70. Predict the output or error(s) of the following c code

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 main()
	{
		int i=-1;
		-i;
		printf("i = %d, -i = %d \n",i,-i);
	}

Answer:
i = -1, -i = 1

Explanation:
-i is executed and this execution doesn’t affect the value of i. In printf first you just print the value of i. After that the value of the expression -i = -(-1) is printed.