanf("%d",&stu[i].age);
		
		fwrite(&stu[i],size,1,fp);
	}
	fclose(fp);
	
	if((fp=fopen("D:\\cProgram\\student.dat","rb+"))==NULL)
	{printf("file open error!\n");
		exit(0);
	}
	for(i=0;i<3;i++)
	{fread(&temp,size,1,fp);
		printf("stu%d:\nname:%s num:%d age:%d\n",i,stu[i].name,stu[i].num,stu[i].age);
	}
	fclose(fp);
	return 0;
}

fseek

#include#includestruct student
{char name[16];
	int num;
	int age;
};

int main()
{FILE *fp;
	struct student temp;
	int size=sizeof(temp);
	
	if((fp=fopen("D:\\cProgram\\student.dat","rb+"))==NULL)
	{printf("file open error!\n");
		exit(0);
	}
	
	fseek(fp,-size*3,2);
	fseek(fp,size,1);
	fread(&temp,size,1,fp);
	printf("name:%s num:%d age:%d",temp.name,temp.num,temp.age);
	fclose(fp);
	return 0;
}

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