Android calculator App crushed -

i have problem in calculator app try call method when app crashing have same method int , double double crashing (is same call)

public void pressequals(view v) {     string[] tar = tvresult.gettext().tostring().split(" ");      string res = " ";     double dres = double.valueof(tar[0])+double.valueof(tar[2]);     int ires = integer.valueof(tar[0])+integer.valueof(tar[2]);     if ( dres == ires)         intcalc(ires, tar);     else         doublecalc(dres, tar); }  public void intcalc(int num, string [] tar) {     int result = num;     string res = " ";     if(tar[1].equals("+"))         res = tar[0] + " + " + tar[2] + " = " + result;     else if(tar[1].equals("-"))         res = tar[0] + " - " + tar[2] + " = " + result;     else if(tar[1].equals("*"))         res = tar[0] + " * " + tar[2] + " = " + result;     else if(tar[1].equals("/"))         res = tar[0] + " / " + tar[2] + " = " + result;     tvresult.settext(res); } public void doublecalc(double num, string [] tar) {     double result = num;     string res = " ";     if(tar[1].equals("+"))         res = tar[0] + " + " + tar[2] + " = " + result;     else if(tar[1].equals("-"))         res = tar[0] + " - " + tar[2] + " = " + result;     else if(tar[1].equals("*"))         res = tar[0] + " * " + tar[2] + " = " + result;     else if(tar[1].equals("/"))         res = tar[0] + " / " + tar[2] + " = " + result;     tvresult.settext(res); }