Why won't arr as a variable work?

[John McFarland]

So for some reason whenever I try to compile this an error message shows near arr on line 72. I could use any help I could get. Thanks.

//Assignment 7
#include<iostream>
using namespace std;
void read_3_arrays(int r1[],int r2[],int r3[],int k);
void print_1_array(int nums[],int k);
void make_new_array(int r1[],int r2[],int r3[],int k,int sum[]);
void sort_1_array(int r[],int k);
void print_2nd_largest_and_smallest(int r[],int k);
void closest(int r[],int v, int k);
int main()
{
    int n,q=16,i;
    
    cout<<"How big is the array?"<<endl;
    cin>>n;
    
    
    int round1[n+25],round2[n+25],round3[n+25];
    int sots[n+25];
    int smallest, pos, arr ,chosen;
    
    
    read_3_arrays(round1,round2,round3,n);
    
    cout<<" "<<endl; 
    
    cout<<"Round 1."<<endl;
    print_1_array(round1,n);
    cout<<" "<<endl;
    
    cout<<"Round 2."<<endl;  
    print_1_array(round2,n);
    cout<<" "<<endl;
    
    cout<<"Round 3."<<endl;
    print_1_array(round3,n);
    cout<<" "<<endl; 
       
    make_new_array(round1,round2,round3,n,sots);
    
    
    
    sort_1_array(round1,n);  
    cout<<"Here is the Round 1 array in sorted order."<<endl;
    print_1_array(round1,n);
    print_2nd_largest_and_smallest(round1, n);
    cout<<endl;
    
    sort_1_array(round2,n);  
    cout<<"Here is the Round 2 array in sorted order."<<endl;
    print_1_array(round2,n);
    print_2nd_largest_and_smallest(round2, n);
    cout<<endl;
    
    sort_1_array(round3,n);  
    cout<<"Here is the Round 3 array in sorted order."<<endl;
    print_1_array(round3,n);
    print_2nd_largest_and_smallest(round3, n);
    cout<<endl;
    
    sort_1_array(sots,n);  
    cout<<"Here is the SumofThescores array in sorted order."<<endl;
    print_1_array(sots,n);
    print_2nd_largest_and_smallest(sots, n);
    cout<<endl;
    
    
    
        for(i=1;1<=q;i++)
    {
        cout<<"Choose an Array"<<endl;
        cin>>arr>>endl;
        cout<<"Choose a number"<<endl;
        cin>>chosen_number>>endl;
        
        if(arr==1)
                closest(round1,chosen,n);
                
        if(arr==2)
                closest(round2,chosen,n);
                
        if(arr==3)
                closest(round3,chosen,n);
                
        if(arr==4)
                closest(sots,chosen,n);
    
    
    
    }

    
    system("Pause");
}


///////////////////////////////////////////////////////////////////////////////
//Functions
///////////////////////////////////////////////////////////////////////////////


//Reads info into the arrays: round 1, 2, and 3.
void read_3_arrays(int r1[],int r2[],int r3[],int k)
{
    int lc;
    for(lc=1;lc<=k;lc++)
    {
    
        cout<<"Enter your three rounds"<<endl;
        cin>>r1[lc-1];
        cin>>r2[lc-1];
        cin>>r3[lc-1];
        
        cout<<"Your scores for the 3 rounds were;"<<endl;
        cout<<r1[lc-1]<<endl;
        cout<<r2[lc-1]<<endl;
        cout<<r3[lc-1]<<endl;
        
    }
    
    return;
}

//Prints the arrays on a 6 space grid.
void print_1_array(int nums[],int k)
{
     int lc;
     
     for(lc=1;lc<=k;lc++)
     {
          if (lc%6 != 0)
          {
               cout<<nums[lc-1]<<"  ";
          }
          else
          {
               cout<<nums[lc-1]<<endl;
          }
     }     
     cout<<" "<<endl;
     
     return;
}


//Adds the sum of the elements to another array. 
void make_new_array(int r1[],int r2[],int r3[],int k,int sum[])
{
     
     int lc;
     for(lc=1;lc<=k;lc++)
     {
          sum[lc-1]=r1[lc-1]+r2[lc-1]+r3[lc-1];
          
          
     }
     return;
}


//Sorts the numbers in an array into ascending order.
void sort_1_array(int r[],int k)
{
    int temp, lc, other;
    
    for(lc=1;lc<=k;lc++)
    {
        for(other=1;other<=k;other++)
        {
                if(r[lc-1]<r[other-1])
                {
                temp=r[lc-1];
                r[lc-1]=r[other-1];
                r[other-1]=temp;
                }
        }
    }

    
} 

void print_2nd_largest_and_smallest(int r[],int k)
{
    cout<<"The largest number is "<<r[k-1]<<endl;
    cout<<"The second largest number is "<<r[k-2]<<endl;
    cout<<"The smallest number is "<<r[0]<<endl;
    cout<<"The second smallest number is "<<r[1]<<endl;
}

void closest(int r[],int v, int k)
{

    int lc;
    
    if(v<r[0])
        cout<<"The lowest element, which is "<<r[0]<<" is the closest to the number you chose, which was "<<v<<"."<<endl;
    if(v>r[k])
        cout<<"The highest element, which is "<<r[k]<<" is the closest to the number you chose, which was "<<v<<"."<<endl;
        
    for(lc=1;lc<=k;lc++)
    {
        if(v==r[lc-1])
            cout<<"The number you chose, which is "<<v<<", is in the array at position "<<lc-1<<"."<<endl;
    }
    
    for(lc=1;lc<=k;lc++)
    {
        if(v>r[lc-1] && v<r[lc])
            cout<<"The number you chose, which is "<<v<<", is between the elements in position "<<lc-1<<" and "<<lc<<"."<<endl;

      }         
}
        
        
        
        
        
        

[Peter87]

cin>>arr>>endl;
should be
cin>>arr;

[o3hC5Di1]

As Peter mentioned, lines 71 -> 74 should be:

cout<<"Choose an Array"<<endl;
cin>>arr;
cout<<"Choose a number"<<endl;
cin>>chosen_number;

Also, you need to declare chosen_number and #include <stdlib> if you really must use system().

Hope that helps,
All the best,

NwN

[ResidentBiscuit]

cin>>arr>>endl;
Out of curiosity, because I've never seen this, what will happen here? Will this stick a newline character into the input stream, or will this just not compile?

[Peter87]

It will not compile.

[John McFarland]

Thanks guys, this actually helped a lot. Though now I'm curious, (not that this was my original intent) but how would I put a new line character into an input? And would it matter?