Connecting to the real world: files and streams M7 Test

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