Java giving wrong result -

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i have method in java program here giving wrong result on simple multiplication , not sure what's going on. maybe it's setting in eclipse need expand -- have no idea.

simple this: 987,654,321 * 10. should 9,876,543,210. instead getting 1,286,608,618. in world? method reading in characters , adding tokenized number (not longer 10 digits) list. else works fine hates number reason.

public void number(char dig, boolean lc){     int num = character.getnumericvalue(dig);     if(number == 0){         number = num;     }     else{                    number = number*10 + num;     }     if(lc){         if(string.valueof(number).trim().length() <= intlength){             tokenlist.add(number);             number = 0;             return;         }         else{         system.out.println("error in number entry. invalid or exceeded length: " + number);              number = 0;              return;             }        } }

your value far outside range of integer. following statement:

system.out.println(9_876_543_210l);  // claiming should have come system.out.println(integer.max_value);

prints:

9876543210 2147483647

so, when 987654321 * 10, value can't fit int, , overflows, , result.

alternative? use long type.

see also:


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