atoi() function in c# .net - convert string to integer

 

public static int atoi(string str)
{
int sign=1;
int TheNumber=0;
int tmp=0;
int x=0;
int l=(str.Length)-1;
char[] c=str.ToCharArray();

if ('-'==c[0]){sign=-1; x=1;}

 for(;x < l;x++)
  {
     if ((c[x]>='0')&&(c[x]<='9'))
	{
	tmp=(c[x]-'0');//0 is the 0 index
	TheNumber=TheNumber*10+tmp; //to enlarge the number by *10 every time
	}
  }

return TheNumber*sign;

}

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