Java Examples - Summation of Numbers

Problem Description

How to print summation of numbers ?

Solution

Following example demonstrates how to add first n natural numbers by using the concept of stack.

```import java.io.IOException;

public class AdditionStack {
static int num;
static int ans;
static Stack theStack;
public static void main(String[] args)

throws IOException {
num = 50;
System.out.println("Sum = " + ans);
}
public static void stackAddition() {
theStack = new Stack(10000);
ans = 0;
while (num > 0) {
theStack.push(num);
--num;
}
while (!theStack.isEmpty()) {
int newN = theStack.pop();
ans += newN;
}
}
}
class Stack {
private int maxSize;
private int[] data;
private int top;
public Stack(int s) {
maxSize = s;
data = new int[maxSize];
top = -1;
}
public void push(int p) {
data[++top] = p;
}
public int pop() {
return data[top--];
}
public int peek() {
return data[top];
}
public boolean isEmpty() {
return (top == -1);
}
}
```

Result

The above code sample will produce the following result.

```Sum = 1275
```

The following is an another example of first n natural numbers

```public class Demo {
public static void main(String[] args) {
int sum = 0;
int n = 50;
for (int i = 1; i <= n; i++) {
sum = sum + i;
}
System.out.println("The Sum Of " + n + "is" + sum);
}
}
```

The above code sample will produce the following result.

```The Sum Of 50 is 1275
```
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