Comparing numbers to c

[enemy]

Please, why I get numbers which are not array values?

Many thanks!

#include<iostream>
using namespace std;


int main(){


int c=40;
int array_f[5]={17, 19, 23, 29, 31};
cout<<array_f[0]<<" "<<array_f[1]<<" "<<array_f[2]<<" "<<array_f[3]<<" "<<array_f[4]<<endl<<endl;

 if (c<array_f[0]){
    cout<<array_f[0]<<endl;
 }


 if (c>array_f[4]){
    cout<<array_f[4]<<endl;
 }


 for (int j=0;j<5;j++) {

     if (c>=array_f[j]) {

               if (c-array_f[j]<=array_f[j+1]-c){
                            cout<<array_f[j]<<" "<<"@"<<endl;
               }


                                        else {
                                           cout<<array_f[j+1];
                                        }
             break;
     }
        
 }
return 0;
 }

[nvrmnd]

what values do you get, when i run this it seems okay :

17 19 23 29 31

31
19

[hoity]

What is your expected output?

[keskiverto]

Loop on line 22 iterates the case j==4.
=>
Condition on line 26 will and statement on line 32 can dereference element array_f[5], which does not exist.