Sum

The sum of two numbers is their value added together. This operation is called additive summation or addition. There are many ways of writing sums, including:

• Addition (${\displaystyle 2+4+6=12}$)
• Summation (${\displaystyle \sum _{k=1}^{3}k=1+2+3=6}$)
• Code:

Sum = 0

For I = M to N

Sum = Sum + X(I)

Next I (in Visual BASIC)