I just starting learning C++. Here is my code:
#include <iostream>
using namespace std;
int main() {
double hours,rate,pay;
// get the number of hours worked
cout << "How many hours did you work?";
cin>> hours;
//Get the hourly pay rate
cout<<"How much did you get paid per hour?";
cin>> pay;
// calculates the pay
pay = hours * rate;
// Display the pay
cout<<"You have earned $" << pay <<endl;
return 0;
}
I have no idea why this program is outputting the wrong numbers:
How many hours did you work?19
How much did you get paid per hour?15
You have earned $4.03179e-313
Maybe I installed the IDE wrong (I am using Eclipse)?:
I think your cin >> pay line is wrong, because you follow it up with pay = hours * rate. Since rate is never assigned to, it just gets junk data in memory, so the output is undefined. Change cin >> pay to cin >> rate
firstly, initializing variables before using them is a good practice so you shoud try this :
double hours = 0, rate = 0, pay = 0;
secondly, you need to replace pay by rate in :
//Get the hourly pay rate
cout << "How much did you get paid per hour?";
cin >> rate;
Amran AbdelKader.
There are two issues with your code.
Your second cin>> call is initializing pay when it should be initializing rate instead:
cin >> rate;
Or, if you are using C++11 or later, you can use std::get_money() instead:
cin >> get_money(rate);
Your cout<< is outputting a double (a floating-point data type) using its default formatting, which may not be suitable for your needs. To display money values, you should be explicit about the formatting, eg:
cout << "You have earned $" << fixed << setprecision(2) << pay << endl;
Or, if you are using C++11 or later, you can use std::put_money() instead:
cout << "You have earned " << put_money(pay) << endl;
Related
I am new to c++ and I am trying to accomplish my 1st assignment. I don't need a decision but I want to know what am I doing wrong? Here is my code:
#include <iostream>
using namespace std;
int main(){
int chTenders;
int frOrders;
int macCh;
int drinks;
int sauces;
float tip;
float subtotal;
subtotal = chTenders + frOrders + macCh + drinks + sauces + tip;
cout << "How many chicken tenders would you like?\n";
cin >> chTenders;
cout << "How many orders of fries would you like?\n";
cin >> frOrders;
cout << "How many orders of mac and cheese would you like?\n";
cin >> macCh;
cout << "How many drinks would you like?\n";
cin >> drinks;
cout << "How many sauces would you like?\n";
cin >> sauces;
cout << "How much would you like to tip?\n";
cin >> tip;
cout << "====Slim's Order====\n";
cout << "Subtotal $" << subtotal << endl;
return 0;
}
And when I compile and run this it gives me $2.60929e+08 instead of 6.0:
How many chicken tenders would you like?
1
How many orders of fries would you like?
1
How many orders of mac and cheese would you like?
1
How many drinks would you like?
1
How many sauces would you like?
1
How much would you like to tip?
1
====Slim's Order====
Subtotal $2.60929e+08
I think the order of your calculations is just off. subtotal is calculated before you receive input values into the summands (chTenders, frOrders, etc.). Move the subtotal=... line to after the cin << tip statement.
To elaborate on the why, you are computing the value of subtotal before you assign any values to the variables. In C++, until you assign a value to a variable, the result of accessing it is based on what ever happened to be written to that bit of memory by some other process. So you essentially computed a garbage value and then asked the user for input. It is often considered a good practice in C++ to initialize variables at the same time they are defined.
trying to make my first post right so here goes.
I ran into this question and have not been able to figure it out. I keep receiving the error:
error C4700: uninitialized local variable 'miles' used
I have scavenged over all of StackOverflow and keep running into the same answer: I have to initialize my local variable, but when I do that I am creating a set value. I want to set my local variable 'miles' to an unknown value because I want the user to be able to set the value when the program runs.
Everything ran great until I tried to cast the end value 'miles'so that it would truncate.
Please correct me if I'm using incorrect terminology. Fresh-out-of-the-womb-to-programming. And thank you to everyone in advance.
Question:
Write a program that prompts the capacity, in gallons, of an automobile fuel tank and the miles per gallon the automobile can be driven. The program outputs the number of miles the automobile can be driven without refueling. Numbers entered for capacity must allow entry of capacity being an integer and the miles per gallon in decimals. The number of miles must be output to the next lowest integer (without decimals).
#include "stdafx.h"
//include statement
#include<iostream>
//include namespace statement
using namespace std;
//main function
int main()
{
//variable declaration
double capacity_Gallons;
double miles_Gallon;
double miles = static_cast<int>(miles < 0 ? miles - 0.5 : miles + 0.5);
//inputting capacity of automobile
cout << "Enter the capacity of the automobile fuel in gallons: ";
cin >> capacity_Gallons;
cout << endl;
//inputting the miles per Gallons
cout << "Enter the miles per gallons the automobile can be driven: ";
cin >> miles_Gallon;
cout << endl;
//calculating miles
miles = capacity_Gallons * miles_Gallon;
//display output data
cout << "Number of miles driven wihtout refueling: " << miles << endl;
//pause system for some time for user continuation
system("pause");
} //end main
You should take out that line entirely, and change the later line to double miles = capacity_Gallons * miles_Gallon;.
Instead of your handcrafted rounding code it would be better to use the standard rounding function in the display statement, ... << std::lround(miles) << ... although your assignment stipulation says you should round down , not round to nearest as you are currently doing. (So you can just cast to int there).
You don't need to declare miles there, you can declare it at the point it has a value.
#include<iostream>
int main()
{
//inputting capacity of automobile
double capacity_Gallons;
std::cout << "Enter the capacity of the automobile fuel in gallons: ";
std::cin >> capacity_Gallons;
std::cout << endl;
//inputting the miles per Gallons
double miles_Gallon;
std::cout << "Enter the miles per gallons the automobile can be driven: ";
std::cin >> miles_Gallon;
std::cout << endl;
//calculating miles
double miles = capacity_Gallons * miles_Gallon;
//display output data
std::cout << "Number of miles driven wihtout refueling: " << miles << std::endl;
//pause system for some time for user continuation
system("pause");
}
As an aside, using namespace std is a bad habit.
I have coded a program in C++ for an assignment in my C++ Intro class but I have multiple errors in the program but I can't seem to figure out how to get all of the bugs out.
The program is supposed to ask the user for the name of the movie, the number of adult and child tickets sold, and calculate the gross box office profit, net box office profit and the amount paid to the distributor.
I can't seem to figure out how to initialize the variables adultTicketPrice and
childTicketPrice and I thought I declared them and am trying to figure out if they need to get initialized if I already declared them?
And how is the childTicket price out of scope?
And why am I getting the other errors and how can I fix them?
// Michael VanZant
// Flix for Fun Profit Report
#include <iostream>
#include <iomanip>
#include <string>
using namespace std;
int main()
{
// Create all double variables
double adultTicketsSold, childTicketsSold, grossBoxProfit, netBoxProfit,
amtPaidDist, adultTicketPrice, childTicketPrice
adultTicketPrice = 12;
childTicketPrice = 7;
cout << fixed << setprecision(2);
// Create the string variable
string movieName;
// Get the name of the movie and store it in the movieName string
cout << "What is the name of the movie?";
getline(cin, movieName);
cout << "\n";
// Cin.ignore to ignore the string variable type
cin.ignore();
// Get the amount of adult and child tickets sold
cout << "How many adult tickets do you want to buy?";
cin >> adultTicketsSold;
cout << "\n";
cout >> "How many child tickets did you want to buy?";
cin >> childTicketsSold;
cout << "\n";
// Calculate the amount of gross box office profit and display it
grossBoxProfit = (childTicketsSold * childTicketPrice) + (adultTicketsSold * adultTicketPrice);
cout << "Gross Box Office Profit: $" << grossBoxProfit;
cout << "\n";
// Calculate the net box profit amount and display it
netBoxProfit = grossBoxProfit * .20;
cout << "Net Box Profit Amount: $" << netBoxProfit;
cout << "\n";
// Calculate the amount paid to distributor and display it
amtPaidDist = grossBoxProfit - netBoxProfit;
cout << "Amount Paid to Distributor is: $" << amtPaidDist;
return 0;
}
When the compiler says "expected initialiser", it has nothing to do with these lines:
adultTicketPrice = 12;
childTicketPrice = 7;
which are actually assignments, not initialisations (though some old C terminology would call the first assignment an initialisation).
No, it's because it thinks you're still on this line, providing declarations and (optionally) initialisers:
double adultTicketsSold, childTicketsSold, grossBoxProfit, netBoxProfit,
amtPaidDist, adultTicketPrice, childTicketPrice
That's because you didn't put a ; at the end of it.
Also:
cout >> "How many child tickets did you want to buy?";
You meant <<.
Fixing those two little typos, the code compiles.
So I perused some of the other articles, but I can't seem to find a reason to why this won't work. I am new to C++ so be kind please.
// User Pay.cpp : Defines the entry point for the console application.
// This program calculates the user's pay.
#include "stdafx.h"
#include <iostream>
using namespace std;
int main()
{
double hours, rate, pay;
// Get the number of hours worked.
cout << "how many hours did you work? ";
cin >> hours;
// Get the hourly pay rate.
cout << "How much do you get paid per hour? ";
cin >> rate;
//C alculates the Pay.
pay = hours * rate;
// Display the pay.
cout << "You have earned $" << pay << endl;
return 0;
}
You dont need to include #include "stdafx.h".
Also a better practice for the future is not to include the whole std library ("using namespace std"). Instead of this you can call directly std::cout, std::cin etc...
Also a system("PAUSE") call at the end of the code before "return 0" would be helpful (in your example). So the console doesn't close when the program execute and you can see your result.
Code example:
#include <iostream>
//using namespace std;
int main()
{
double hours, rate, pay;
// Get the number of hours worked.
std::cout << "how many hours did you work? ";
std::cin >> hours;
// Get the hourly pay rate.
std::cout << "How much do you get paid per hour? ";
std::cin >> rate;
//C alculates the Pay.
pay = hours * rate;
// Display the pay.
std::cout << "You have earned $" << pay << std::endl;
system("PAUSE");
return 0;
}
Try creating an empty project (uncheck precompiled headers). then copy your code but delete #include "stdafx.h".
It looks as if you had an error, and then added:
`using namespace std;`
There should be no error now.
I'm a beginner programmer, so this is going to look messy, but I keep getting the problem that is mentioned in the title. No matter where I try to put endl; it keeps giving me the same error. Also when I run the code my total for the second store comes out right but the first store total does not. Any idea on how to fix this? I'm using codeblocks on a windows 7 computer.
#include <iostream> //Allows cout/cin
#include <ctime> //Allows time
#include <iomanip> //Allows setprecision
using namespace std;
int main()
{
//Include header
//Input variables
double widgetStores;
double numberSoldFirst1;
double numberSoldFirst2;
double numberSoldSecond1;
double numberSoldSecond2;
double widgetsLeftS1W2;
double widgetsLeftS2W1;
double widgetsLeftS2W2;
//Start Clock
clock_t begin, end;
double time_spent;
begin = clock();
//Prompt for total number in stores
cout << "Total number of widgets at each store starting with :";
cin >> widgetStores;
double widgetStore1=widgetStores;
double widgetStore2=widgetStores;
double widgetsLeftS1W1;
//Prompt for amount sold during first and second week
cout << "How many widgets were sold at Store 1 the first week? ";
cin >> numberSoldFirst1;
cout << "How many widgets were sold at Store 1 the 2nd week? ";
cin >> numberSoldSecond1;
cout << "How many widgets were sold at Store 2 the first week? ";
cin >> numberSoldFirst2;
cout << "How many widgets were sold at Store 2 the 2nd week? ";
cin >> numberSoldSecond2;
//Calculate Number of widgets
widgetsLeftS1W1-=(widgetStore1-numberSoldFirst1);
widgetsLeftS1W2-=(numberSoldFirst1-numberSoldSecond1);
widgetsLeftS2W1-=(widgetStore2-numberSoldFirst2);
widgetsLeftS2W2-=(numberSoldFirst2-numberSoldSecond2);
//Display Values
cout << "Store 1 has " << widgetsLeftS1W2 << " widgets left after the 2nd week.";
cout << "Store 2 has " <<widgetsLeftS2W2 << " widgets left after the 2nd week.";
//Show time elapsed
end = clock();
time_spent = (double)(end - begin) / CLOCKS_PER_SEC;
cout << setprecision(2) << fixed << "****Elapsed time:" <<time_spent/60 << "minutes****";
return 0;
Did you try something like
cout << "Total number of widgets at each store starting with :";
cin >> widgetStores;
cout << endl; //Added this
cin doesn't have a << operator, so you need to send it to cout.
Edit: I found the error you're having. I guess that you are trying to put in lines as literally
endl;
and that doesn't go anywhere...
The only compile error this program has, is that you're using widgetsLeftS1W1, widgetsLeftS1W2, widgetsLeftS2W1 and widgetsLeftS2W2 before initializing them.
You probably need = instead of -=.
When you say
widgetsLeftS1W1 -= (widgetStore1-numberSoldFirst1);
what you actually mean is
widgetsLeftS1W1 = widgetsLeftS1W1 - (widgetStore1-numberSoldFirst1);
The computer doesn't know the value of widgetsLeftS1W1, so it gives you the error.
Conclusion: use
widgetsLeftS1W1 = (widgetStore1 - numberSoldFirst1);
Try initializing the values of
widgetsLeftS1W1
widgetsLeftS1W2
widgetsLeftS2W1
widgetsLeftS2W2
with zero while declaring them at the top.