GATE CSE 2011 | Question: 48

Question

Consider the following recursive C function that takes two arguments.

unsigned int foo(unsigned int n, unsigned int r) {
    if (n>0) return ((n%r) + foo(n/r, r));
    else return 0;
}

What is the return value of the function $\text{foo}$ when it is called as $\text{foo(345, 10)}$?

• A. $345$
• B. $12$
• C. $5$
• D. $3$

Comments

Sum of the digits in the given decimal number 345, 3+4+5 = 12 is the correct option.

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would the answer have been any different for signed int ?

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No, it will remain same.

Answer 1

Red colour represents return values.

Answer is 12.

Answer 2

A) The function returns the sum of digits of the given number.

so 5+4+3 = 12

Answer 3

Following recursive calls