Why my code cannot function?

Question

https://code.sololearn.com/c1Jict45nJON/?ref=app

Answer 1

You should not add a and b to d before cin.

int a,b, d;
cin >> a >> b;
d = a + b;
cout << d;

Answer 2

We want to take user input, and then add the two numbers, not the other way around.

Answer 3

Exactly. Check on what garbage values in uninitialised variables are:

https://www.quora.com/What-do-you-mean-by-a-garbage-value-in-a-variable

Answer 4

thank you very much! 😀Hatsy Rei

Answer 5

I have a idea! (when "d=a+b is before cin) Is it becuz at that moment, variable a and variable b have no value?So the value of variable d become something weird.No help if I assign a and b some value. Am I right?

Answer 6

Is it the format? or there is other explanation?