# Write a function that reads a string of digits, possibly preceded by + or -, and converts this string to the integer value it represents.

Write a function that reads a string of digits, possibly preceded by + or -, and converts this string to the integer value it represents. Be sure that your function checksthat the string is well formed, that is, that it represents a valid integer. (Hint: use the functions provided in and ). Also, write a driver programs to test the function.

any help would be highly appreciate. June 16, 2011 at 4:22 PM

```import java.util.*;
public class Driver {

public static void main(String[] args) {
Scanner input=new Scanner(System.in);
int num1=0;
int num2=0;
char operator=' ';
int result=0;

System.out.println("Enter expressions such as  17 + 3 or 3.14159 * 4.7");
System.out.println("Use any of the operators +, -, *, /.");

System.out.println();
while (true){
System.out.print("Enter Expression: ");
String str=input.nextLine();
String st[]=str.split(" ");
if((st.matches("((-|\\+)?[0-9]+(\\.[0-9]+)?)+"))&&((st.charAt(0)=='+')||(st.charAt(0)=='-')||(st.charAt(0)=='*')||(st.charAt(0)=='/'))&&(st.matches("((-|\\+)?[0-9]+(\\.[0-9]+)?)+"))){
num1=Integer.parseInt(st);
operator = st.charAt(0);
num2=Integer.parseInt(st);
switch (operator) {

case '+':
result = num1 + num2;
break;
case '-':
result = num1 - num2;
break;
case '*':
result = num1 * num2;
break;
case '/':
result = num1 / num2;
break;
default:
System.out.println("Unknown operator: " + operator);
}
System.out.println("Result is " + result);
}
else{
System.out.println("Invalid Expression!");
break;
}
}

}
}
``` June 16, 2011 at 5:18 PM

i think here we are not handling Array dynamically, suppose if we given 200+100 , then its trowing array index out of range error,so could you pls help me in this...

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