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Questions and Answers
What is the difference between the prefix and postfix increment operators?
What is the difference between the prefix and postfix increment operators?
- The prefix operator (++val) increments the value by 2, while the postfix operator (val++) increments the value by 1.
- In prefix mode (++val), the operator returns the original value, then increments the variable. In postfix mode (val++), the operator increments the value of the variable first, then returns the incremented value.
- Prefix and postfix operators behave the same way; there is no difference between them.
- In prefix mode (++val), the operator increments the value of the variable first, then returns the incremented value. In postfix mode (val++), the operator returns the original value, then increments the variable. (correct)
Which of the following statements is equivalent to val = val + 1?
Which of the following statements is equivalent to val = val + 1?
- Neither (a) nor (b)
- val++;
- Both (a) and (b) (correct)
- ++val;
In the expression cout << ++val << val++;, what is the output if the initial value of val is 5?
In the expression cout << ++val << val++;, what is the output if the initial value of val is 5?
- 5 5
- 5 6
- 6 5 (correct)
- 6 6
What is the output of the following code snippet?
int x = 10;
cout << x++ << ' ' << ++x;
What is the output of the following code snippet?
int x = 10;
cout << x++ << ' ' << ++x;
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Which operator is used to decrement the value of a variable by 1?
Which operator is used to decrement the value of a variable by 1?
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What is the output of the following code snippet?
int a = 5, b = 10;
a = a++ + ++b;
cout << a << ' ' << b;
What is the output of the following code snippet?
int a = 5, b = 10;
a = a++ + ++b;
cout << a << ' ' << b;
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Study Notes
Increment and Decrement Operators
- The increment operator is
++, which adds one to a variable. val++;is equivalent toval = val + 1;- The increment operator can be used in two ways:
- Prefix:
++val;(increments the variable, then returns the value) - Postfix:
val++;(returns the value of the variable, then increments)
- Prefix:
Decrement Operator
- The decrement operator is
--, which subtracts one from a variable. val--;is equivalent toval = val - 1;- The decrement operator can also be used in two ways:
- Prefix:
--val;(decrements the variable, then returns the value) - Postfix:
val--;(returns the value of the variable, then decrements)
- Prefix:
Using Increment and Decrement Operators in Programs
- Increment and decrement operators can be used in complex statements and expressions.
- It is important to understand the difference between prefix and postfix operators to avoid unexpected results.
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