Amount of zeros at the end of an array with recursions

I want to count how many zeros are at the end of the array using recursions. But I’m having problems with an array with all of it’s elements equal to 0 because it’s giving me the wrong answer.

I’ve tried putting the position in the range (0,v.length-1], putting one of the two conditions and not putting said range

Here’s what I’ve done so far

public static int Ejercicio22f(int[] v,int pos){
        if(pos<=v.length-1){
            if(v.length==0){return 0;}
            else if(v.length==1){
                if(v[v.length-1]!=0){return 0;}
                else{return 1;}
            } else{
                if(v[pos]==0 && pos>0){return 1+Ejercicio22f(v,pos-1);}
                else if(v[0]==0){return v.length;}
                else{return 0;}
            }
        } else{return Ejercicio22f(v, v.length-1);}
    }

>Solution :

Try this:

public static int Ejercicio22f(int[] v, int pos) {
    if (pos == 0) {
        if (v[pos] == 0) {
            return 1;
        } else {
            return 0;
        }
    } else {
        if (v[pos] == 0) {
            return Ejercicio22f(v, pos - 1) + 1;
        } else {
            return 0;
        }
    }
}

On first run, pass in v.length - 1 as the pos argument.