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Old 11-28-2012, 01:14 AM   #1
curious95
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Post Using powers based on user input


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)
 
Old 11-28-2012, 02:07 AM   #2
JohnGraham
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There's the function pow() (and associated powf() and powl()) in math.h.
 
Old 11-28-2012, 02:07 AM   #3
acid_kewpie
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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)
 
Old 11-28-2012, 05:41 AM   #4
curious95
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understood, thanks for the answers
 
  


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