Question

Given a string like the following one in Java "123+45+678", how can I pull out the characters that make up the separate integers and add them together. I'm not allowed to use parseInt().

So for this one I would need to add 123 + 45 + 678 to get the total(846)

Answer 1

Program:

public class Main
{
        public static int convertStr(String str)  
    {  
      
        // Initializing a variable  
        int num = 0;  
        // Returns length of the given string
        int len = str.length();  
      
        // Iterate till length of the string  
        for(int x = 0; x < len; x++)  
            // Subtract 48 from the current digit  
            // Converting string to number
            num = num * 10 + ((int)str.charAt(x) - 48);  
        // Returns number
        return num; 
    }
        
        public static void main(String[] args) {
                String givenStr = "123+45+678";
                // Splitting the given string based on +
                String[] splittedStr = givenStr.split("\\+");
                // Converting the strings to intergers and adding them
                int total = convertStr(splittedStr[0]) + convertStr(splittedStr[1]) + convertStr(splittedStr[2]);
                // Printing the output as total
                System.out.println("Total: "+splittedStr[0]+" + "+splittedStr[1]+" + "+splittedStr[2]+" = "+total);
        }
}

Output: