Help with this code for smallest and largest

[iAk3T05o]

This is the code o found on the net:

int max = 0;
int min = 0;
int arrai[5];

for (int i = 0; i<5; ++i)
{
cout << "enter value " << i << ": ";
cin >> arrai[i];

if (arrai[i] > max)
{
max = arrai[i];
}

min = max;

if (arrai[i] < min)
{
min = arrai[i];
}
}
cout << "largest is " << max;

cout << "lowest is " << min;
 

It does what i want if the last element is not the largest. I don't really understand the code either.
Can you use any example to find the largest and smallest element in an unsorted array and explain.
Thanks.

[Stewbond]

This doesn't sort. It just finds the smallest largest values.

Comments describe what's going on:

int max = 0;  // self-explanitory
int min = 0;  // self-explanitory, but I would init to a large number
int arrai[5]; // self-explanitory

// iterate through five values
for (int i = 0; i<5; ++i)
{
  cout << "enter value " << i << ": ";
  cin >> arrai[i]; // input a value

  if (arrai[i] > max) // if the input is the largest so far
  {
    max = arrai[i]; // then save it
  }

  min = max; // this doesn't make sense

  if (arrai[i] < min) // if the input is smaller than the last min value
  {
    min = arrai[i]; // then save it
  }
}
cout << "largest is " << max; // report max

cout << "lowest is " << min; // report min 

This might be easier to read. It's pretty much the same and you don't need an array when you only have one loop:

int max = 0, min = 999, input;
for (int i = 0; i < 5; ++i)
{
  cout << "enter value " << i << ": ";
  cin >> input;
  
  if (input > max)
    max = input;
  if (input < min)
    min = input;
}
cout << "largest is " << max;
cout << "lowest is "  << min;

[iAk3T05o]

i need it done with an array

[vasilenko93]

I suggest a for loop to get the input, and another for loop to find the min and max. Also after you enter the values I suggest setting the default value of min and max to arrai[0];

int max = 0;
int min = 0;
int arrai[5];

for ( int i = 0; i < 5; i++ )
{
    cout << "enter value " << i << ": ";
    cin >> arrai[i];
}
max = arrai[0];
min = arrai[0];
for ( int i = 0; i < 5; i++ )
{
    if (arrai[i] > max)
    {
        max = arrai[i];
    }
    if (arrai[i] < min)
    {
        min = arrai[i];
    }
}
cout << "largest is " << max << endl;

cout << "lowest is " << min << endl;

[iAk3T05o]

Vasilenko, that works.
Thanks.

Time to try it with a struct

[Stewbond]

struct Stuff{
  int max = 0;
  int min = 0;
  int arrai[5];
} stuff;

for ( int i = 0; i < 5; i++ )
{
    cout << "enter value " << i << ": ";
    cin >> stuff.arrai[i];
}
stuff.max = stuff.arrai[0];
stuff.min = stuff.arrai[0];
for ( int i = 0; i < 5; i++ )
{
    if (stuff.arrai[i] > stuff.max)
    {
        stuff.max = stuff.arrai[i];
    }
    if (stuff.arrai[i] < stuff.min)
    {
        stuff.min = stuff.arrai[i];
    }
}
cout << "largest is " << stuff.max << endl;

cout << "lowest is " << stuff.min << endl;

[eyenrique]

Enter value #1 :3
Enter value #2 :-1
Enter value #3 :7
Enter value #4 :10
Enter value #5 :4

Largest 10
Smallest -1

//LargestSmallest.cpp
//##

#include <iostream>
using std::cout;
using std::cin;
using std::endl;



int main(){

int const ARRAY_SIZE=5;
int max=0;
int min=0;
int array[ARRAY_SIZE]={};
        

for(int i=0;i<ARRAY_SIZE;i++){
        cout<<"Enter value #"<<i+1<<" :";
        cin>>array[i];

        if(i==0){ //first input is the largest and smallest number by default 
                max=array[i];
                min=array[i];
        }else{ //is not the first input then compare the numbers
                if(array[i]<min) //if the current input is less than the min number
                        min=array[i]; //store current number in min
                if(array[i]>max) //if current number is greater than max number
                        max=array[i]; //store in max 
        }//end if..else


}//end outer for

//prints largest -max- and smallest -min- numbers
cout<<"\nLargest "<<max<<endl;
cout<<"Smallest "<<min<<endl;


return 0; //indicates success
}//end of main 

[vasilenko93]

@Stewbond
It does not help Nathan learn C++ if you just do it for him. He wanted to try rewriting our code with structures, now he will just copy and paste it.

[iAk3T05o]

thanks for the struct code but i needed to try it myself first.