calculateProductNumbersRange()

Step 1:

Start by defining a function called calculateProduct in Java. This function should take two integer parameters, representing the start and end of a range of numbers. We'll name these parameters beginRange and endRange.

public long calculateProduct(int beginRange, int endRange) {
}

Step 2:

Inside the function, we need to calculate the product of all the integers within the provided range. Before jumping into the product calculation, let's initialize a variable that will hold this value. We'll name this variable product, setting its initial value to 1.

public long calculateProduct(int beginRange, int endRange) {
long product = 1;
}

Step 3:

Now, still within the function, let's write a for loop to iterate over our range. The loop's counter will start at beginRange and run until it's equal to endRange.

public long calculateProduct(int beginRange, int endRange) {
long product = 1;
for (int i = beginRange; i <= endRange; i++) {
}
}

Step 4:

Within our for loop, multiply the variable product by the current counter value (i) in each iteration. This will calculate the product progressively.

public long calculateProduct(int beginRange, int endRange) {
long product = 1;
for (int i = beginRange; i <= endRange; i++) {
product *= i;
}
}

Step 5:

Finally, let's return the product variable at the end of our function.

public long calculateProduct(int beginRange, int endRange) {
long product = 1;
for (int i = beginRange; i <= endRange; i++) {
product *= i;
}
return product;
}

And now you have a function that will calculate the product of all the numbers in a provided range!