Error : Expression must have integral or enum type

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In a Vincenty Direct Formula, there is an expression

C++

lon2 = (lon1.toRad()+L+3*Math.PI) % (2*Math.PI) - Math.PI; 

/* Where lon2, lon1 is in degrees,L in double, Math.PI(Predefined value for PI) is a constant double */

But there is an error that says: "Expression must have integral or enum type" and also shows that the left hand side of % has a double and right hand side has a constant double. But that is the formula. How do I get rid of this?

Posted 24-Apr-12 22:58pm

Sumal.V

Updated 24-Apr-12 23:05pm

Richard MacCutchan

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2 solutions

Solution 1

So? A Double % a Double gives a Double, doesn't it? So if it expects an integer for lon2 it will complain unless you cast it to an integer explicitly.

Posted 24-Apr-12 23:04pm

OriginalGriff

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Jochen Arndt · Accepted Answer · 2012-04-24T23:09:00

Solution 2

The modulo operator % can't be used with floating point operands. Use the fmod() function to calculate the remainder for floating point values.

Posted 24-Apr-12 23:09pm

Jochen Arndt

Comments

Sumal.V 25-Apr-12 5:34am

Thank u very much :)