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how break works in a for loop?

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Anonymous

12y ago
Updated: 8/20/2019

break in most of programming languages are interpreted or compiled as goto instructions, with the label to go to is compiler generated. A break statmenet within a for-loop, provides that there is no nested loops (while, do-while, repeat, etc) is to instruct the program execution to unconditionally goto (skip the condition check) to the next statement outside of the for-loop.

Conceptually or in abstraction, break should be considered as goto as well. Academically, there are conflicts: goto statements are bad but break-statement is acceptable. (they are the identical in certain context, should not be any discrimination or bias)

The following 3 segments will be compiled into similar instructions, and the same runtime efficiency and effectness:

Segment 1: normal construct

for (int i = 0; i < 2; i++) {//do something}

Segment 2: explicitly condition check with break-statement

for (int i = 0; ; i++) {

if (i >=2) break;

//do something

}

Segment 3: the equivalent of segment 2 with a gotostatement

for (int i = 0; ; i++) {

if (i >=2) goto OutOfLoop;

//do something

}

OutOfLoop:

Personal coding advise: choose break and gotostatements wisely. However, I have no need to use either statement in my professional coding career yet (switch or case statements may apply break-statements as well, yet, I could avoid switch statement, too)

A feature (break or goto) is provided by the language, does not mean that you have to use that feature in your code

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Wiki User

12y ago

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