FRQ 2017

(a)

This frq is trying to go over how to use specific methods and alter them in order to change a substring

• the method replaceNthOccurrence is asked to be written to change the nth occurrence of a substring with a replacement string, str with repl

• Methods:

A method in Java is a block of code that, when called, performs specific actions mentioned in it. You can insert values or parameters into methods, and they will only be executed when called. A method is similar to a function.

• Control Structures:

Control Structures can be considered as the building blocks of computer programs. A program is usually not limited to a linear sequence of instructions since during its process it may bifurcate, repeat code or bypass sections.

public void replaceNthOccurrence(String str, int n, String repl){
    int i = findNthOccurrence(str, n);
    if(i != -1)
    {
        String a = currentPhrase.substring(0, i); 
        //find the string from first index up till i

        String b = currentPhrase.substring(i+str.length());
        //everything after the str

        currentPhrase = a + repl + b;

    }
}

Answer for (a)

//Part (a)
public void replaceNthOccurrence(String str, int n, String repl)
{

int loc = findNthOccurrence(str, n);

if (loc != -1)
{
currentPhrase = currentPhrase.substring(0, loc) + repl + currentPhrase.substring(loc + str.length());
}
} 
//comments on things