Key Concepts

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if statement in C++

if (a == 10) { // code goes here }

In C++, an if statement is used to test an expression for truth. If the expression evaluates to true then the code within the if statement block is executed.

if statement in C++ programming.

if (a == 10) { // code goes here }

In C++, an if statement is used to evaluate an expression. The code block belonging to if is executed if the expression evaluates to true.

C++ relational operators

if (a == 10) { // code goes here }

In C++, relational operators are used to compare two values. The values are known as operands. The relational operators in C++ are as follows:

  • == equal to

  • != not equal to

  • > greater than

  • < less than

  • >= greater than or equal to

  • <= less than or equal to

Relational operators in C++.

if (a == 10) { // code goes here }

In C++, we use relational operators to compare two values. The result of a comparison is either true or false.

The relational operators in C++ are as follows.

  • == - equal to
  • != - not equal to
    • greater than
  • < - less than
  • = - greater than or equal to

  • <= - less than or equal to

C++ else clause.

if (a == 10) { // code goes here }

In C++, we can add an else clause to an if statement. If the condition evaluates to true, code pertaining to if statement is executed. If the condition evaluates to false, code pertaining to else part is executed.

else if statement in C++.

if (a == 10) { // code goes here }

In C++, to check for multiple conditions, we can have else if statement(s) in between if and else.

switch statement in C++.

if (a == 10) { // code goes here }

In C++ programming, a switch statement can be used in place of if, else if, else.

It is used in conjunction with case, and the case which matches is executed. default is executed when no case matches.

Logical operators in C++.

if (a == 10) { // code goes here }

In C++, we use logical operators to combine two different conditions. Each condition is evaluated independently and the final result is decided by logical operators.

Following are the logical operators:

  • && Logical and operator
  • || Logical or operator
  • ! Logical not opertor

&& logical operator requires both conditions to be true. || logical operator requires either of the condition to be true. ! Logical operator negates the result.

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Conditionals & Logic
Lesson 1 of 2
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  1. 1
    Every program we’ve seen so far has only had one possible path of execution — they all execute line by line, from top to bottom. And every time you run one of those programs, it gives you the same …
  2. 2
    Before we dive deep into the syntax of the if statement, let’s do a demo! Here, we have coinflip.cpp program that simulates a coin toss: - 50% of the time, it’s Heads. - 50% of the time, i…
  3. 3
    An if statement is used to test an expression for truth and execute some code based on it. Here’s a simple form of the if statement: if\ (condition)\ {statements} If the condition is true, t…
  4. 4
    When writing conditional statements, sometimes we need to use different types of operators to compare values. These operators are called relational operators. To have a condition, we need relati…
  5. 5
    We can also add an else clause to an if statement to provide code that will only be executed if the condition is false. Here’s a form of an if statement that includes an else clause: if\ (conditio…
  6. 6
    So what happens if you want more than two possible outcomes? This is where else if comes in! if\ (condition)\ {statement1} else\ if\ (condition)\ {statement2} else\ {statement3} The els…
  7. 7
    Now that we know how if, else if, else work, we can write programs that have multiple outcomes. Programs with multiple outcomes are so common that C++ provides a special statement for it… the swi…
  8. 8
    Congratulations!  Here are some of the major concepts: - An if statement checks a condition and will execute a task if that condition evaluates to true. - if / else statements make binary decisi…
  1. 1
    Often, when we are trying to create a control flow for our program, we’ll encounter situations where the logic cannot be satisfied with a single condition. Logical operators are used to combine …
  2. 2
    The and logical operator is denoted by &&. It returns true if the condition on the left and the condition on the right are both true. Otherwise, it returns false. Here’s the truth table: | a | …
  3. 3
    The or logical operator || returns true when the condition on the left is true or the condition on the right is true. Only one of them needs to be true. Here’s the truth table: | a | b | a \|\|…
  4. 4
    The not logical operator ! reverses the bool outcome of the expression that immediately follows. Here’s the truth table: | a | !a | | — | — | | false | true | | true | false | For instanc…
  5. 5
    Awesome! In this mini-lesson, we’ve added more operators to our toolbox: - &&: the and logical operator - ||: the or logical operator - !: the not logical operator

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