can someone help me create a header file and main function, question asked for i

Question

can someone help me create a header file and main function,

question asked for integers from the keyboard in fixed-size array,array in reverse order,searches the largest number in the array and smallest.

code i got

List::List(){
   for(int i=0; i<100;i++){
      
       number[i]=0.0;
   }
}

void List::input(){
  
   string keyboard;
   double digit;
   int index=0;
  
   cout<<"Enter number ";
   cout<<"Enter number with a space ";

   getline(cin,keyboard);
  
   istringstream iss(keyboard);
  
   while(iss.good()){
      
       iss>> digit;
       number[index]=digit;
       index++;
   }
  
   endPoint=index;
   cout<   
   //display back
   for(int i=0;i       
       cout<

//reverse order
void List::reverse(int curIndex){
  
   if(curIndex>=0){
       cout<< number[curIndex]<<" ";
       reverse(curIndex-1);
   }
}

//largest number
void List::larNumber(int numList[],int first,int last){
  
if (first == last) {
  
cout<<"The largest number's index: "<< first< cout<<"The largest number: "<< numList[first]<   
} else if (numList[first] < numList[last]) {
   if(first< last){
     
       largestNumber(numList, first + 1, last);  
       }else if (first>last){
          
       largestNumber(numList, first - 1, last);
       }
} else if (numList[first] > numList[last]){
  
int temp= first;
first= last;
last= temp;
largestNumber(numList, first, last);
}
  
}

//smallest number
int List::kthSmallest(int numList[], int left,int right, int k){
   int i = left, j = right;
int tmp;
int pivot = numList[(left + right) / 2];

while (i <= j) {
while (numList[i] > pivot)
i++;
while (numList[j] < pivot)
j--;
if (i <= j) {
tmp = numList[i];
numList[i] = numList[j];
numList[j] = tmp;
i++;
j--;
}
};
if (left < j)
kthSmallest(numList, left, j,k);
if (i < right)
kthSmallest(numList, i, right,k);
  
return numList[endPoint-k];
  
}

Explanation / Answer

to reverse the array:

for the largest and smallest in an array:

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