Beginner Java programming question....

[Watashi]

Scanner console = new Scanner(System.in);

int sum = 0;

for (int i = 1; i <= 100; i++) {

System.out.print("Type a number: ");

sum = sum + console.nextInt();

}

System.out.println("The sum is " + sum);

 

The following is some code that my instructor has provided for me. However there is one thing I am just not fully understanding. The value from the loop is i, so how does that get passed onto any other part of the program? It looks to me as though the Int sum, would be completely separate from the for loop.

[butler1233]

Yeah that's a really dumb code snippet.

 

It makes no sense whatsoever to use a for there. The value which iterates is unused, and you have to type 100 numbers before getting a huge number out at the end.

[panther420]

11 minutes ago, Doomerson said:

Scanner console = new Scanner(System.in);

int sum = 0;

for (int i = 1; i <= 100; i++) {

System.out.print("Type a number: ");

sum = sum + console.nextInt();

}

System.out.println("The sum is " + sum);

 

The following is some code that my instructor has provided for me. However there is one thing I am just not fully understanding. The value from the loop is i, so how does that get passed onto any other part of the program? It looks to me as though the Int sum, would be completely separate from the for loop.

The iterator doesn't necessarily have to be interacted with or accessed in the body of a for loop. For loops can be used as simple tools to execute a block of code multiple times, where the iterator (in your case i) isn't needed.

[MikeSK]

8 minutes ago, Doomerson said:

int sum = 0;

is declared and initialized outside and before the loop.
 

 

10 minutes ago, Doomerson said:

sum = sum + console.nextInt();

The first time through the loop sum = 0 + console.nextInt();

 

The loop executes for 100 times.

sum is your running total and finally outputs after the loop.

 

1 minute ago, panther420 said:

System.out.println("The sum is " + sum);

This is just an exercise.  Exercises based on real life can overly complex when you are trying to demonstrate programming.