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Home C Programming Input / Output See What Others Are Saying!
  • Question
  • What will be the output of the program?
    #include<stdio.h>
    
    int main()
    {
        FILE *ptr;
        char i;
        ptr = fopen("myfile.c", "r");
        while((i=fgetc(ptr))!=NULL)
            printf("%c", i);
        return 0;
    }
    


  • Options
  • A. Print the contents of file "myfile.c"
  • B. Print the contents of file "myfile.c" upto NULL character
  • C. Infinite loop
  • D. Error in program

  • Correct Answer
  • Infinite loop 

    Explanation
    The program will generate infinite loop. When an EOF is encountered fgetc() returns EOF. Instead of checking the condition for EOF we have checked it for NULL. so the program will generate infinite loop.

  • More questions

    • 1. Is it necessary that in a function which accepts variable argument list there should be at least be one fixed argument?

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 2. Bitwise can be used to generate a random number.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 3. A function that receives variable number of arguments should use va_arg() to extract the last argument from the variable argument list.

    • Options
    • A. True
    • B. False
    • Discuss
    • 4. Bitwise & can be used to check if more than one bit in a number is on.

    • Options
    • A. True
    • B. False
    • Discuss
    • 5. The preprocessor can trap simple errors like missing declarations, nested comments or mismatch of braces.

    • Options
    • A. True
    • B. False
    • Discuss
    • 6. It is necessary that a header files should have a .h extension?

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 7. Bitwise | can be used to set multiple bits in number.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 8. Bitwise & can be used to check if a bit in number is set or not.

    • Options
    • A. True
    • B. False
    • Discuss
    • 9. A pointer union CANNOT be created

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 10. What will be the output of the program?
      #include<stdio.h>
      #include<stdlib.h>
      
      int main()
      {
          union test
          {
              int i;
              float f;
              char c;
          };
          union test *t;
          t = (union test *)malloc(sizeof(union test));
          t->f = 10.10f;
          printf("%f", t->f);
          return 0;
      }
      

    • Options
    • A. 10
    • B. Garbage value
    • C. 10.100000
    • D. Error
    • Discuss


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