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Answer: same as previous is double. double - double hex - first 32 bit as dword. 10 = 4024000000000000 1076101120 2978 = 40a7440000000000 1084703744 3056 = 40a7e00000000000 1084743680 3234 = 40a9440000000000 1084834816 3254 = 40a96c0000000000 1084845056 3289 = 40a9b20000000000 1084862976 3299 = 40a9c60000000000 1084868096 3309 = 40a9da0000000000 1084873216 3334 = 40aa0c0000000000 1084886016 3354 = 40aa340000000000 1084896256 7458 = 40bd220000000000 1086136832 7468 = 40bd2c0000000000 1086139392 7478 = 40bd360000000000 1086141952 15492 = 40ce420000000000 1087259136 15570 = 40ce690000000000 1087269120 Code for http://www.tutorialspoint.com/compile_java_online.php public class HelloWorld{ public static void main(String []args){ int[] arr = new int[] {10,2978,3056,3234,3254,3289,3299,3309,3334,3354,7458,7468,7478,15492,15570}; for (int j: arr) { long l = Double.doubleToLongBits((double)j); System.out.println(j + " = " + Long.toHexString(l) + " " + ((int)(l >> 32))); } } } For your new data: 1 = 3ff0000000000000 1072693248 2 = 4000000000000000 1073741824 3 = 4008000000000000 1074266112 4 = 4010000000000000 1074790400 5 = 4014000000000000 1075052544 6 = 4018000000000000 1075314688 7 = 401c000000000000 1075576832 8 = 4020000000000000 1075838976 9 = 4022000000000000 1075970048 10 = 4024000000000000 1076101120 11 = 4026000000000000 1076232192 12 = 4028000000000000 1076363264 13 = 402a000000000000 1076494336 14 = 402c000000000000 1076625408 15 = 402e000000000000 1076756480 16 = 4030000000000000 1076887552 17 = 4031000000000000 1076953088 18 = 4032000000000000 1077018624 19 = 4033000000000000 1077084160 20 = 4034000000000000 1077149696 21 = 4035000000000000 1077215232 22 = 4036000000000000 1077280768 23 = 4037000000000000 1077346304