First_Index_of_Number.cpp

/*
Problem:
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.
Do this recursively. Indexing in the array starts from 0.
Input Format :
Line 1 : An Integer N i.e. size of array
Line 2 : N integers which are elements of the array, separated by spaces
Line 3 : Integer x
Output Format :
first index or -1
Constraints :
1 <= N <= 10^3
Sample Input :
4
9 8 10 8
8
Sample Output :
1

CODE:
*/
int firstIndex(int input[], int size, int x) {
 for(int i=0;i<size;i++){
     if(input[i]==x){return i;}
 }
return -1;
}