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++ operator
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closed with the note: undefined Behaviour in C 
#include<stdio.h>
int main()
{
	int i = 5;
	int a = ++i + ++i + ++i + ++i;
	printf("%d",a);
	return 0;
}

How is the output 31? and not 30? 

Shouldn’t it be 6+7+8+9?

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