Execute a block of code based on the result of an expresssion that utilizes relational or logical (boolean) operators

If Statement:

            int anint = 1;
            if (anint >= 0)
            {
                // Execute some code
            }

If Else Statement:

            int anint = 1;
            if (anint >= 0)
            {
                // Excute some code
            } 
            else
            {
                // Execute some other code
            }   

If, Else If, Else:

            int anint = 1;
            if (anint >= 0)
            {
                // Execute some code
            }
            else if (anint < -1)
            {
                // Execute some other code
            }
            else
            {
                // Execute this code if none of the other conditions are true
            }

You can use the boolean operations to use boolean logic on multiple expressions.

            int anint = 1;
            int anotherint = 2;
            if (anint > 0 && anotherint <= 2)
            {
                // Execute some code
            }