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C++ > Recursion Code Examples

Linear search program in c++ using recursion

Linear search program in c++ using recursion

    This program runs linear search recursively in an array c++ code

    Program takes size of array
    Input elements in array
    Passing array, key and size to the recursive function recursiveLinearSearch(int array[],int key, int size)
    Recursive function calls it self until certain conditions fulfill
    Function returns 1 if record found in array else returns -1

    #include<iostream>
    using namespace std;
  
    int recursiveLinearSearch(int array[],int key,int size){
    size=size-1;
      if(size <0){
      return -1;
      }
      else if(array[size]==key){
      return 1;
      }
      else{
      return recursiveLinearSearch(array,key,size);
      }
    }
 
    int main() {
  
      cout<<"Enter The Size Of Array:   ";
    int size;
    cin>>size;
    int array[size], key,i;
    
    // Taking Input In Array
    for(int j=0;j<size;j++){
    cout<<"Enter "<<j<<" Element : ";
    cin>>array[j];
    }
    //Your Entered Array Is
    for(int a=0;a<size;a++){
       cout<<"array[ "<<a<<" ]  =  ";
       cout<<array[a]<<endl;
    }
    cout<<"Enter Key To Search  in Array";
    cin>>key;
    int result;
    result=recursiveLinearSearch(array,key,size--);
    if(result==1){
    cout<<"Key Found in Array  ";
    }
    else{
    cout<<"Key NOT Found in Array  ";
    }
       return 0;
    }

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