Control Flow - Conditional Statements
Prateek Narang
Topics
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Conditional Statements
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if
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if-else
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else if
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Ternary operator
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Switch case
Conditional Statements
if statement
Use the if statement to specify a block of C++ code to be executed if a condition is true.
if(condition){
// block gets executed if the condition is true
// some logic here
}
else statement
The else statement is used along with the if block.
Use the else statement to specify a block of code to be executed if the condition is false.
if(condition){
// block gets executed if the condition is true
// some code here
}
else{
// some code, execute when the condition is false
}
else if
if (condition1) {
// block of code to be executed if condition1 is true
}
else if (condition2) {
// block of code to be executed if the condition1 is false and condition2 is true
}
else {
// block of code to be executed if the condition1 is false and condition2 is false
}Use the else if statement to specify a new condition if the previous blocks condition is false.
Ternary Operator [ ? : ]
It consists of three operands, hence the name ternary operator.
It is often used to replace simple if else statements:
// Syntax
variable = (condition) ? expressionTrue : expressionFalse;
Use the switch statement to select one of many code blocks to be executed.
Switch Case
switch(expression) {
case x:
// code block
break;
case y:
// code block
break;
default:
// code block
}- The switch expression is evaluated once
- The value of the expression is compared with the values of each case
- If there is a match, the associated block of code is executed
Switch Case
switch(expression) {
case x:
// code block
break;
case y:
// code block
break;
default:
// code block
}Examples
[Topics 07] Conditional Statements
By Prateek Narang
