I'm trying to increment the following sequence in a for loop (Java):
1, 4, 9, 16, 25 etc the difference increasing by two each time. I tried using 'i+=3 + i' but I know that's wrong since it doesn't take into account that the variable i changes along the sequence.
Any help? Thanks
You could have an increment of i+=k and change k inside the loop in order to change the increment.
int k=1;
for (int i=1;i<1000;i+=k) {
k+=2;
}
If your i is changing, the simple logic is, use another variable that is declared outside the scope of the loop. This will make sure that it is not recreated everytime the loop runs.
int num = 1;
for(int i=1; i<maxValue; num+=2,i+=num){
//Use the value of `i` here, it will be as you wanted.
}
The sequence is to start with j=1 and k=4 and then derive next values of the series n times. The formula as follow:
Initial loop (i=0):
j = 1, k = 4;
Loop (i > 0 less than n):
Repeat below n times:
temp = k;
k = k + (k - j + 2);
j = temp;
print value of j being the series;
I assume that you take n as input from user and then generate the series nth times. Let's look at the following code example
int n = 10;
for(int i = 0, temp = 0, j = 1, k = 4; i < n; i++, temp = k, k += (k-j+2), j = temp) {
System.out.println(j);
}
Assuming that user inputs n = 10, the loop initializes i = 0 and continues until i < n is satisfied. It initializes j = 1 and k = 4 and then execute the body of the loop (printing j) followed by backing up the value of k, calculating new value for k and replacing the old value of j. The output for n = 10 is as follow:
1
4
9
16
25
36
49
64
81
100
Read Series number from the user and generate series based on given number.
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
int ans;
for(int i = 1; i <= n; i++){
ans = i * i;
System.out.println(ans);
}
i += 3 + iwould givei = 3 + i + ikind of 1, 5, 13 ..