[Solved]Java Creating Program Supposed Able Solve Basic Addition Multiplication Subtraction Wonder Q37229054
JAVA ONLY
I am creating a program that is supposed to be able to solvebasic addition, multiplication, and subtraction. I am wondering whynothing shows up in my console and why I am getting errors. Can youhelp?
/**
* Rules: if it is a whole number, you must have a .0 afterit.
* for example, if I want to do 2-3=0, I must do 2.0-3.0=0.0.Another rule is that there must be spaces BEFORE and AFTER eachnumber
*/
public class Main {
public staticvoid main(String[] args) {
//variables I will need
String welcome=”Welcome to the Algebraic Calculator nWrite yourequation or problem here:”;
//variables for if it is just answers
String finalanswer = “”;
//run it, this is the main runner
System.out.println(welcome);
Scanner input = newScanner(System.in);
String UserInput= input.nextLine();
finalanswer=””+solve(UserInput);
System.out.println(finalanswer);
}
}
public staticdouble solve(String answer) {
double solve= firstnum(0,answer);
for (int i=1;i
if (answer.substring(i-1,i)==”+”) {
solve+=secondnum(i,answer);
}
if (answer.substring(i-1,i)==”*”) {
solve*=secondnum(i,answer);
}
if (answer.substring(i-1,i)==”/”) {
solve/=secondnum(i,answer);
}
if (answer.substring(i-1,i)==”-“) {
solve-=secondnum(i,answer);
}
}
return solve;
}
public staticdouble firstnum(int loc,StringInput) {
String bob=””;
//if((Input.substring(loc-2,loc-1)==” “)) {
// return Double.parseDouble(bob);
//}
while (Input.substring(loc+1,loc+2)!=” “) {
if((Input.substring(loc+1,loc+2)==”1″)||(Input.substring(loc+1,loc+2)==”2″)||(Input.substring(loc+1,loc+2)==”3″)
||(Input.substring(loc+1,loc+2)==”4″)||(Input.substring(loc+1,loc+2)==”5″)||(Input.substring(loc+1,loc+2)==”6″)
||(Input.substring(loc+1,loc+2)==”7″)||(Input.substring(loc+1,loc+2)==”8″)||(Input.substring(loc+1,loc+2)==”9″)
||(Input.substring(loc+1,loc+2)==”0″)||(Input.substring(loc+1,loc+2)==”.”)){
bob+=Input.substring(loc+1,loc+2);
loc++;
}
}
return Double.parseDouble(bob);
}
//this is a method that is meant to get the number that isbehind the +, *, -, or / symbol
//it takes in the location of the +, *, -, or / symbol and thestring and then returns the
//double that is behind the +, *, -, or / symbol as a double
public staticdouble secondnum(int loc,StringInput) {
String bob=””;
while (Input.substring(loc+1,loc+2)!=” “) {
if((Input.substring(loc+1,loc+2)==”1″)||(Input.substring(loc+1,loc+2)==”2″)||(Input.substring(loc+1,loc+2)==”3″)
||(Input.substring(loc+1,loc+2)==”4″)||(Input.substring(loc+1,loc+2)==”5″)||(Input.substring(loc+1,loc+2)==”6″)
||(Input.substring(loc+1,loc+2)==”7″)||(Input.substring(loc+1,loc+2)==”8″)||(Input.substring(loc+1,loc+2)==”9″)
||(Input.substring(loc+1,loc+2)==”0″)||(Input.substring(loc+1,loc+2)==”.”)){
bob+=Input.substring(loc+1,loc+2);
loc++;
}
}
return Double.parseDouble(bob);
}
}
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