Practice Questions for Recursion | Set 1
Explain the functionality of following functions.
Question 1
int fun1(int x, int y) { if(x == 0) return y; else return fun1(x - 1, x + y); } |
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Answer: The function fun() calculates and returns ((1 + 2 … + x-1 + x) +y) which is x(x+1)/2 + y. For example if x is 5 and y is 2, then fun should return 15 + 2 = 17.
Question 2
void fun2(int arr[], int start_index, int end_index) { if(start_index >= end_index) return; int min_index; int temp; /* Assume that minIndex() returns index of minimum value in array arr[start_index...end_index] */ min_index = minIndex(arr, start_index, end_index); temp = arr[start_index]; arr[start_index] = arr[min_index]; arr[min_index] = temp; fun2(arr, start_index + 1, end_index); } |
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Answer: The function fun2() is a recursive implementation of Selection Sort.
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