C Programming
What is the difference between a declaration and a definition of a variable?

There is no difference between them.
Both can occur multiple times, but a declaration must occur first.
Both can occur multiple times, but a definition must occur first.
A declaration occurs once, but a definition may occur many times.
A definition occurs once, but a declaration may occur many times.

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C Programming
What is the right choice, if the following loop is implemented?void main(){ int num = 0; do{ --num; printf("%d", num); }while( ++num >= 0 );}

Prints the value of 0 one time only.
The loop will run infinitely many times.
There will be a compilation error reported.
A run time error will be generated.
The program will not enter into the loop.

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