Calculate Sum Of Integers Mentioned In String

Mar 3, 2015

So this I need to write a program which asks the user to enter any string, but the string has to have integers inside. I need to calculate the sum of those integers mentioned in the String. Also return 0 if there aren't any.

User input: I have a 91
Output: 10

I cant seem to find a way scan through the string to find the integers and add them.

String x1=input.next();
char digit= x1.charAt(3);}
public static int findDigitSum (String x)?

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So I wrote a method that simply calculates the sum of all integers between 1 and a given integer n. The method works fine however, as n gets big the solution will have time and space problems. Some I'm just curious if there is a better method than my iterative one that would produce a better Big O value.

public static int sum(int n)
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int total = 0;
for (int i = 1; i <=n; i++)
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static String [][] students = new String [14][4];
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[Code] .....

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double a = scan.nextInt();
double b = scan.nextInt();
double c = scan.nextInt();

//**********************************Equations**********************************
System.out.println ();

double sum = a + b + c;
System.out.printf("Sum = %d", sum);

Heres the error I'm getting

Enter three positive integers separated by spaces, then press enter:
15 20 9

Sum = Exception in thread "main" java.util.IllegalFormatConversionException: d != java.lang.Double
at java.util.Formatter$FormatSpecifier.failConversion(Unknown Source)
at java.util.Formatter$FormatSpecifier.printInteger(Unknown Source)
at java.util.Formatter$FormatSpecifier.print(Unknown Source)
at java.util.Formatter.format(Unknown Source)
at java.io.PrintStream.format(Unknown Source)
at java.io.PrintStream.printf(Unknown Source)
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import java.util.Arrays;
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[Code] ....

It Prints [firstname,secondname,thirdname,fourthname]

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import java.util.Scanner;

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Competitor 2: 22222
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Competitor 3: 33333
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Competitor 4: 44444
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Competitor 5: 55555
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