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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'?
What is the result of the expression when the char variable 'a' is added to the integer variable 'b'?
What is the output of the expression 'result = (int) a + 1.5;' where 'a' is a double with a value of 2.5?
What is the output of the expression 'result = (int) a + 1.5;' where 'a' is a double with a value of 2.5?
Which of the following statements about type conversion is false?
Which of the following statements about type conversion is false?
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?
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?
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What is the result of the expression 5 < b < 10 given b is 20?
What is the result of the expression 5 < b < 10 given b is 20?
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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?
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?
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What will be the final value of y after evaluating y using the pre-increment operator with y initialized to 2?
What will be the final value of y after evaluating y using the pre-increment operator with y initialized to 2?
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If the variable d is 100, what will be the output of the expression (a + 10) >= d with a initialized to 1?
If the variable d is 100, what will be the output of the expression (a + 10) >= d with a initialized to 1?
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What output will the expression !(c < d) produce if c is 50 and d is 100?
What output will the expression !(c < d) produce if c is 50 and d is 100?
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In the expression d || b && a, what is the order of operations?
In the expression d || b && a, what is the order of operations?
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Which of the following correctly describes a post-increment operation?
Which of the following correctly describes a post-increment operation?
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In C, what will be the output of the statement result = (a – b) && 1 if a is 1 and b is 20?
In C, what will be the output of the statement result = (a – b) && 1 if a is 1 and b is 20?
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What is the final value of 'y' after executing the code with the statement 'result = y++' where 'y' is initially 2?
What is the final value of 'y' after executing the code with the statement 'result = y++' where 'y' is initially 2?
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In the context of decrement operators, how does 'result = --y' differ from 'result = y--'?
In the context of decrement operators, how does 'result = --y' differ from 'result = y--'?
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What is the precedence of the increment and decrement operators compared to arithmetic operators?
What is the precedence of the increment and decrement operators compared to arithmetic operators?
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What is the purpose of the reference operator '&' in C?
What is the purpose of the reference operator '&' in C?
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What is the final output of 'printf(“Value of y-- is %d
”,result);' if 'result = y--' and 'y' starts at 2?
What is the final output of 'printf(“Value of y-- is %d ”,result);' if 'result = y--' and 'y' starts at 2?
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Which of the following correctly describes the ternary operator?
Which of the following correctly describes the ternary operator?
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If 'x' is assigned the value of '++y', what happens to 'y' if it initially equals 3?
If 'x' is assigned the value of '++y', what happens to 'y' if it initially equals 3?
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Which of the following statements about the sizeOf operator is true?
Which of the following statements about the sizeOf operator is true?
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What will the output be when the pointer ptr is dereferenced to obtain its value after setting the variable a to 20?
What will the output be when the pointer ptr is dereferenced to obtain its value after setting the variable a to 20?
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Which operator has the highest precedence according to the precedence table?
Which operator has the highest precedence according to the precedence table?
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What is the purpose of the sizeof operator?
What is the purpose of the sizeof operator?
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When performing the operation *ptr = 30, what change occurs?
When performing the operation *ptr = 30, what change occurs?
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Which associativity applies to the assignment operators like =, +=, and -=?
Which associativity applies to the assignment operators like =, +=, and -=?
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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?
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?
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What is the correct order of operations from the highest precedence to lower precedence for the operators *, /, and +?
What is the correct order of operations from the highest precedence to lower precedence for the operators *, /, and +?
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What does the dereference operator (*) return when used on a pointer?
What does the dereference operator (*) return when used on a pointer?
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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?
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?
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If x is initially 10 and is modified by the operation 'x -= 2;', what is the new value of x?
If x is initially 10 and is modified by the operation 'x -= 2;', what is the new value of x?
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Which of the following represents a valid use of relational operators in C?
Which of the following represents a valid use of relational operators in C?
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In the context of assignment operators, what does the statement 'x *= 2;' do?
In the context of assignment operators, what does the statement 'x *= 2;' do?
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What is the result of the comparison '5 != 5' in C?
What is the result of the comparison '5 != 5' in C?
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Which operator has higher precedence in C: '*' or '='?
Which operator has higher precedence in C: '*' or '='?
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What will be the output of 'printf("The value of a is %d\n", a);' if a was set to 10?
What will be the output of 'printf("The value of a is %d\n", a);' if a was set to 10?
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In the context of logical operations, how is true represented in C?
In the context of logical operations, how is true represented in C?
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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 doublea
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 be1.5
, as the integera
(3) is implicitly converted to a double before division by the doubleb
(2).
Logical Operators and Operators Precedence
- The expression
5 < b < 10
withb
as 20 would evaluate to false. The operators are evaluated from left to right in this scenario. First,5 < 20
evaluates totrue
which is equal to 1. Then1 < 10
evaluates totrue
, resulting in the final output oftrue
. - The logical AND (
&&
) operator would result intrue
because both expressions(a < b)
and(b < c)
aretrue
given the provided values ofa
,b
, andc
. - 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 totrue
because the(a + 10)
is 11, which is indeed greater than or equal tod
, which is 100. So, the output will betrue
. - The expression
!(c < d)
will producefalse
. The innerc < d
istrue
as50
is less than100
but the logical negation operator!
negates this result resulting infalse
. - 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 asd || (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
becomes0 && 1
which evaluates to 0. - The final value of
y
afterresult = y++
will be 3. The post-increment operator increments the value ofy
after it has been used in the expression'result = y++'
. Therefore, the value ofy
will be 3, andresult
will contain 2, the original value ofy
. - The
--x
(pre-decrement) operator decrements the value ofx
before it is used in the expression, whilex--
(post-decrement) operator decrements the value ofx
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 ofy
after it is used in the expressionresult = y--
. Therefore, the value ofy
will be 1 after the expression is executed, but the value ofresult
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 ofy
before assigning it tox
. - 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. Sinceptr
is pointing toa
(20),*ptr
will give the value ofa
, which is20
. - 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 pointerptr
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 becauseptr
is pointing to memory location ofa
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
orx <= y
, which compares the values of variablesx
andy
using the relational operators>
(greater than) and<=
(less than or equal to). - The statement
x *= 2
multiplies the value ofx
by 2 and assigns the result back tox
. - The result of the comparison
5 != 5
will befalse
. 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", asa
has been set to 10. - In C,
1
(or any non-zero value) representstrue
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.