If the integer value of each cell in the array contains more than one Sign :

int A[6] = {77,89,84,69,88,84};

#include <iostream>



int main()
{
    
    int A[6] = {77,89,84,69,88,84};
    int lengthA = 6;
    int num = 0;
    
    for(int x = 0; x < lengthA; x++)
    {
        
        num = num*10 + A[x];
    
    }
    
    
    std::cout<<"Result: "<<num;//Result: 8681864

    return 0;
}

Execution result:

8681864

instead of:

778984698884

The same result will be the execution of all other examples from the answers provided here, because they work according to the same principle.

How to solve this problem?