C语言文件操作函数大全-创新互联
fgetc_fputc
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{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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