How can i make this loop run only if the char array contains certain characters?

Question

char[] message = input.toCharArray ();

String x = "";
String encrypted2 = "";

for (int index = 0 ; index < message.length ; index++)
{
    message [index]++;
    message [index]++;
}

String encrypted = new String (message);

I need the for loop to run only if the char array contains letters from A to N.

Make a boolean indicator. Iterate the array and check each char. If any of them are not the ones you want, make the indicator false. Check the indicator before running your loop. — takendarkk
– takendarkk, Commented Dec 13, 2017 at 22:05

gparyani · Accepted Answer · 2017-12-13 22:34:15Z

1

You need a second loop before the loop in your code:

boolean cond = true;
for(int i = 0; cond && i < message.length; i++) {
    if(message[i] < 'A' || message[i] > 'N')
        cond = false;
}
for (int index = 0 ; cond && index < message.length ; index++)
{
    message [index]++;
    message [index]++;
}

The first loop goes through and checks if all the characters are A through N, and upon finding a character that's not, stops checking the rest of the array and doesn't execute the loop.

answered Dec 13, 2017 at 22:34

gparyani

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