using System.Text;
private string AddNumber(string numA, string numB) { int lenA=0, lenB=0; int lenI=0, intTen=0; int intA=0, intB=0; StringBuilder result=new StringBuilder(""); lenA=numA.Length; lenB=numB.Length; if(lenA>lenB) lenI=lenA; else lenI=lenB; for(int i=0; i<lenI; i++) { if(i<lenA) intA=Convert.ToInt16(numA.Substring(lenA-i-1,1)); else intA=0; if(i<lenB) intB=Convert.ToInt16(numB.Substring(lenB-i-1,1)); else intB=0; int temp=intA+intB+intTen; result.Insert(0,Convert.ToString((int)temp%10)); intTen=(int)temp /10; } if(intTen>0) result.Insert(0,Convert.ToString(intTen)); return result.ToString(); }
private string MultiNum(string NumA, string NumB) { int lenA=0, lenB=0; int lenI=0;
string result="0"; string AddResult="0"; int Dig=0;
lenA=NumA.Length; lenB=NumB.Length; if(lenA>lenB) { lenI=lenB; for(int i=0; i<lenI; i++) { AddResult="0"; Dig=Convert.ToInt16(NumB.Substring(lenB-i-1,1)); for(int j=0; j<Dig; j++) AddResult=AddNumber(NumA,AddResult); for(int k=0; k<i; k++) AddResult=AddResult + "0"; result=AddNumber(AddResult,result); } } else { lenI=lenA; for(int i=0; i<lenI; i++) { AddResult="0"; Dig=Convert.ToInt16(NumA.Substring(lenA-i-1,1)); for(int j=0; j<Dig; j++) AddResult=AddNumber(NumB,AddResult); for(int k=0; k<i; k++) AddResult=AddResult + "0"; result=AddNumber(AddResult,result); } } return result; }
private void button2_Click(object sender, System.EventArgs e) { DateTime dtm1=DateTime.Now; Console.WriteLine(AddNumber("1225225236523456889","1255625622452552")); Console.WriteLine(dtm1.Millisecond + " " + DateTime.Now.Millisecond ); }
private void button3_Click(object sender, System.EventArgs e) { DateTime dtm1=DateTime.Now; string test="1"; test=MultiNum("453123123156341231651231563121563151213513422","1254564231541321541385435453453124563131541534313543"); Console.WriteLine(test); Console.WriteLine(dtm1.Millisecond + " " + DateTime.Now.Millisecond ); } 
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