[SOLVED] Using powers based on user input

curious95 · 11-28-2012, 01:14 AM

i noticed that C does not have an exponentiation operator. So i was wondering how does one add a power to variable which is based on user input? example:

Code:

int x;
scanf("%d", &x);
printf("%d",xe2 + xe5);

where e is an exponentiation character, on a calculator e would be ^. (so x^2 + x^5)

JohnGraham · 11-28-2012, 02:07 AM

There's the function pow() (and associated powf() and powl()) in math.h.

acid_kewpie · 11-28-2012, 02:07 AM

ok, so use "e" is pretty chuffing confusing given e referes to the exponentiation function / inverse natural log. ^ would mean power normally, not exponent, so 2^5 is 25, not 200000, which is 2 x 10^5.

Use the math.h library, with the pow() function (which also contains exp() for the real e() function)

curious95 · 11-28-2012, 05:41 AM

understood, thanks for the answers