61. Array sizes are optional during array declaration by using ______ keyword.

1. 1. register

   
   
   

   2. extern

   
   
   

   3. static

   
   
   

   4. auto

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   extern

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62. What will be the sequence of allocation and deletion of variables in the following C code?
    

    #include <stdio.h>
        int main()
        {
            int num;
            {
                int var;
            }
        }
    

1. 1. var->num, num->var

   
   
   

   2. var->num, var->num

   
   
   

   3. num->var, var->num

   
   
   

   4. num->var, num->var

   
   
   

   5. None of these
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   num->var, var->num

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63. Comment on the following 2 C Example programs.
    

    #include <stdio.h> //Example 1
        int main()
        {
            int p;
            int q;
            int r;
        }
     
        #include <stdio.h> //Example 2
        int main()
        {
            int p;
            {
                int q;
            }
            {
                int r;
            }
        }
    

1. 1. Scope of r is till the end of the main function in Example 2

   
   
   

   2. In Example 1, variables p, q and r can be used anywhere in main function whereas in Example 2, variables q and r can be used only inside their respective blocks.

   
   
   

   3. Both are same

   
   
   

   4. Scope of p, q and r is till the end of the main function in Example 2.

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   None of these

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64. Which variable has the longest scope in the following C code?
    

    #include <stdio.h>
        int p;
        int main()
        {
            int q;
            return 0;
        }
        int r;
    

1. 1. p

   
   
   

   2. q

   
   
   

   3. r

   
   
   

   4. both p and r

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   p

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65. Comment on the output of the following C code.
    

    #include <stdio.h>
        int main()
        {
            int k;
            for (k = 0; k < 10; k++)
            int m = k;
            printf("%d", m);
        }
    

1. 1. Redeclaration of m in same scope throws error

   
   
   

   2. Syntax error in declaration of m

   
   
   

   3. m is out of scope when printf is called

   
   
   

   4. No errors, program will show the output 15

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   Syntax error in declaration of m

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