I have a structure like this
for(..;..;..)
{
if(true)
{
}
//statements
}
I want to write a statement inside if except goto that will send the control only outside if and execute statements that I have marked.
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You have to explain a little more. Do you need it to go only for that iteration, for the nest iteration, or for all the subsequent ones.Haris– Haris2015-11-20 05:14:27 +00:00Commented Nov 20, 2015 at 5:14
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No not break because break in case of break the control will go outside the for loop altogetherAvinash Sharma– Avinash Sharma2015-11-20 05:18:32 +00:00Commented Nov 20, 2015 at 5:18
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Give a more detailed example..Haris– Haris2015-11-20 05:19:28 +00:00Commented Nov 20, 2015 at 5:19
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What I mean is that i just want to come out of that if block and execute statements written at the place where I have mentioned //statements in my codeAvinash Sharma– Avinash Sharma2015-11-20 05:19:53 +00:00Commented Nov 20, 2015 at 5:19
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May be put the if inside a do while and use break. Though i cant say for sure if this is what you want. Explain more.tapananand– tapananand2015-11-20 05:20:25 +00:00Commented Nov 20, 2015 at 5:20
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4 Answers
A common way to handle this situation is to put the body of the if statement into a separate function, and then return from the middle of the function if, for some reason, the function is unable to finish. After the function returns, the remainder of the statements in the for loop will run.
void foo(void)
{
//statements
//statements
if ( something_bad_happened )
return;
//statements
//statements
if ( some_other_bad_thing_happened )
return;
//statements
//statements
}
void bar(void)
{
for(..;..;..)
{
if ( some_foo_is_needed )
foo();
//statements
//statements
}
}
Comments
You can put your if inside a dummy do..while loop like this:
for(..;..;..)
{
do
{
if ()
{
//use break somewhere here according to your logic
}
}while(false);
//statements
}
This will cause the break to only skip the inner do..while loop.
The condition is false in do..while so that the loop runs only once as is expected in case of a normal if. The loop is there just to allow a break in the middle.
Comments
Instead of an if, use a switch statement. You can break out of a switch at any point. This isn't a very practical solution... but it works.
for(..;..;..)
{
switch(boolean_expression) { //break just leaves this switch statement
case 0: //false is 0
break;
default: //true is not zero
//statements
if(something)
break;
//statements you want to skip
break;
}
//statements
}
Comments
If I understand your question, that you want to write a statement inside if and goto your marked statements only if that condition is true, then a goto statement can be useful, if for instance //statements only need to be run if the condition is true:
for(..;..;..)
{
if(true)
{
goto dothis;
}
/* other statements */
return A;
dothis:;
//statements
return B;
}
The //statements need not be in the for loop with goto, for example:
for(..;..;..)
{
if(true)
{
goto dothis;
}
/* other statements */
}
return A;
dothis:;
//statements
return B;