106. Which of the following is not a valid variable name declaration?

1. 1. #define PI 3.14

   
   
   

   2. int PI = 3.14;

   
   
   

   3. double PI = 3.14;

   
   
   

   4. float PI = 3.14;

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   #define PI 3.14 is a macro preprocessor, it is a textual substitution.

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107. What will be the output of the following C code?
     

     #include <stdio.h>
         int main()
         {
             int p = 200;
             int p = 17;
             printf("Hello Interview Mania! %d\n", p);
             return 0;
         }
     

1. 1. Interview Mania

   
   
   

   2. Hello Interview Mania!

   
   
   

   3. Compilation Error

   
   
   

   4. Runtime Error

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Since p is already defined, redefining it results in an error.

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108. What will be the output of the following C code?
     

     #include <stdio.h>
         int main()
         {
             printf("Hello Interview Mania! %d \n", num);
             return 0;
         }
     

1. 1. Hello Interview Mania! num

   
   
   

   2. Compilation Error

   
   
   

   3. Hello Interview Mania!

   
   
   

   4. Hello Interview Mania! followed by a garbage value

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   It results in an error since num is used without declaring the variable num.

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109. Which is valid C expression?

1. 1. int $new_n = 20;

   
   
   

   2. int new n = 20;

   
   
   

   3. int n = 20;

   
   
   

   4. int new_n = 20;

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   Space, comma and $ cannot be used in a variable name.

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110. Which of the following is true for variable names in C?

1. 1. Variable can be of any length

   
   
   

   2. Variable names cannot start with a digit

   
   
   

   3. It is not an error to declare a variable to be one of the keywords(like goto, static)

   
   
   

   4. They can contain alphanumeric characters as well as special characters

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   According to the syntax for C variable name, it cannot start with a digit.

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