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C???C++??????

C??????

1. ????

?C??????????????fopen()???????????????????FILE *fp????????????????

2. ????

???????\???????????\?????\\????????????????

• ????"r"??????????
• ????"w"???????????????????
• ????"a"???????????????????????
• ????"r+"??????????
• ??????"w+"??????????????
• ??????"a+"???????????????

??????????????"b"???????"rb"??????????"wb"??????????

3. ????

??fclose()?????????????????????????????????????????

4. ????

• ???????fgetc()????????????feof()??????
• ???????fputc()????????????

FILE *fp = fopen("file.txt", "r");
char ch;
while (!feof(fp)) {
    ch = fgetc(fp);
    // ????
}
fclose(fp);

• ???????fputs()?fprintf()???????????

5. ?????

• ????????fgets()?????????????
• ????????fputs()?fprintf()???

6. ?????

??fscanf()?fprintf()?????????????

int rollnumber, score;
char name[20];
FILE *fp = fopen("data.txt", "r");
while (!feof(fp)) {
    fscanf(fp, "%d %s %d", &rollnumber, name, &score);
}
fclose(fp);

7. ????????

• ??????rewind()????????????
• ??????feof()????????
• ??????fseek()??????????????????????
• ???????fread()?fwrite()??????????

C++????

C++?????????????????ifstream???????ofstream???????fstream?????????

1. ???????

• ifstream??????
• ofstream??????
• fstream??????

2. ????

??open()????????????

ofstream file;
file.open("file.txt", ios::out | ios::app | ios::binary);
// ?
fstream file("file.txt", ios::out);

3. ????

??close()???????

ofstream file;
file.open("file.txt");
// ...??
file.close();

4. ????

• ???????<<?>>????????
• ????????put()?get()?read()?write()???

ofstream file("file.bin", ios::out | ios::app);
file.put('A');
file.close();
ifstream file("file.bin", ios::binary);
char ch;
file.get(ch);

5. ????

• eof()`??????????
• seekg()?seekp()????????
• read()?write()???????

fstream file("file.txt");
file.seekg(5, ios::beg); // ????5???
string str(10);
file >> str;

??????????????????????????????????

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