How can I restart while loop after certain condition (if) satisfied in c++?

Question

I have a lot of if statements in while loop, program has to print error messages according to conditions, but if there are more than one error it has to be only one of them.

Solution

Your question isn't very detailed so it's a little hard to tell what exactly do you want.

If you want the while loop to go to the next iteration after any error has fired, you should use the continue statement:

while( something )
{
    if( condition )
    {
        //do stuff
        continue;
    }
    else if( condition 2 )
    {
        //do other stuff
        continue;
    }
    <...>
}

If nothing else than these ifs is inside the loop, and the conditions are integer values, you should consider using switch instead:

while( condition )
{
    switch( errorCode )
    {
        case 1:
        //do stuff;
        break;
        case 2:
        //do other stuff;
        break;
        <...>
    }
}

If you want to completely restart the cycle... well this is a little harder. Since you have a while loop, you can just set the condition to it's starting value. For example, if you have a loop like this:

int i = 0;
while( i < something )
{
    //do your stuff
    i++;
}

then you can "reset" it like this:

int i = 0;
while( i < something )
{
    //do your stuff
    if( something that tells you to restart the loop )
    {
        i = 0;//setting the conditional variable to the starting value
        continue;//and going to the next iteration to "restart" the loop
    }
}

However, you should be really careful with this, it's easy to get an infinite loop accidentally.

Comments

[SingerOfTheFall]

Hm, I believe this is what the OP needs to get rid off actually.

[fhuseynli]

it is not about all integer, command includes string, integer, double. According to priority of the error, only one error has to be appeared on terminal. but mine is like puts every error on terminal

[SingerOfTheFall]

@user, then just use else ifs with a continue statement in each to go to the next iteration after any error is put.

[Shashwat]

In the first code, no need of continue statement

[SingerOfTheFall]

@Sha, I was waiting for this comment. We don't know if there is any other code after a number of if statements. If there is no - you are right. If there is - the continue is needed.

[Shashwat]

You are right. I also thought so. But he didn't write any code. So we didn't know.