Question

Invalid operands to binary expression (‘double’ and ‘double’) objective-c issue

-(double)performOperationWith:(double *)operand1 
                         And:(double *)operand2 {

    double result = 0.0;

    result = operand1 + operand2;

    return result;
}

Answer 1

They’re pointers, so you should dereference them:

result = *operand1 + *operand2;

Or change the function parameters:

-(double)performOperationWith:(double )operand1 And:(double )operand2 {...}