C Programming Basics: Operators

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Questions and Answers

What is the result of the expression when the char variable 'a' is added to the integer variable 'b'?

67 (correct)

What is the output of the expression 'result = (int) a + 1.5;' where 'a' is a double with a value of 2.5?

3 (correct)

Which of the following statements about type conversion is false?

Implicit conversion always leads to data loss. (correct)

Character values are converted to their ASCII representation.

Type casting can be done explicitly.

Type conversion upgrades to the largest datatype.

In the expression 'result = a / b;' where 'a' is an int with a value of 3 and 'b' is a double with a value of 2, what is the output?

1.5 Signup and view all the answers

What is the result of the expression 5 < b < 10 given b is 20?

1 Signup and view all the answers

Which logical operator would yield a true result for the expression (a < b) && (b < c) if a is 1, b is 20, and c is 30?

&& Signup and view all the answers

What will be the final value of y after evaluating y using the pre-increment operator with y initialized to 2?

3 Signup and view all the answers

If the variable d is 100, what will be the output of the expression (a + 10) >= d with a initialized to 1?

0 Signup and view all the answers

What output will the expression !(c < d) produce if c is 50 and d is 100?

1 Signup and view all the answers

In the expression d || b && a, what is the order of operations?

Evaluate b && a first, then d Signup and view all the answers

Which of the following correctly describes a post-increment operation?

Value is incremented after being used Signup and view all the answers

In C, what will be the output of the statement result = (a – b) && 1 if a is 1 and b is 20?

0 Signup and view all the answers

What is the final value of 'y' after executing the code with the statement 'result = y++' where 'y' is initially 2?

3 Signup and view all the answers

In the context of decrement operators, how does 'result = --y' differ from 'result = y--'?

Pre-decrement decreases 'y' first and assigns the new value to 'result' Signup and view all the answers

What is the precedence of the increment and decrement operators compared to arithmetic operators?

Higher than arithmetic operators Signup and view all the answers

What is the purpose of the reference operator '&' in C?

To return the address of a variable Signup and view all the answers

What is the final output of 'printf(“Value of y-- is %d ”,result);' if 'result = y--' and 'y' starts at 2?

2 Signup and view all the answers

Which of the following correctly describes the ternary operator?

An operator that returns true or false based on a condition Signup and view all the answers

If 'x' is assigned the value of '++y', what happens to 'y' if it initially equals 3?

y becomes 4 Signup and view all the answers

Which of the following statements about the sizeOf operator is true?

It returns the size of a variable in bytes Signup and view all the answers

What will the output be when the pointer ptr is dereferenced to obtain its value after setting the variable a to 20?

20 Signup and view all the answers

Which operator has the highest precedence according to the precedence table?

() Signup and view all the answers

What is the purpose of the sizeof operator?

To determine the memory size of a variable in bytes Signup and view all the answers

When performing the operation *ptr = 30, what change occurs?

The variable a is updated to 30. Signup and view all the answers

Which associativity applies to the assignment operators like =, +=, and -=?

Right-to-Left Signup and view all the answers

If a variable a is assigned the value 4 and a pointer ptr points to it, what does printf("Value pointed by pointer ptr is %d\n",*ptr); show before any changes to a?

4 Signup and view all the answers

What is the correct order of operations from the highest precedence to lower precedence for the operators *, /, and +?

<ul> <li> <blockquote> / > + </blockquote> </li> </ul> Signup and view all the answers

What does the dereference operator (*) return when used on a pointer?

The value of the variable pointed to Signup and view all the answers

What will be the output of the statement 'printf("The value of x is %d\n", x);' after executing the code if x was initially set to 10 and incremented by 5?

15 Signup and view all the answers

If x is initially 10 and is modified by the operation 'x -= 2;', what is the new value of x?

8 Signup and view all the answers

Which of the following represents a valid use of relational operators in C?

if (a == b) Signup and view all the answers

In the context of assignment operators, what does the statement 'x *= 2;' do?

Multiplies x by 2 Signup and view all the answers

What is the result of the comparison '5 != 5' in C?

0 (false) Signup and view all the answers

Which operator has higher precedence in C: '*' or '='?

'*' Signup and view all the answers

What will be the output of 'printf("The value of a is %d\n", a);' if a was set to 10?

10 Signup and view all the answers

In the context of logical operations, how is true represented in C?

Both A and C Signup and view all the answers

Study Notes

Type Conversion and Data Types

When a char variable is added to an integer variable, the char is first converted to its corresponding integer value before the addition takes place.
The output will be 3.5. The (int) a cast converts the double a to an integer (2) before adding 1.5
A false statement regarding type conversion is that type conversion always happens implicitly, which is incorrect, as explicit type conversion is also possible using casting.
The result of dividing an integer by a double will be a double.
The result will be 1.5, as the integer a (3) is implicitly converted to a double before division by the double b (2).

Logical Operators and Operators Precedence

The expression 5 < b < 10 with b as 20 would evaluate to false. The operators are evaluated from left to right in this scenario. First, 5 < 20 evaluates to true which is equal to 1. Then 1 < 10 evaluates to true, resulting in the final output of true.
The logical AND (&&) operator would result in true because both expressions (a < b) and (b < c) are true given the provided values of a, b, and c.
The pre-increment operator increments the variable before its value is used in the expression. The final value of y will be 3.
The >= operator (greater than or equal to) will evaluate to true because the (a + 10) is 11, which is indeed greater than or equal to d, which is 100. So, the output will be true.
The expression !(c < d) will produce false. The inner c < d is true as 50 is less than 100 but the logical negation operator ! negates this result resulting in false.
In the expression d || b && a, the operator precedence is as follows: && (logical AND) has higher precedence than || (logical OR). So, the expression will be evaluated as d || (b && a).
A post-increment operation increments the variable after its value is used in the expression. So, the original value is used in the expression.
The output of result = (a – b) && 1 in C will be 0 (which is considered false). The (a – b) evaluates to -19, which is false because it's a non-zero negative number. Therefore, the expression (a-b) && 1 becomes 0 && 1 which evaluates to 0.
The final value of y after result = y++ will be 3. The post-increment operator increments the value of y after it has been used in the expression 'result = y++'. Therefore, the value of y will be 3, and result will contain 2, the original value of y.
The --x (pre-decrement) operator decrements the value of x before it is used in the expression, while x-- (post-decrement) operator decrements the value of x after it has been used in the expression.
The increment and decrement operators have higher precedence than arithmetic operators. They are usually evaluated before arithmetic operations.
The & (reference operator) is used to obtain the memory address of a variable. It returns the memory address of the variable.

Understanding Pointers, Operators, and Expressions

The final output of printf(“Value of y-- is %d ”,result); will be "Value of y-- is 2". This is because the postfix -- decrement operator decrements the value of y after it is used in the expression result = y--. Therefore, the value of y will be 1 after the expression is executed, but the value of result will be 2, which is printed.
The ternary operator is a shorthand way to write an if-else statement in C. It takes three operands and returns one of two values depending on the result of the first operand.
y will be incremented to 4. Since ++ is a pre-increment operator, it increments the value of y before assigning it to x.
The sizeof operator returns the number of bytes occupied by a data type or a variable.
The output will be 20. Dereferencing a pointer (*ptr) accesses the value stored at the memory location pointed to by the pointer. Since ptr is pointing to a (20), *ptr will give the value of a, which is 20.
The unary negation operator (!) has the highest precedence in C.
The sizeof operator is used to calculate the size in bytes of a data type or a variable.
When the operation *ptr = 30 is performed, the value at the memory location pointed to by the pointer ptr is changed to 30.
Assignment operators like =, +=, and -= in C have right-to-left associativity.
The output will be Value pointed by pointer ptr is 4\n. This is because ptr is pointing to memory location of a which has value 4.
The order of operations for *, /, and + is: * and / have the same priority and are evaluated from left to right. + has lower priority than * and /.
The dereference operator (*) returns the value that is stored at the memory location pointed to by the pointer.
The output will be "The value of x is 15\n". The instruction x = x + 5 increases the value of x by 5.
The new value of x will be 8. The -= operator subtracts the right operand from the left operand and assigns the result to the left operand.
A valid use of relational operators in C would be x > y or x <= y, which compares the values of variables x and y using the relational operators > (greater than) and <= (less than or equal to).
The statement x *= 2 multiplies the value of x by 2 and assigns the result back to x.
The result of the comparison 5 != 5 will be false. The != operator checks if the two operands are not equal.
In C, the operator * (multiplication) has higher precedence than the assignment operator =.
The output of printf("The value of a is %d\n", a); will be "The value of a is 10\n", as a has been set to 10.
In C, 1 (or any non-zero value) represents true in logical operations.

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Description

This quiz covers essential operators in C programming, focusing on assignment, relational, and logical operators. Test your understanding of how these symbols function in various operations and comparisons. Ideal for beginners who want to solidify their grasp of C language fundamentals.