How to stop IF slippage in C#?

Question

C++ / C#

There is such a code

if (value > 0.5 && value < 0.75);
                                        value = value + onePercent * 150;
                                        
                                    if (value > 0.75 && value < 1);
                                    value = value + onePercent * 125;
                                    
                                    if (value > 1 && value < 2);
                                    value = value + onePercent * 100;

The bottom line is, value (number) slips through all IFs, and is multiplied on each operation.
That is, the number 3.05 turns into 25.19.
How to "stop" the multiplication after the first function?
Thank you.

Answer 1

instead of the second and third if use else if

if () {
} else if () {
}

Answer 2

No, no, no, not like this:

if (value > 0.75 && value < 1);
                                    value = value + onePercent * 125;

But like this:

if (value > 0.75 && value <= 1) {
                                    value = value + onePercent * 125;
}

or, at worst, like this:

if (value > 0.75 && value <= 1) 
                                    value = value + onePercent * 125;

Look, you have a semicolon after the condition, which means that the conditional statement is over here, and the next line will always be executed.
And write the conditions so that they cover the entire range, i.e. if you have a condition x < 1.0 in one if, then the next should have x >= 1.0 or vice versa, or better use if... else...