C Programming: Operators and Precedence

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Questions and Answers

Given the expression `x = a++ + b`, where `a` is 5 and `b` is 10 initially, what is the value of `x` and `a` after execution?

x = 16, a = 5
x = 16, a = 6
x = 15, a = 5
x = 15, a = 6 (correct)

What is the output of the following code snippet?

int fun(int x) {
  return x++;
}

int main() {
  int y = 5;
  int z = fun(y);
  printf("%d %d", y, z);
  return 0;
}

6 6
6 5
5 5 (correct)
5 6

What does the `sizeof` operator return in C?

The address of a variable.
The value stored in a variable.
The data type of a variable.
The size, in bytes, of a variable or data type. (correct)

What is the purpose of a left shift operator (`<<`)?

To multiply by a power of 2. (A) Signup and view all the answers

In C, what is the difference between declaring and initializing a variable?

Declaration allocates memory, initialization assigns a value. (C) Signup and view all the answers

Which of the following is NOT a valid keyword in C?

integer (A) Signup and view all the answers

What is the scope of a global variable in C?

Available throughout the entire program. (A) Signup and view all the answers

Given the code `#define SIZE 10`, what is `SIZE`?

A constant. (B) Signup and view all the answers

What is the main difference between `const` and `#define` when defining constants in C?

<code>const</code> performs type checking, while <code>#define</code> does not. (C) Signup and view all the answers

What is the output of the following code snippet?

#include <stdio.h>
int main() {
  int x = 0x1A; // Hexadecimal representation
  printf("%d", x);
  return 0;
}

26 (A) Signup and view all the answers

In C, what happens if you try to assign a value larger than the maximum range of a data type (e.g., assigning a large number to a short int)?

Overflow occurs, leading to undefined behavior. (A) Signup and view all the answers

What is a static variable in C?

A variable that retains its value between function calls. (B) Signup and view all the answers

What is the difference between local and global variables in C?

Global variables are accessible everywhere in the program, while local variables are only accessible within the function they are defined in. (A) Signup and view all the answers

Which of the following describes the correct order of evaluation for the expression `a + b * c` in C, assuming standard operator precedence?

Multiplication is performed before addition. (D) Signup and view all the answers

Given a 32-bit system, what is the typical size (in bytes) of an `int` data type?

4 (C) Signup and view all the answers

What is the significance of the ASCII encoding in C programming?

It is used to represent characters as numerical values. (B) Signup and view all the answers

What is the likely output of the following code snippet?

int a = 5;
int b = (a > 3) ? 10 : 20;
printf("%d", b);

10 (A) Signup and view all the answers

Which header file is typically required to use the `printf` function in a C program?

<stdio.h> (B) Signup and view all the answers

Given `int x = 5;`, what is the difference between `x++` and `++x`?

<code>++x</code> increments <code>x</code> before using its value in an expression, <code>x++</code> increments <code>x</code> after using its value. (D) Signup and view all the answers

What will be the output of the following C code?

#include <stdio.h>
int main() {
    int x = 5;
    printf("%d ", x << 2);
    return 0;
}

20 (C) Signup and view all the answers

Flashcards

C Programming Language

A programming language used to instruct a computer to perform tasks.

Operator Precedence

Rules that dictate the order in which operators are evaluated in an expression.

Associativity Rules

Rules that determine the order of evaluation when operators of the same precedence appear in an expression.