C++ :: Using Char To Check Whether The User Inputs The Right Command?
Mar 20, 2014
I've been trying to finish this airplane seating program I've been working on for a month or two. The problem I have right now is that if the user inputs a number when prompted to enter the column letter he wants, the program goes on to the next step as if the prompt had been answered correctly.
So I originally used string but I heard from Daleth that Char was better, but I don't know how to apply it. I figured out cin.fail, but I've yet to finish this part.
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Oct 26, 2013
Any chances for a c program to check for browser inputs?
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Jan 11, 2015
How can i set up an error check so only letters are entered? I know how to do it for numbers but how to make it so it only allows a-z inputs.
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Apr 9, 2014
I want to have calculations take place inside a switch statement that calls the appropriate function. The menu portion of the program works well, but I can't figure out how to let the user actually input 2 different numbers to the functions. My questions are:
1. If I use scanf to assign values to the variables, what determines end of input to each variable? (ie.. scanf("%d%d", &a, &b) what is the end of a, what is the end of b?)
2. Should I assign the variables to user input inside the switch, or try to do it in the functions below?
3. Is there something I haven't thought to ask that will screw me over? I'm really new to this.
Code:
#include<stdio.h>
int add(int b, int a);
int mult(int b, int a);
main() {
[Code] ....
This really was a test of multilayer menu, but I want to add functionality if I can.
Changed a variable before posting and didn't change all the conditions testing it.
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Sep 27, 2013
On my program I use a counter to count to 10, then i ask for a string, in this case "yes" or "no", during the count, i want to keep the user from putting inputs in, due to the fact that if they put both "yes" and "no" before the program reads the string.
Code:
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include <stdbool.h>
#include <time.h>
#include <string.h>
}
[code]....
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Jul 23, 2014
I have a project that requires I take user input from menu options and put it into an array which I will average out. I can set the menu up I think, but I cannot understand how to put what the user inputs into an array. Granted I just took the lecture on arrays today. Also we can only use functions to do the work.
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Mar 16, 2014
How to get user inputs into an array. I have to get 10 user inputs into the array and I'm trying to use a loop but once I run it it crashes whenever you input the first value. This is my absolute first time working with arrays and I've been trying to do research
#include <stdio.h>
#define SIZE 10
void Input(const int array1[]);
void Calculations(int array1[], int average);
void Output(int array1[], int average);
[Code]....
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Jul 31, 2013
I have recently looked into a self created project where I wanted to compare user input against a list of strings in an external file. That has since been completed to my great satisfaction, however it did throw up some interesting issues in my knowledge and understanding of user input..What is the best way to pick up user input i.e scanf,stdin etc. and when should either be used and can a mixture of types be used, and if so, when and why.
A quick program to take different input methods and display differnt output method (obviously corresponding i.e scanf/printf - fgets/fputs)
My first pothole came when I have setup the method for scanf - fine. Then I setup the method for fgets(test,100,stdin) for example and the fgets method no longer picks up stdin from the user..
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Mar 17, 2014
How to calculate the values between numbers that a user types in.
Write a function which takes two parameter of integer type and both parameters are positive integer. These number should be provided by the user of your program. The first parameter is lower than the second parameter. You function should be able to calculate the sum of the square of each of the numbers between the two inputs and should display that. Please write a main function to display the working of your function. Call the function at least three times by using some loop in the main function.
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Sep 8, 2014
#include <iostream>
using namespace std;
void insert(int data, int positionOf_n);
void print();
struct node {
int data;
struct node *next;
[code]....
this is the original code which use the insert function call in the main as predefined that doesn't allow the user to input the value that they want
#include <iostream>
using namespace std;
void insert(int data, int positionOf_n);
void print();
struct node {
int data;
[code]....
and this the code which i tried to replace the limitation of the above code by using two for loops in the main function instead of the <insert(5,2)> from the above code which allow the user to insert it own values to the linked list, but it keeps crashing.
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Apr 5, 2013
How can I stomp the arr size of 50 with the value the user inputs? The function doesn't sum up the even integers from 0 to the value the user inputs. Instead it sums up exactly that many even integers.
Is there a way I can stomp the size of the array with what the user inputs so that the sum calculation never goes past the value the user inputs?
Code:
void sumIntegers () {
int arr[50];
int i = 0;
int num = 0;
int sum = 0;
printf("
I want to sum up even integers <= 50.
[Code] .....
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Aug 2, 2013
Write a program that computes a running sum of inputs from the user, terminating when the user gives an input value of 0
Using a while loop - no problem. Its only when I try to code it with a for loop that the program doesn't terminate with a 0 input. It terminates with a -1 input!!
while loop
#include <iostream>
using namespace std;
int main() {
float input=1;
float sum = 0;
[Code] ....
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Aug 26, 2013
I'm trying to make a fibonacci sequence with some user inputs. I'm using arrays for this, the user inputs are for the Nth term and the starting number (as in the number in front of 0).
My problem is that when the program runs it's an infinite loop which constantly prints the starting number. Which, I think, means that my WHILE loop isn't coming to an end and my 'count' variable isn't increasing.
#include <iostream>
using namespace std;
int main() {
int start;
int term;
cout << "Input a starting number for the sequence: ";
cin >> start;
cout << "
Enter the Nth term for the sequence to reach: ";
[code].....
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Nov 12, 2013
This code is from my text book it shows how to implement code that is embedded I have modified it somewhat but I was wondering how I could get the user to implement the size of the array and enter the integers with the size of array that was implemented.
#include<iostream>
#include<cstdlib>
#include<iomanip>
using namespace std;
[Code].....
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Sep 10, 2013
I want to program a program that produces a random number between 1-10, then if the number is correct, says like HEY GOOD JOB and if its not says try AGAIN! also, at any point the user can quit by typing in X.
I know that I can use stuff like cout << "Hey put in a guess now" to prompt the user but I dont know how to accept inputs.
For example, how do I use scanf to do this?
I know that if I use scanf, it takes in a value, but where the heck does it store it?
eg. scanf(%s,guess);
Is that valid? I get an invalid expression error when trying to use that in C++.
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Jan 11, 2015
I am fairly new to C++ and I am trying to write a code that determines whether a number which the user inputs is prime or not. I have the code, but when I run it all it actually does is report odd numbers as prime and even numbers as not prime.
#include <iostream>
using namespace std;
//declaring variables//
int i;
int num;
[Code] ....
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Feb 17, 2013
I want to create a grading program that the user inputs a name and then on that value (name) there is a vector of doubles to represent his/her mark and then calculates an average how would I go about doing this?
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Aug 2, 2014
#include <iostream>
#include <iomanip>
#include <fstream>
[Code]....
i have already tried putting system pause or cin.get after it, but no luck
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Nov 2, 2013
Code:
#include<stdio.h>
void main
{
int i;
int marks[10];
}
[code]....
how to give error and ask user to re enter if user enter other then a number?
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Feb 27, 2014
For example, to calculate GPA, we add all the grade point of a course and divide by the number of courses we are taking. How do I create a program in such a way that when the user enters grade point for two courses, it will add the grade points for the two course and divide by 2. And if another user enters grade points for six courses, it adds the grade points and divides by 6.
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Jan 11, 2014
I have created an error message if the user inputs the wrong selection number
if (choices < 1 || choices > 5)
{
cout << "
Please Enter a number between 1-5
";
}
How would i create a error message if the user inputs letters/words instead of a number.
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Sep 16, 2014
int get_command_line (char * sa) {
char * s;
char * l = fgets(s, 300*5, stdin);
int i = 0;
int j;
int n;
[Code] ....
The aim is to have the function return the number of arguments made after assigning each of the arguments to a c string stored in an array of five pointers. This is how I declare this:
int main(void)
int n;
char s0[300];
char s1[300];
char s2[300];
char s3[300];
[Code] ....
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Jan 28, 2015
Code:
#include<stdio.h>
#include<stdlib.h>
#include<ctype.h>
#include<string.h>
int main(void) {
int i;
char *str;
int len = 1;
[Code]...
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Aug 31, 2014
I had problem in comparing 2 char vairable in check function
if(room_no==r)
variable r take input from user and compare to room_no read from file.
#include<iostream>
#include<conio.h>
#include<fstream>
#include<stdio.h>
#include<dos.h>
#include<string>
#include<stdlib.h>
[Code] .....
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Aug 15, 2013
I want to be able to write a program where I can record user input but combine it with command line arguments. For example I do a simple getline(); and the user types test how to combine it so it could be like test /q and it gives a different output depending on what additional input was added. Can this be done with lots of different inputs?
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Feb 10, 2013
How can you tell what button(yes/no) on a message box is clicked? Below is what I have right now but I am getting errors.
if (MessageBox(NULL,"The Message", "The Title", MB_YESNO) == IDYES){
do something
}
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