46. Which keyword is used to prevent any changes in the variable within a C program?

1. 1. volatile

   
   
   

   2. const

   
   
   

   3. mutable

   
   
   

   4. immutable

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   const is a keyword constant in C program.

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47. Which of the following declaration is not supported by C?

1. 1. String str;

   
   
   

   2. float str = 4e3;

   
   
   

   3. Both String str; & float str = 4e3;

   
   
   

   4. char *str;

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   It is legal in Java, but not in C.

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48. Which of the following format identifier can never be used for the variable var?
    

    #include <stdio.h>
        int main()
        {
            char *variable = "Advanced Training in C by interviewmania.com";
        }
    

1. 1. %s

   
   
   

   2. %c

   
   
   

   3. %d

   
   
   

   4. %f

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   %c can be used to print the indexed position.
   %d can still be used to display its ASCII value.
   %s is recommended.
   %f cannot be used for the variable var.

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49. Which of the following declaration is illegal?

1. 1. char[] s = “Best C programming classes by Interview Mania”;

   
   
   

   2. char s[10] = “Best C programming classes by Interview Mania”;

   
   
   

   3. char s[] = “Best C programming classes by Interview Mania”;

   
   
   

   4. char *s = “Best C programming classes by Interview Mania”;

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   char[] s is a declaration in Java, but not in C.

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50. Will the following C code compile without any error?
    

    #include <stdio.h>
        int main()
        {
            int n;
            {
                int n;
                for (n = 0; n < 12; n++);
            }
        }
    

1. 1. No

   
   
   

   2. Yes

   
   
   

   3. Depends on the C standard implemented by compilers

   
   
   

   4. All of above

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   There can be blocks inside the block. But within a block, variables have only block scope.

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