C Programming - MCQ Practice Questions

In C, which storage class has the longest scope and lifetime?

What is the size of the double data type in most 64-bit systems?

Which of the following variable names is INVALID in C?

What will be the result of sizeof(int) on a typical 32-bit system?

Which storage class variable is automatically initialized to 0 if not explicitly initialized?

Consider: long long int x; What is the minimum guaranteed size of x according to C standard?

Which of the following demonstrates proper type casting in C?

What is the difference between 'signed' and 'unsigned' char in terms of range?

Which keyword prevents a local variable from being optimized by compiler into a register?

In the declaration 'int *p, q;', what are the data types of p and q?

What happens when you attempt to store a double value in an int variable without explicit casting?

Which of the following is a correct way to declare a constant variable in modern C?

What is the output of: printf("%d", sizeof(char) + sizeof(int) + sizeof(float)); on a typical 32-bit system?

A variable declared with 'register' storage class suggests to the compiler to store it in:

What is true about the variable declared as 'extern int count;' inside a function?

Consider a structure with int (4 bytes), char (1 byte), and double (8 bytes). What is the minimum size due to alignment requirements?

Which of the following statements about type qualifiers is INCORRECT?

What is the default data type of a floating-point constant in C?

What is the size of int data type on a 32-bit system according to C standard?

In the declaration 'int arr[10], *ptr;', which statement is correct?