Лекция 21 - Файлов вход/изход част 2

// files.c
#include <stdio.h>

int main() {  
  FILE* my_file;

  my_file = fopen("./out.txt", "a"); // w a

  if(my_file != NULL) {
    // scanf
    // gets, fgets
    // getc, getchar

    // fscanf
    // fgets
    // fgetc

    /*for(int i=0; i<100;i++) {
      char c = fgetc(my_file);
      printf("c = \"%c\"\n", c);
    }*/

    /*    c = fgetc(my_file);
    printf("c = \"%c\"\n", c);
    c = fgetc(my_file);
    printf("c = \"%c\"\n", c);
    c = fgetc(my_file);
    printf("c = \"%c\"\n", c);*/

    /*for(;;) {
      char c = fgetc(my_file);

      if(c != EOF) {
        putchar(c);
        //printf("%d", c);
      } else {
        puts("\nfile end has been reached\n");
        break;
      }
    }*/

    /*for(;;) {
      char c[10];

      if(fgets(c, 10, my_file) != NULL) {
//        puts(c);
        printf("%s", c);
      } else {
        puts("\nfile end has been reached\n");
        break;
      }
    }*/

    /*char str[10];
    int num;
    float fraction;

    for(;;) {
      if(fscanf(my_file, "%s%d%f", str, &num, &fraction) == EOF) {
        break;
      }
      printf("Read: %s %d %f\n", str, num, fraction);
    }*/

    // fputc
    // fputs
    // fprintf

    if(fputc('c', my_file) == EOF) {
      puts("ERROR WRITING TO FILE!");
    }

    fputc('\n', my_file);
    //fprintf(my_file, "%c", '\n');

    fputs("I AM GROOT\n", my_file);

    fprintf(my_file, "%s %d\n", "Hello", 123);

    fclose(my_file);
  } else {
    printf("Failed to open file!\n");
  }

  return 0;
}

// test.txt
Hello 123 123.456
Goodbye 789 789.123

// files2.c
#include <stdio.h>

int main() {
  FILE* outFile;
  FILE* logFile;

  outFile = fopen("out2.txt", "w");
  logFile = fopen("log.txt", "a");

  if(outFile != NULL && logFile != NULL) {
    char str[10];
    while(fgets(str, 10, stdin) != NULL) {
      fputs(str, outFile);
      fputc('\n', outFile);

      fprintf(logFile, "Read name: %s\n", str);
    }

    fclose(outFile);
    fclose(logFile);
  }
  return 0;
}

// files3.c

#include <stdio.h>

struct person_t {
  char first_name[15];
  unsigned int age;
  char last_name[15];
};

int main() {
  FILE* outFile;

  outFile = fopen("out3.txt", "r");

  if(outFile != NULL) {
    /*for(int i=10000; i<10005; i++) {
      //fprintf(outFile, "%d\n", i);
      fwrite(&i, sizeof(int), 1, outFile);
    }*/

    /*for(;;) {
      int i;
      fread(&i, sizeof(int), 1, outFile);
      if(feof(outFile)) {
        break;
      }
      //fread(&i, sizeof(int), 1, outFile);
      printf("Read: %d\n", i);
    }*/

    //struct person_t pers = {"Hello", 19, "Godbye"};
    //fwrite(&pers, sizeof(struct person_t), 1, outFile);

    struct person_t pers;
    fread(&pers, sizeof(struct person_t), 1, outFile);

    printf("%s %s %d\n", pers.first_name, pers.last_name, pers.age);

    fclose(outFile);
  }
  return 0;
}