Question

Consider the following C program:

int sub(int *sum)

{ *sum =*sum +*sum;

return 10; }

void main() {

int num= 3;

num = sub(&num)+ num;

}

What is the value of num after the assignment statement in main, assuming

operands are evaluated left to right.

operands are evaluated right to left.

Answer 1

by function definition :

int sub(int *sum)

{ *sum =*sum +*sum;

return 10; }

we see that whatever value we pass to this function, it will return 10 irrespective of the value of sum.

main function:

void main() {

int num= 3;

num = sub(&num) + num;

}

value of num

will be value returned by sub function + num

num is initialised by 3

so as we have seen sub function will return 10 and value of num is 3

so statement is

10 + 3

operands are evaluated left to right.

operands are evaluated right to left.

these will not make any difference as there is only one operator and value calculated from left to right or right to left will be same.

so answer for given problem for both the cases will be : 13.

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