C++ Break
In this article, we will discuss the C++ Break statement with its syntax, algorithm, pseudocode, and examples.
The C++ break statement also terminates the currently active loop or switch statement immediately. It causes the program to leave the current loop or switch block and resume at the statement immediately following the loop or switch.
Syntax:
It has the following syntax:
Break;
Break statement in C++
- Loops (for, while, and do-while): These loops are used to break out of the loop early when a specific condition is satisfied.
- Switch Statements: This statement is used to stop case labels from falling through.
The break statement where it is used mostly:
- Exiting loops: When a specific condition is satisfied inside the loop, the break function can be used to terminate the loop and prevent further iterations.
- Breaking out of a switch Statement: Break makes sure that the software doesn’t carry out future cases after a case is ended.
Algorithm for Break statement in a loop:
- Start the program.
- Initialize a loop (e.g., for, while, or do-while).
- Inside the loop, check a condition to determine if break should be executed.
- If the condition is met, execute break to exit the loop.
- Continue execution of the program after the loop.
- End the program.
Pseudo code for Break statement in a loop:
Begin
For i = 1 to 10 do
Print i
If i == 5 then
Print "Breaking the loop at i = 5"
Break // Exit the loop
Endif
Endfor
End
Key Aspects:
- It is utilized for stopping iterations within while, do-while, and for loops.
- It is used in switch statements to prevent fall-through.
- Wherever it is placed, it only exits the innermost switch or loop.
- It exclusively sets a stop to execution at a certain point; conditional statements remain intact.
Usage of break statement in Loops:
A loop is terminated immediately when a break statement is used in the loop. Control goes to the statement immediately following the loop.
Example 1:
Let us take an example to illustrate the break statement in C++.
#include <iostream>
using namespace std;
int main() {
for (int i = 1; i <= 5; i++) {
if (i == 3) {
break; // Exits the loop when i is 3
}
cout << "Iteration: " << i << endl;
}
cout << "Loop exited!" << endl;
return 0;
}
Output:
Iteration: 1 Iteration: 2 Loop exited!
Example 2:
Let us take another example to illustrate the break statement in C++.
#include <iostream>
using namespace std;
int main() {
for (int i = 1; i <= 10; i++) {
if (i == 5) { // Condition to exit the loop
cout << "Breaking the loop at i = " << i << endl;
break; // Exits the loop when i equals 5
}
cout << i << " ";
}
cout << "
Loop exited successfully." << endl;
return 0;
}
Output:
1 2 3 4 Breaking the loop at i = 5 Loop exited successfully.
Algorithm for Break statement in Switch case:
- Start the program.
- Accept an input choice.
- Use a switch statement to check the value of the input.
- If a case matches the input value:
- Execute the corresponding block of statements.
- Use break to prevent execution of the next case.
- If no cases match, execute the default case.
- End the program.
Pseudo code for Break statement in Switch case:
Begin
Read choice
Switch (choice) DO
CASE 1:
Print "Choice is 1"
Break
CASE 2:
Print "Choice is 2"
Break
CASE 3:
Print "Choice is 3"
Break
Default:
Print "Invalid choice"
End Switch
End
Example 1: Usage of break statement in the switch case
Let us take an example to illustrate the break statement using switch case in C++.
#include <iostream>
using namespace std;
int main() {
int choice = 2;
switch (choice) {
case 1:
cout << "Choice is 1
";
break;
case 2:
cout << "Choice is 2
";
break;
case 3:
cout << "Choice is 3
";
break;
default:
cout << "Invalid choice
";
}
return 0;
}
Output:
Choice is 2
Example 2:
Let us take another example to illustrate the break statement using switch case in C++.
#include <iostream>
using namespace std;
int main() {
int choice;
cout << "Enter a number (1-3): ";
cin >> choice;
switch (choice) {
case 1:
cout << "You selected option 1." << endl;
break;
case 2:
cout << "You selected option 2." << endl;
break;
case 3:
cout << "You selected option 3." << endl;
break;
default:
cout << "Invalid choice!" << endl;
}
cout << "Switch statement completed." << endl;
return 0;
}
Output:
Enter a number (1-3): 2 You selected option 2. Switch statement completed.
If there were no break, execution would go on to the following case, resulting in different manner.
Conclusion:
In conclusion, the break statement in C++ is a very strong control flow tool that allows programmers to terminate their loops and switch statements very quickly, hence avoiding unnecessary iterations and ensuring proper logical execution. The use of break in switch statements is essentially meant to control the flow of the program because it ensures that only the matched case gets executed while guarding against unintended fall-through to subsequent cases. It also prevents the iteration of loops when a certain condition is satisfied. Breaks are required in structured programming, but not too much in order to keep clarity in codes and an avoidance of immediate exits.