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.

Answer 1

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.