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I typed out the 1st java ExampleProgram exactly according to the instructions, but Command Prompt keeps saying 'error: cannot find symbol System.out.PrintIn(''Hello World");'
Also, my command prompt directly opens the in the User menu, by default (C:\Users\...).
I need help urgently. What do I do???
 1 Voto
 4 Respostasdef add(x, y):
    return x + y
def do_twice(func, x, y):
    return func(func(x, y), func(x, y))
a = 5
b = 10
print(do_twice(add, a, b))
Please explain step by step 
Which is caller here?
Explain the 3rd and 4th line ?
why in 4th line we write add(add(x,y),add(x,y)) which is function of 1st line ?
how can we write function after return statement insted of (x+y+x+y )=30?
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