ios - Converting float to NSNumber -


i missing basic, here. must have forgotten it. basically, have following code purpose take nsnumber, convert float, multiply 2 , return result nsnumber. error on last step, , stumped. should there.

nsnumber *testnsnumber = [[[nsnumber alloc] initwithfloat:200.0f] autorelease]; float myfloatvalue = [testnsnumber floatvalue] * -2; nslog(@" test float value %1.2f \n\n",myfloatvalue); [testnsnumber floatvalue:myfloatvalue]; // error here floatvalue not found

the method floatvalue of nsnumber not take parameters. if set new float number, need re-assign testnsnumber, because nsnumber not have mutable counterpart:

testnsnumber = @(myfloatvalue); // new syntax

or

testnsnumber = [nsnumber numberwithfloat: myfloatvalue]; // old syntax

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