[Solved] Running a Search Array

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First you might change your if condition because you already test one time your searchArray == arr[i]

if (searchArray == arr[i]) {
    cout << "Found value " << searchArray << " at index " << i << ", taking " << counter << " checks !";
    if (counter == 1) {
       cout << "We ran into the best case scenario! " << endl;
    }else if(counter == dimension) {
        cout << "We ran into the worst-case scenario!" << endl; 
    }   
}

For checking if you found the value or not, I will probably use a boolean

find = false;    

for (int i = 0; i < dimension; i++) {
   counter = counter + 1;

   if (searchArray == arr[i]) {
       cout << "Found value " << searchArray << " at index " << i << ", taking " << counter << " checks !";
       find = true;
       if (counter == 1) {
           cout << "We ran into the best case scenario! " << endl;
       }else if(counter == dimension) {
           cout << "We ran into the worst-case scenario!" << endl; 
       }   
   } 
}
if (!find){
    cout << "The value v was not found in the array!" << endl;
}

solved Running a Search Array