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FILE *fopen(char *pname,char *mode)
//定义一个名叫fp文件指针FILE *fp；//判断按读方式打开一个名叫test的文件是否失败if((fp=fopen（"test"，"r"）) == NULL)//打开操作不成功{printf("The file can not be opened.\n")；exit(1);//结束程序的执行}
int fclose(FILE *fp)；
int n=fclose(fp);
int fgetc(FILE *fp)；
//程序名为：display.c//执行时可用：display filename1 形式的命令行运行。显示文件filename1中的内容。例如，执行命令行display display.c将在屏幕上显示display的原代码。//File display program.void main(int argc,char *argv[]) //命令行参数{int ch;//定义文件类型指针FILE *fp;//判断命令行是否正确if(argc!=2){printf("Error format,Usage: display filename1\n");return; //键入了错误的命令行，结束程序的执行}//按读方式打开由argv[1]指出的文件if((fp=fopen(argv[1],"r"))==NULL){printf("The file <%s> can not be opened.\n",argv[1]);//打开操作不成功return;//结束程序的执行}//成功打开了argv[1]所指文件ch=fgetc(fp); //从fp所指文件的当前指针位置读取一个字符while(ch!=EOF) //判断刚读取的字符是否是文件结束符{putchar(ch); //若不是结束符，将它输出到屏幕上显示ch=fgetc(fp); //继续从fp所指文件中读取下一个字符} //完成将fp所指文件的内容输出到屏幕上显示fclose(fp); //关闭fp所指文件}
int fputc(int ch,FILE *fp)
//程序名为：copyfile.c//执行时可用：copyfile filename1 filename2形式的命令行运行，将文件filename1中的内容复制到文件filename2中去。//file copy program.void main(int argc,char *argv[]) //命令行参数{int ch;FILE *in,*out; //定义in和out两个文件类型指针if(argc!=3) //判断命令行是否正确{printf("Error in format,Usage: copyfile filename1 filename2\n");return; //命令行错，结束程序的执行}//按读方式打开由argv[1]指出的文件if((in=fopen(argv[1],"r"))==NULL){printf("The file <%s> can not be opened.\n",argv[1]);return; //打开失败，结束程序的执行}//成功打开了argv[1]所指文件，再//按写方式打开由argv[2]指出的文件if((out=fopen(argv[2],"w"))==NULL){printf("The file %s can not be opened.\n",argv[2]);return; //打开失败，结束程序的执行}//成功打开了argv[2]所指文件ch=fgetc(in); //从in所指文件的当前指针位置读取一个字符while(ch!=EOF) //判断刚读取的字符是否是文件结束符{fputc(ch,out); //若不是结束符，将它写入out所指文件ch=fgetc(in); //继续从in所指文件中读取下一个字符} //完成将in所指文件的内容写入（复制）到out所指文件中fclose(in); //关闭in所指文件fclose(out); //关闭out所指文件}
//程序名为：dumpf.c//执行时可用：dumpf filename1 形式的命令行运行。// File dump program.void main(int argc,char *argv[]){char str[9];int ch,count,i;FILE *fp;if(argc!=2){printf("Error format,Usage: dumpf filename\n");return;}if((fp=fopen(argv[1],"r"))==NULL){printf("The file %s can not be opened.\n",argv[1]);return;}count=0;do{i=0;//按八进制输出第一列，作为一行八个字节的首地址printf("%06o: ",count*8);do{// 从打开的文件中读取一个字符ch=fgetc(fp);// 按十进制方式输出这个字符的ASCII码printf("%4d",ch);// 如果是不可示字符就用"#"字符代替if(ch<' '||ch>'~') str[i]='#';// 如果是可示字符，就将它存入数组str以便形成字符串else str[i]=ch;// 保证每一行输出八个字符if(++i==8) break;}while(ch!=EOF); // 遇到文件尾标志，结束读文件操作str[i]='\0'; // 在数组str加字符串结束标志for(;i<8;i++) printf(" "); // 一行不足八个字符用空格填充printf(" %s\n",str); // 输出字符串count++; // 准备输出下一行}while(ch!=EOF); // 直到文件结束fclose(fp); // 关闭fp所指文件}
char *fgets(char *str,int n,FILE *fp)
int fputs(char *str,FILE *fp)
//程序名：linkfile.c//执行时可用：linkfile filename1 filename2形式的命令行运行，将文件filename2的内容附加在文件filename1之后。// file linked program.void main(int argc,char *argv[]){char buffer[SIZE];FILE *fp1,*fp2;if(argc!=3){printf("Usage: linkfile filename1 filename2\n");return;}// 按追加方式打开argv[1] 所指文件if((fp1=fopen(argv[1],"a"))==NULL){printf("The file %s can not be opened.\n",argv[1]);return;}if((fp2=fopen(argv[2],"r"))==NULL){printf("The file %s can not be opened.\n",argv[2]);return;}// 读入一行立即写出，直到文件结束while(fgets(buffer,SIZE,fp1)!=NULL)printf("%s\n",buffer);while(fgets(buffer,SIZE,fp2)!=NULL)fputs(buffer,fp1);fclose(fp1);fclose(fp2);if((fp1=fopen(argv[1],"r"))==NULL){printf("The file %s can not be opened.\n",argv[1]);return;}while(fgets(buffer,SIZE,fp1)!=NULL)printf("%s\n",buffer);fclose(fp1);}
int fprintf(FILE *fp,char *format,arg_list)
//存储文件名：save.txt//程序代码如下：// file display program.void main(){char name[10];int nAge,nClass;long number;FILE *fp;if((fp=fopen("student.txt","w"))==NULL){printf("The file %s can not be opened.\n","student.txt");return;}fscanf(stdin,"%s %d %d %ld",name,&nClass,&nAge,&number);fprintf(fp,"%s %5d %4d %8ld",name,nClass,nAge,number);fclose(fp);if((fp=fopen("student.txt","r"))==NULL){printf("The file %s can not be opened.\n","student.txt");return;}fscanf(fp,"%s %d %d %ld",name,&nClass,&nAge,&number);printf("name nClass nAge number\n");fprintf(stdout,"%-10s%-8d%-6d%-8ld\n",name,nClass,nAge,number);fclose(fp);}
int fread(void *buffer,unsigned sife,unsigned count,FILE *fp)
int fwrite(void *buffer,unsigned sife,unsigned count,FILE *fp)
struct worker{ int number;char name[20];int age;};void main(){struct worker wk;int n;FILE *in,*out;if((in=fopen("file1.txt","rb"))==NULL){printf("The file %s can not be opened.\n","file1.txt");return;}if((out=fopen("file2.txt","wb"))==NULL){printf("The file %s can not be opened.\n","file2.txt");return;}while(fread(&wk,sizeof(struct worker),1,in)==1)fwrite(&wk,sizeof(struct worker),1,out);fclose(in);fclose(out);}
int getw(FILE *fp)
void main(int argc,char *argv[]){int i,sum=0;FILE *fp;if(argc!=2){printf("Command error,Usage: readfile filename\n");exit(1);}if(!(fp=fopen(argv[1],"rb"))){printf("The file %s can not be opened.\n",argv[1]);exit(1);}for(i=1;i<=10;i++) sum+=getw(fp);printf("The sum is %d\n",sum);fclose(fp);}
int putw(int n,FILE *fp)
void main(int argc,char *argv[]){int i;FILE *fp;if(argc!=2){printf("Command error,Usage: writefile filename\n");return;}if(!(fp=fopen(argv[1],"wb"))){printf("The file %s can not be opened.\n",argv[1]);return;}for(i=1;i<=10;i++) printf("%d\n", putw(i,fp));fclose(fp);}
int feof(FILE *fp)
void main(int argc,char *argv[]){FILE *in,*out;char ch;if(argc!=3){printf("Usage: copyfile filename1 filename2\n");return;}if((in=fopen(argv[1],"rb"))==NULL){printf("The file %s can not be opened.\n",argv[1]);return;}if((out=fopen(argv[2],"wb"))==NULL){printf("The file %s can not be opened.\n",argv[2]);return;}while(!feof(in)){ch=fgetc(in);if(ferror(in)){printf("read error!\n");clearerr(in);}else{fputc(ch,out);if(ferror(out)){printf("write error!\n");clearerr(out);}}}fclose(in);fclose(out);}
int ferror(FILE *fp)
void clearerr(FILE *fp)
void main(int argc,char *argv[]){FILE *in,*out;char ch;if(argc!=3){printf("Usage: copyfile filename1 filename2\n");return;}if((in=fopen(argv[1],"rb"))==NULL){printf("The file %s can not be opened.\n",argv[1]);return;}if((out=fopen(argv[2],"wb"))==NULL){printf("The file %s can not be opened.\n",argv[2]);return;}while(!feof(in)){ch=fgetc(in);if(ferror(in)){printf("read error!\n");clearerr(in);}else{fputc(ch,out);if(ferror(out)){printf("write error!\n");clearerr(out);}}}fclose(in);fclose(out);}
long ftell(FILE *fp)
void rewind(FILE *fp)
void main(){FILE *in,*out;in=fopen("filename1","r");out=fopen("filename2","w");while(!feof(in)) fputc(fgetc(in),out);rewind(out);while(!feof(in)) putchar(fgetc(in));fclose(in);fclose(out);}
int fseek(FILE *fp,long offset,int base)
struct std_type{int num;char name[20];int age;char class;}stud;int cstufile(){int i;FILE *fp;if((fp=fopen("stufile","wb"))==NULL){printf("The file can't be opened for write.\n");return 0;}for(i=1;i<=100;i++){stud.num=i;strcpy(stud.name,"aaaa");stud.age=17;stud.class='8';fwrite(&stud,sizeof(struct std_type),1,fp);}fclose(fp);return 1;}void main(){int n;FILE *fp;if(cstufile()==0) return;if((fp=fopen("stufile","rb"))==NULL){printf("The file can not be opened.\n");return;}for(n=0;n<100;n+=2){fseek(fp,n*sizeof(struct std_type),SEEK_SET);fread(&stud,sizeof(struct std_type),1,fp);printf("%10d%20s%10d%4c\n",stud.num,stud.name,stud.age,stud.class);}fclose(fp);}
void exit(int status)
int feof(FILE *fp)
end
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