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Here why we use = sign, single + why not?
int sum_up (int x, int y) { x += y; return(x);
1 Answer
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BABLU TAUNWAL
x += y means x = x + y
If you use single + then it would be (x + y) which might be wrong because you have to assign (x + y) to another variable so (x += y) make sense because (x = x + y)