recursive finding index of the min number in array??

This is a discussion on recursive finding index of the min number in array?? within the C Programming forums, part of the General Programming Boards category; Code: int min_num(int arr[],int index, int minIndex, int size){ if (index==size) return minIndex; else if (arr[index]<arr[minIndex]) minIndex=index; min_num(arr,index+1,minIndex,size); } size=4; ...

  1. #1
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    recursive finding index of the min number in array??

    Code:
    int min_num(int arr[],int index, int minIndex, int size){
    
    	if (index==size)
    		return minIndex;
    	else
    		if (arr[index]<arr[minIndex])
    			minIndex=index;
    
    	
    	min_num(arr,index+1,minIndex,size);
    }
    size=4;
    index=1;
    minindex=1;

    if i have array={3,2,5,1}
    i need find index of the minimum number in the array

    minIndex=3, because 1 is the minimum number,,
    but this returning 0!! why??
    how i can return 3!!???

  2. #2
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    array subscripts start at zero in C so go over this again
    Code:
    if (index==size)
    Edit: never mind I did not read the code only the section below.

    size=4;
    index=1;
    minindex=1;
    Last edited by itCbitC; 01-17-2009 at 11:48 AM.

  3. #3
    Registered User
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    Your missing a return for your recursive steps. the last line should be return followerd by your function call.
    It is too clear and so it is hard to see.
    A dunce once searched for fire with a lighted lantern.
    Had he known what fire was,
    He could have cooked his rice much sooner.

  4. #4
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    Code:
    int min_num(int arr[],int index, int minIndex, int size){
    
    	if (index==size)
    		return minIndex;
    	else
    		if (arr[index]<arr[minIndex])
    			minIndex=index;
    
    	
    	return min_num(arr,index+1,minIndex,size);
    }
    it doesn`t help
    still returning 0!!

  5. #5
    The larch
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    How do you call it? Post the main function.
    I might be wrong.

    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
    Quoted more than 1000 times (I hope).

  6. #6
    DESTINY BEN10's Avatar
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    since array indexing starts at 0,thus u should pass the value of index as 0.if index=1 is passed the code will start comparing the elements from arr[1] leaving the first element ignored.also if u're calling this function from main it should return its value to some variable and that variable should get printed.
    in main
    Code:
    k=min_num(arr,0,1,4);
    hope it helps.
    Last edited by BEN10; 01-18-2009 at 06:16 AM.

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