Which of the following is not a valid variable name declaration?
A. int _a3;
B. int a_3;
C. int 3_a;
D. int _3a
Answer: Option C
A. int _a3;
B. int a_3;
C. int 3_a;
D. int _3a
Answer: Option C
What is the primary purpose of a function prototype in C?
A. Declare a variable
B. Declare a function
C. Define a function
D. Assign a value
What is the correct syntax for declaring a variable in C?
A. int variable_name;
B. variable_name = 5;
C. variable_name int;
D. int = variable_name;
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