Ans:
a) i is -10
b) i is not 0

Condition statements in C/C++ language are treated as TRUE if it is not FALSE or not zero. And FALSE when it is zero.
In the first case i is -10 which not zero, thus the condition is true.
In the second case i is zero, thus the condition is false and execution goes to the else statement.

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sizeof void, if, if-else, if-else-if, label and goto, switch case, compare with ==, execution sequence, loop statements, for, while, do-while loop syntax,

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