CODEWITHSUNDEEP
c++loopswhile-loop
BrianZhang
BrianZhang

Reputation: 153

What is the most efficient way to execute code if a while loop runs at least once?

I have a while loop, and I want some line of code to be run if the while loop runs at least once. If the while loop does not run, I want to skip this line of code.

while(condition) {
  doSomething();
}
doSomethingElse(); 
/* Only run doSomethingElse() if the while loop ran
at least once */

I could set a bool to false before it runs, and set it to true when it runs, but to me it feels a little messy. Also, this while loop is inside a function that can run up to 10^6 times, and it has time constraints, so I want it to run as efficiently as possible. Is there any way to do this?

*note: Do not confuse this with a do-while loop which runs at least once no matter what. I want a line of code that runs only if the while loop is run at least once.

Upvotes: 1

Views: 677

Answers (2)

user16291710
user16291710

Reputation: 

int count=0;
while(condition) {
    doSomething();
    count=count+1;
}if(count >=1) {
    // Enter the block of code that you want to run at least once }

Upvotes: 0

Vlad from Moscow
Vlad from Moscow

Reputation: 310990

It seems you mean

if ( condition )
{
    while(condition) {
       doSomething();
    }
    doSomethingElse(); 
}

Or

if ( bool b = condition )
{
    while( b) {
       doSomething();
       b = condition;
    }
    doSomethingElse(); 
}

or

if ( condition )
{
    do {
       doSomething();
    } while ( condition );
    doSomethingElse(); 
}

Upvotes: 5

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