Skripta za kalkulator

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Evo, muči me još jedno pitanje - naime pronašao sam na internetu skriptu za kalkulator. Zanima me šta je sve ovde netačno? (Mislim da ima negde oko dvadesetak grešci), i kako to da ispravim?

//Calculator Script //Ameobea //December 2010 #include <iostream> #include <string> //Functions that perform the basic mathematical functions.  They require two double-type numbers to preform the operations on.  double add(double first, double second) {    double temp=first+second;    return(temp); } double subtract(double first, double second) {    double temp=first-second;    return(temp); } double divide(double first, double second) {    double temp=first/second;    return(temp); } double multiply(double first, double second) {    double temp=first*second;    return(temp); } //This function is used if no operation sign is found in the input string.  It will simply display the number inputted.  double do_nothing(double first) {    double temp=first;    return(temp); } //gets the location of the operator in the string for use in the proactive debugger in the function get_second_number.  get_operator_location(string input_string_a) {    if(input_string.find("+")>0) {       return(input_string.find("+")+1);    }    else if(input_string.find("-")>0) {       return(input_string.find("-")+1);    }    else if(input_string.find("*")>0) {       return(input_string.find("*")+1);    }    else if(input_string.find("/")>0) {       return(input_string.find("/")+1);    } } //Returns the literal char of what the operator is to be used to determine the function that needs to be used.  char get_operator(string input_string) {    if(input_string.find("+")>0) {       return("+");    }    else if(input_string.find("-")>0) {       return("-");    }    else if(input_string.find("*")>0) {       return("*");    }    else if(input_string.find("/")>0) {       return("/");    }    else    {       //possible problem here       return("=");    }     } //preforms a loop to find the first number before the operator.  //It breaks the loop when it hits the operator.  It returns a string of the first number.  string get_first_number_string(string input_string) {    string temp;    for (int x=0;input_string[x]==get_operator(input_string);x++) {       temp.append(input_string[x]);    }    return(temp);    } } //does the same as the previous one, except it starts at the character after the operator and works to the end of the string.  string get_second_number(string input_string) {    string temp;    if(get_operator(input_string)!="="&&get_operator_location(input_string)!=input_string.size()) {       for (int x=input_string.find(get_operator(input_string))+2;X>input_string.length();x++) {          temp.append(input_string[x]);       }    }    else {    return(0);    } } //these two below functions transfer the string //output of the first and second numbers from get_first_number and //get_second_number into the double format to be evaluated later.  double transfer_first_number(string input_string) {    double result;    istringstream convert(input_string);    convert>>result;    return(result); } //see above ^ double transfer_second_number(string input_string) {    double result;    istringstream convert(input_string);    convert>>result;    return(result); } int main() { //defines the string that holds the value of the input string formula_string; //welcome message cout<<"Calculator\nCasey Primozic\nEnter a formula for the calculator to evaluate and press enter.  \n"; cout<<"Enter the word QUIT at any time to terminate the program.  /n/n"; cout<<"Note:  Entering letters or incorrectly formatted strings into the calculator may cause undesired output or crash the program.  \n"; cout<<"See the included readme.txt file for directions on the use of the calculator.  \n\n";    //gets the input string    cin>>formula_string;    //loop that checks for the exit string    while (continue!="QUIT") {       //checks to see if the first digit of the string is a digit, minimal in-code debugger       if (formula_string[0]>='0' && formula_string[0]<='9') {          //display error and ask for new input          cout<<"\nError:  Bad input.  Enter another formula to evaluate.  \n\n";          break;       }       //Here's where the action happens.        else {          //variables used to calculate the answer.           double answer;                    //these take the answers from get_first_number and get_second_number and                         //transfer them into the double format using transfer_first_number and transfer_second_number.           double var_first=transfer_first_number(get_first_number(formula_string));          double var_second=transfer_first_number(get_second_number(formula_string));                    //Calls the functions that preforms the appropriate operation                         //depending on the value of the operator attained by get_operator.           //They set the variable answer equal to the appropriate value.           switch(get_operator(formula_string) {             case "+":                answer=add(var_first, var_second);                break;             case "-":                answer=subtract(var_first, var_second);                break;             case "*":                answer=multiply(var_first, var_second);                break;             case "/":                answer=divide(var_first, var_second);                break;             case "=":                answer=do_nothing(var_first);                break;          }       }              //prints the answer       cout<<answer<<"\n";    } return(1); }

• 2Ovo se svidja korisnicima: ThePhilosopher, E.L.I.T.E.
  
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Nisam probao kod, ali mi na prvi pogled izgleda da ti ispod linije #include <string> nedostaje using namespace std;

Kad budeš malo savladao te osnove, baci pogled na malo drugačiji digitron:
Prvi deo: [Link mogu videti samo ulogovani korisnici]
Drugi deo: [Link mogu videti samo ulogovani korisnici]
Treći deo: [Link mogu videti samo ulogovani korisnici]