Connecting to the real world: files and streams M7 Test

Connecting to the real world: files and streams M7 Test

1. What happens if you try to compile and run this program assuming that the fopen() function operation succeeds?

   #include <stdio.h>
   int f(char t[]) {
        return t[0] - t[-1];
   }
   int main(void){
       int i = 2;
       i -= f("ABDGK" + 1);
       printf("%d", i);
       return 0;
   }

   • the program outputs 12A
   • the program outputs 12
   • the program outputs 1
   • the compilation or the execution fails

2. What happens if you try to compile and run this program assuming that the fopen() function operation succeeds?

   #include <stdio.h>
   
   int main(void){
       FILE *f = fopen("file", "w");
       char c;
   
       fputs("12A", f);
       fclose(f);
       f = fopen("file", "r");
       fscanf(f, "%c", &c);
       fclose(f);
   
       printf("%c", c);
       return 0;
   }

   • the program outputs 1
   • the compilation or the execution fails
   • the program outputs 12A
   • the program outputs 12

3. What happens if you try to compile and run this program assuming that the fopen() function operation succeeds?

   #include <stdio.h>
   
   int main(void){
        FILE *f = fopen("file", "w");
        int i;
   
       fputs("12A", f);
       fclose(f);
       f = fopen("file", "r");
       fseek(f);
       i = ftell(f, 0, SEEK_END);
       fclose(f);
   
       printf("%d", i);
       return 0;
   }

   • the program outputs 2
   • the program outputs 3
   • the compilation or the execution fails
   • the program outputs 1

4. What happens if you try to compile and run this program assuming that the fopen() function operation succeeds?

   #include <stdio.h>
   int main(void) {
      FILe *f = fopen("file", "w");
      int i = fputs("Hello!", f);
   
     printf("%d", i != EOF);
     return 0;
   }

   • the program outputs 2
   • the compilation or the execution fails
   • the program outputs 0
   • the program outputs 1

5. What happens if you try to compile and run this program?

   #include <stdio.h>
   
   int main(void) {
       int i;
       i = fprintf(stdin, "HELLO!");
   
       printf("%d", i == EOF);
       return 0;
   }

   • the program outputs 2 
   • the program outputs 1
   • the program outputs 0 
   • the compilation or the execution fails

6. What happens if you try to compile and run this program assuming that the fopen() function operation succeeds?

   #include <stdio.h>
   
   int main(void) {
       FILE *f = fopen("file", "w");
       int i = fputs(f, "HELLO!");
   
      printf("%d", i != EOF);
      fclose(f);
      return 0;
   }

   • the program outputs 2
   • the compilation or the execution fails
   • the program outputs 1
   • the program outputs 0

7. What happens if you try to compile and run this program assuming that the fopen() function operation succeeds?

   #include <stdio.h>
   
   int main(void) {
       FILE *f = fopen("file", "w");
       int i;
   
       fputs("12A", f);
       fclose(f);
   
       f = fopen("file", "r");
       fseek(f, 0, SEEK_END);
       i = ftell(f);
       fclose(f);
   
       printf("%d", i);
       return 0;
   }

   • the program outputs 1
   • the program outputs 2
   • the compilation or the execution fails
   • the program outputs 3

8. The following string:

   D:\USERDIR\jonhdoe.txt

   is a valid file name in:

   • MS Windows systems
   • Unix/Linux systems

9. What happens if you try to compile and run this program assuming that the fopen() function operation succeeds?

   #include <stdio.h>
   
   int main(void) {
       char s[20];
       FILE *f = fopen("file", "w");
       int i = fputs("12A", f);
       fclose(f);
   
         f = fopen("file", "r");
       fgets(s, 2, f);
       puts(s);
       fclose(f);
       return 0;
   }

   • the program outputs 12
   • the compilation or the execution fails
   • the program outputs 1
   • the program outputs 12A

10. What happens if you try to compile and run this program?

    #include <stdio.h>
    
    int i = 0;
    
    int *f(int *i) {
         (*i)++;
         return i;
    }
    
    int main(void)
    {
         int i = 1;
         i = *f(&i);
         
          printf("%d", i);
          return 0;
    }

    • the program outputs 2
    • the program outputs 1
    • the compilation or the execution fails
    • the program outputs 0

11. The following string:

    #HomeDir/HomeFile

    is a valid file name in:

    • MS Windows systems
    • Unix/Linux systems

12. What happens if you try to compile and run this program?

    #include <stdio.h>
    
    int main(void) {
         FILE *f = fopen("file", "w");
         float f;
    
         fputs("12A", f);
         fclose(f);
         f = fopen("file", "r");
         fscanf(f, "%f", &f);
         fscanf(f);
         
          printf("%f", f);
          return 0;
    }

    • the program outputs 0.000000
    • the program outputs 12.000000
    • the program outputs 1.000000
    • the compilation or the execution fails

13. Unix/Linux system treat the following file names:

    JohnDone and Johndone

    as:

    • identical file names
    • different file names

14. What happens if you try to compile and run this program?

    #include <stdio.h>
    int main(void)
    {
          char s[20];
          FILE *f = fopen("file", "w");
          int i = fputs("12A", f);
          fclose(f);
         
          f = fopen("file", "r");
          fgets(s, 20, f);
          puts(s);
          fclose(f);
          return 0;
    }

    • the program outputs 12A
    • the program outputs 12
    • the program outputs 1
    • the compilation or the execution fails

15. What happens if you try to compile and run this program?

    int main(void)
    {
          FILE *f;
     
          f = fopen("file", "wb");
          printf("%d", f != NULL);
          fcolse(f);
              
          
          return 0;
    }

    • the compilation fails
    • the program outputs 0
    • the program outputs 1
    • the execution fails

16. What happens if you try to compile and run this program?

    #include <stdio.h>
    
    int main(void)
    {
         FILE *f;
         f = fopen("file", "wb");
          
          printf(%d, f != NULL);
          fcolse(f);
          return 0;
    }

    • the program outputs 2
    • the compilation fails
    • the program outputs1
    • the program outputs 0

17. The following string:

    JohnDoe

    is a valid file name in:

    • MS Windows system only
    • Unix/Linux and MS Windows system
    • Unix/Linux system only

18. What happens if you try to compile and run this program?

    #include <stdio.h>
    
    int main(void)
    {
          FILE *f;
          int i = fprintf(f, "Hello!");
         
          printf("%d", i == EOF);
          return 0;
    }

    • the program outputs 1
    • the program outputs 2
    • the program outputs 0 
    • the compilation or the execution fails

19. What happens if you try to compile and run this program?

    #include <stdio.h>
    
    int main(void)
    {
         int i;
         i = fprintf(f, "Hello!");
         
          printf("%d", i == EOF);
          return 0;
    }

    • the program outputs 0 to the stdout stream
    • the program outputs 1 to the sttout strezm
    • the compilation or the execution fails
    • the program outputs 2  to the stdout stream

20. What happens if you try to compile and run this program?

    #include <stdio.h>
    
    int main(void)
    {
          FILE f;
          f = fopen("file", "wb");
         
          printf("%d", f != NULL);
          fcolse(f);
          return 0;
    }

    • the compilation  fails
    • the program outputs 1
    • the program outputs 0
    • the execution fails