objective c - "initializer element is not a compile-time constant" when assigning results of basic math operation in Xcode -

int x = 10; float y= 3.5; float z =x*y; 

i enter error xcode doesn't recognize * , says "initializer element not compile-time constant" what's happening? (i complete beginner btw.)

the problem you're declaring these @ file scope. global variables have initialised @ compile time, not runtime, , aren't allowed initialise them other variables.

if declare these in function there no problem. if you're using constants anyway, can initialise z directly 35.0.