calculating a percentage

[jimberger]

Hello,

I am trying to caluclate the percentage, i am doing

float percentage;
float number1;
float number2;

percentage = (number1 / number2) * 100;

However percentage is always 0 because it is not giving me the answer to 2 dp. I know you can use cout << setprecision(2) << percentage << endl;
but i am not outputting percentage straight away - i am passing the variable to another function before outputting.

Any ideas on how to solve this?
Thanks for your help
jim

 

[Zyrenthian]

well instead of the decimal... why not multiply it by 100 first?

(number1*100)/number2

then you could manipulate it as you wanted.

Matt

 

[xwb]

Have you checked what numbers you are putting in for number1 and number2? It is possible that these aren't set correctly.

 

[BoulderBum]

To round the number to 2 decimal places do this:

percentage = ( floor((number1 / number2) * 100 + .5 ) ) / 100;

which for 2/3 (.66666666...) will give you .67 . If you simply want 67, then omit the &quot;/100&quot;.

 

[pankajkumar]

(number1/number2)*100 would give percentage as said by BoulderBum