Question

Given an array of length n and an integer x, you need to find and return the first index of integer x present in the array. Return -1 if it is not present in the array. First index means, the index of first occurrence of x in the input array.

Answer 1

Answer:

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Answer 2

Ans

Explanation:

#include<iostream>

using namespace std;

int first_index(int arr[],int size,int val,int real_size){

   

   if(size==0){

       return -1;

   }

   else if(*(arr)==val){

       return real_size-size+1;

   }

   int ans=first_index(arr+1,size-1,val,real_size);

   return ans;

}

int main(){

   int arr[7]={1,2,3,4,5,6,7};

   cout<<first_index(arr,7,4,7);

   return 0;

}