java - Math done in a 10x10 two dimensional array does not compute correctly -

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i set 2 dimensional array, 10 10, , each slot (x*y) respective position. i'm trying add numbers in columns 3, 5, , 7 ctotal , add numbers in rows 2, 4, , 6 rtotal. coding seems sound can't seem make work. ideas?

public static void arraymath() {     int ctotal = 0;     int rtotal = 0;     //int tdiffvalue = (rtotal - ctotal);      int twodimarr[][] = new int[10][10];      int row = 10;      int col = 10;     int x = 0;     int y = 0;      for(x = 0; x < row; x++)     {         for(y = 0; y < col; y++)         {             twodimarr[x][y] = x*y;         }     }      for(x = 0; x < row; x++)         {         for(y = 0; y < col; y++)             {             if( (x+y) < col )             {         //system.out.print( " " );         }     //system.out.print(" " + (twodimarr[x][y]));     }     //system.out.println();     }      for(x = 0; x < twodimarr.length; x++)     //problems start down here.       {         for( y= 0; y<twodimarr.length; y++)         {             if(y == 2 || y == 4 || y == 6)             {             rtotal = ((rtotal + twodimarr[x][y]));             }         }       }       system.out.println("rtotal " + rtotal + ".");        for(x = 0; x < twodimarr.length; x++)       {           for(y = 0; y < twodimarr.length; y++)           {               if(x == 3 || x == 5 || x == 7)              {              ctotal = ((ctotal + twodimarr[x][y]));              }           }       }       system.out.print("ctotal " + ctotal + ".");   }

x==3 isn't third column, it's 4th(0,1,2,3). meaning it's column of 3*0, 3*1, etc. , 675/540 numbers correct in case.


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