java - Run-time error on usage of Integer.parseInt() -


i trying solve problem flip 2 input integers , add resultant. obvious way taking modulo , getting each digit , reconstructing back, wanted convert integers string, rendering easy flipped, , reconverting int, adding , returning answer.

code:

import java.util.*;       class testclass {     public static void main(string args[] ) throws exception {     /*      * read input stdin , provide input before running      * use either of these methods input      //bufferedreader     bufferedreader br = new bufferedreader(new      inputstreamreader(system.in));     string line = br.readline();     int n = integer.parseint(line);     */     //scanner     scanner s = new scanner(system.in);     int n = s.nextint();     string num1= " ";     string modnum1= " ";     string num2= " ";     string modnum2= " ";     int s1=0;     int s2=0;     while (n!=0)     {         int x=s.nextint();         int y=s.nextint();         //system.out.println(x+" "+y);         num1=integer.tostring(x);         num2=integer.tostring(y);         (int i=(num1.length()-1); i>=0; i--)         {             modnum1=modnum1 + num1.charat(i);         }         //system.out.println(modnum1);        // (int j=(num1.length()-1); j>=0; j--)         //{           //  modnum2=modnum2 + num2.charat(j);         //}          s1=integer.parseint(modnum1);         system.out.println(s1);         }          n--;     }      //system.out.println("hello world!"); }

this error getting:

exception in thread "main" java.lang.numberformatexception: input string: " 543"     @ java.lang.numberformatexception.forinputstring(numberformatexception.java:65)     @ java.lang.integer.parseint(integer.java:569)     @ java.lang.integer.parseint(integer.java:615)     @ chiller.main(chiller.java:40)

line 40 line i'm using parseint. used .trim() hack too, still doesn't work.

the error cause because java couldn't identify numeric character among character passed integer.parseint() in case passing string start ""+" "+.... there no numeric character java knows " " . using modnum1.trim() may remove unnecessary " " string can full , might work.


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