break statement

 

C++

Language

Standard library headers

Concepts

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

 

C++ language

 

Statements

Labels

label : statement

Expression statements

expression ;

Compound statements

{ statement... }

Selection statements

if

switch

Iteration statements

while

do-while

for

range for(C++11)

Jump statements

break

continue

return

goto

Declaration statements

declaration ;

Try blocks

try compound-statement handler-sequence

 

Causes the enclosing for, range-for, while or do-while loop or switch statement to terminate.

Used when it is otherwise awkward to terminate the loop using the condition expression and conditional statements.

Syntax

attr(optional) break ;

Explanation

After this statement the control is transferred to the statement immediately following the enclosing loop. All automatic storage objects declared in enclosing loop are destroyed before the execution of the first line following the enclosing loop.

Keywords

break

Example

Run this code

#include <iostream>
 
int main()
{
    int i = 2;
    switch (i) {
        case 1: std::cout << "1";
        case 2: std::cout << "2";   //execution starts at this case label
        case 3: std::cout << "3";
        case 4:
        case 5: std::cout << "45";
                break;              //execution of subsequent statements is terminated
        case 6: std::cout << "6";
    }
 
    std::cout << '\n';
 
    for (int j = 0; j < 2; j++) {
        for (int k = 0; k < 5; k++) {         //only this loop is affected by break
            if (k == 2) break;
            std::cout << j << k << " ";
        }
    }
}

Output:

2345
00 01 10 11