Thread: trouble with arrays returning false values

I am trying to give an array some values and print them out ..

I initialise the elements to zero first .. after that I put values in .. then try print them out ..

the code compiles and runs .. Im getting the wrong values though so if anyone could spot where the error is I would appreciate it thanks ..

this is my code.

Code:

#include<iostream>

using namespace std;

int main( int argc, char **argv){

  long double arrayA[1];
  long double arrayB[1];
  long double arrayC[1];

  // initialise all elements in array to zero and check this happens

  arrayA[0] = 0;
  arrayA[1] = 0;

  cout<< "initial arrayA" << "\n" << arrayA[0] <<"\n";
  cout<< "initial arrayA" << "\n" << arrayA[1] <<"\n";

  arrayB[0] = 0;
  arrayB[1] = 0;

  cout<< "initial arrayB" << "\n" << arrayB[0] <<"\n";
  cout<< "initial arrayB" << "\n" << arrayB[1] <<"\n";

  arrayC[0] = 0;
  arrayC[1] = 0;
  
  cout<< "initial arrayC" << "\n" << arrayC[0] <<"\n";
  cout<< "initial arrayC" << "\n" << arrayC[1] <<"\n";
     
  // that worked out fine so now put values in array and check that they are 
  // ok ..
 
  arrayA[0] = 3;
  arrayA[1] = 6;

  cout<< "mid arrayA" << "\n" << arrayA[0] <<"\n";
  cout<< "mid arrayA" << "\n" << arrayA[1] <<"\n";

  arrayB[0] = 9;
  arrayB[1] = 12;

  cout<< "mid arrayB" << "\n" << arrayB[0] <<"\n";
  cout<< "mid arrayB" << "\n" << arrayB[1] <<"\n";

  arrayC[0] = 15;
  arrayC[1] = 18;
    
  cout<< "mid arrayC" << "\n" << arrayC[0] <<"\n";
  cout<< "mid arrayC" << "\n" << arrayC[1] <<"\n";
    
  // that worked ok final check to make sure

  cout<< "last arrayA" << "\n" << arrayA[0] <<"\n";
  cout<< "last arrayA" << "\n" << arrayA[1] <<"\n";
  
  cout<< "last arrayB" << "\n" << arrayB[0] <<"\n";
  cout<< "last arrayB" << "\n" << arrayB[1] <<"\n";

  cout<< "last arrayC" << "\n" << arrayC[0] <<"\n";
  cout<< "last arrayC" << "\n" << arrayC[1] <<"\n";
  
  return(0);
}

and a sample run returns these values

initial arrayA
0
initial arrayA
0
initial arrayB
0
initial arrayB
0
initial arrayC
0
initial arrayC
0
mid arrayA
3
mid arrayA
6
mid arrayB
9
mid arrayB
12
mid arrayC
15
mid arrayC
18
last arrayA incorrect value here
12
last arrayA
6
last arrayB and incorrect value here
18
last arrayB
12
last arrayC
15
last arrayC
18


thanks again any help appreciated al.

If you need arrays of length two you need to declare them like

Code:

long double arrayA[2];
long double arrayB[2];
long double arrayC[2];

thank you