Write a method that takes three numerical String values and sums their values.

For example, the call sumStrings("1", "5", "7") would return 13.

This is in Java.

Algorithm:

Explanation:

// Java program to calculate sum of all numbers present  

// in a string containing alphanumeric characters  

class GFG  

{  

   // Function to calculate sum of all numbers present  

   // in a string containing alphanumeric characters  

   static int findSum(String str)  

   {  

       // A temporary string  

       String temp = "";  

       // holds sum of all numbers present in the string  

       int sum = 0;  

       // read each character in input string  

       for(int i = 0; i < str.length(); i++)  

       {  

           char ch = str.charAt(i);  

           // if current character is a digit  

           if (Character.isDigit(ch))  

               temp += ch;  

           // if current character is an alphabet  

           else

           {  

               // increment sum by number found earlier  

               // (if any)  

               sum += Integer.parseInt(temp);  

               // reset temporary string to empty  

               temp = "0";  

           }  

       }  

       // atoi(temp.c_str()) takes care of trailing  

       // numbers  

       return sum + Integer.parseInt(temp);  

   }    

   // Driver code  

   public static void main (String[] args)  

   {      

       // input alphanumeric string  

       String str = "1abc5yz7";  

       System.out.println(findSum(str));  

   }  

}  

Is in the provided screenshot!

Explanation:

All we need to do is use the built in function "parseInt" to turn a String into an Integer, then we can just add these and return it from the function!

I've also added some basic exception handling - if any one of the numbers aren't written in correctly then the program will just return '-1' instead of crashing.

one method is to click on the icon.