C++ :: How To Check If Input Is Integer

Jan 15, 2013

I have an assignment to do..i have done it..but i need to do one more thing. Things sound like this: user inputs 6 integers program needs to check them if there are integer if not it has to output a message for the user if the input is integer it has to go further and work with the input. I have used this structure :

if ( ! ( cin >> temp ) ) {
cout<<"Input is not integer.This program will end ! "<<endl<<endl<<endl;
system("pause");
return 0;
}

Where I declared temp as being int since i started, the problem is after it gets the last input still waits for an input i will attach the source code if needed.

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C :: Check If Input Is Integer Using Only Loops?

Nov 3, 2013

I have a homework that needs to verify if the input of the user is an integer using only loops no if statements Here's the problem:

A program is required that prompts the user for a number. The program will then print a series of asterisks to represent the number. If the user enters a number less than 1, the program stops. For example:

Enter a number: 5
*****
Enter a number: 3
***
Enter a number: 9
*********
Enter a number: 0

All user input must be validated:
- Check for non-numeric input when reading numeric input
- Check that values entered are within the expected range for their purpose, or in range based on the requirements statement

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Visual C++ :: Check If Input Is Integer Or Not

Jun 20, 2014

I have been trying to make a very simply programme that checks if the inputted information is an integer or not (i.e: that it contains no other characters).

I have tried using the isdigit function (but this only works for single characters). I have tried cin.clear, cin.ignore (1000) but this doesn't work either..

Any effective way to check if x in the following programme has been entered correctly

#include <iostream>
using namespace std;
int main() {
cout << "Please enter an integer (positive or negative)" << endl;
int x;
cin >> x;
HERE I WOULD LIKE CODE TO CHECK IF THE USERS INPUT IS VALID
}

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C :: Check Same Integer In Row And Column In Matrix

Jan 8, 2015

I am new in c programming and my teacher gives me home word to do. the home work is to create dynamic matrix that check if i have same number in row or in column. for example the matrix

1 2 3
2 3 1
3 1 2

is legal matrix and this matrix is illegal

1 3 3
2 1 3
3 2 1

I created the matrix and sent it to function but there I don't know how build the code.

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C :: Displaying Integer Check Sum In Text Outfile

Jul 30, 2013

How to get a txt Outfile to display a Checksum.

Code:

ChecksumFileDisplay = fopen(ChecksumFileDisplayPath, "r");
fprintf(ChecksumFileDisplay, BigEndianChecksum);

That's what I have but it doesn't like the fprintf function because BigEndianChecksum is an unsigned int and it wants a pointer to a const char. Is there a function similar to this that will display an 8 digit integer in a txt outfile?

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C :: Check Whether Input Is A Character Or Not

Apr 27, 2013

Code:
char value;
printf_s("enter:");
if (scanf_s("%c", &value) != 1)
{
printf_s("oppppssss
");
}
else
{
printf_s("ok");
}

I wanted to check whether the input is a character or not, if a character is given then the output suppose to be "ok", but the output is always "oppppssss", where is the problem here?

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C :: How To Check Input For Non Numeric Value

Mar 20, 2013

Description: This program asks the user to enter a Fahrenheit temperature and then converts it into Celsius and Kelvin temperature.

Code :

#include <stdio.h>
void Temperatures(double temp_F);
int main(void) {
double temp;

[Code]...

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C++ :: Check Wrong Input Data

Jan 20, 2013

i'm making a for loop for a mini game which required the user to enter the input number.Let say if the user accidently entered a character instead of integer the whole program will go haywire so is there anyway to check for the error and prompt the user to input the data again?Here is the simple program...

for(row=0;row<4;row++)
{
printf("Enter Row%d:",row);
for(col=0;col<4;col++)
{
scanf("%d",&num[row][col]);
}

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C++ :: Function To Check For Symbols In Input

Jun 10, 2013

I need a function to check if the inputted string contains a colon. It has to be in an if loop as the condition.

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C++ :: Check Input And Store Value In Array

Nov 8, 2013

This program works but i need to build an additional loop that will re-prompt a user if his initial entry (int y_n) is other than 'Y', 'y', 'N', 'n'. For instance if a user tries to enter 'Yup', he will be prompted "That isn't a valid entry" and then re-asked to enter int y_n.

Note: If user answers Y he is asked to enter a value that is entered into an array. If the user at any point answers N, the program ends and final stats are cout.

#include <iostream>
using namespace std;
int main(){
char y_n;
int i = 0;
float input_value;
float myarray[100];

[Code] .....

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C++ :: How To Check Input Against Entire Array

Oct 16, 2013

If I have a char array that that looks like

char array[] = {'a', 'b', 'c'};

How can I check user input against all of these values at once?

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C# :: Check Input Date Between 2 Dates (not SQL)

Oct 8, 2014

In my WinForm, Our client insists to use Textbox instead of DateTimePicker field, and they want to input in ddmmyy format.

Using Visual Studio 2010 C# 4.0.

PC date time setting: GMT +08:00 dd-MMM-yy.

Assumed today date is 291014 (29-Oct-14).

CodeBehind:

DateTime inputDate;
// the WinForm allows user to input date not earlier than 2 years before today date and not more than 1 months from today date too.
//Assumed I input date as 261014 (26-Oct-14)
if(DateTime.TryParseExact(input, "ddMMyy", new System.Globalization.CultureInfo("en-US"), System.Globalization.DateTimeStyles.None, out inputDate)) {
DateTime minDate = DateTime.Now.AddMonths(-24);//Assumed it is 29-Nov-14
DateTime maxDate = DateTime.Now.AddMonths(1);//Assumed it is 29-Oct-12

I tried many methods but none works (I have checked many threads/forums also).

//Method 1
if(inputDate >= minDate && inputDate <= maxDate)
return true

//Method 2: B return true but A ***always*** return false, Why??
if (inputDate >= minDate)
A = true;

[code]....

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C :: Check To See If String From Standard Input Is Alphanumeric Or Not?

Dec 25, 2014

I'm trying to check to see if a string from standard input is alphanumeric or not. I feel as though there may be a function for this but...

Code:
for(test_pass = i; test_pass < i; i++){
if(test_pass[i] == ('1', '2', '3', '4', '5', '6', '7', '8', '9', '0'))
printf("Your password is alphanumeric!
");
}

The compiler wasn't too happy with this.

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C++ :: How To Improve Validity Check For User Input

Apr 24, 2013

I wonder how can I improve my validity check for user input? I only want them to key in certain range of digit.

Also for my validity check, when I key in character such as ABC, it lead to infinity loop

Here is my code : Code: /*Write a program that can calculate user's age by getting user input their birth date.*/

#include "stdafx.h"
#include <iostream>
#include <time.h>
using namespace std;
int main()
{
int yyyy, mm, dd; //year, month, day
int i = 0; //for the sake of validity check

[Code]...

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C++ :: How To Check For Data Type When Input Value Into Program

Apr 11, 2013

How would I check for proper data type when someone is to input a value into the program? Ex:

int i;
string a;
cout << "Enter a number: ";
cin >> i;
cout >> "Enter a string: ";
cin >> a;

How would you check to make sure that int i would be an actual number and not a letter like "a"?

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C :: Function To Check Whether Input Is Composed ONLY Of Alphabet / Space

Feb 15, 2013

This code is supposed to ask the user to input characters at most 20 and they should only be composed of alphabets/spaces..

Code:
#include <string.h>
#include <stdio.h>
#include <ctype.h>

int main(){
char addressbook[6][30][0];
int current_record = 0, length, i=0;

[Code] ....

I have removed the error from the main code but there's still this lingering error in the return part.

syntax error before 'return'.

It won't compile.

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C++ :: Formatting User Input And Check How Many Words Are In String

Feb 5, 2013

I'm trying to write a short program that takes the input from a user and trims any leading/trailing white space, and then checks how many words are in the string. Problem is, I'm only allowed to use stdio.h and stdlib.h. How can I accomplish this? Also, how would I check if any of the characters which were entered aren't either a number, letter, or '-'?

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C++ :: How To Error Check If User Input Is Letters And Not Numbers

Jun 9, 2014

How do I error check if the user is inputting letters and not numbers? For example, if the user inputs "Lab.txt" I need to display an error message. If they input "Lab2part2.txt" then this is correct and what I want.

I've found a lot of information online on how to error check for numbers or a single letter (EX: 1,2,3, etc. or 'A' 'B' 'C') but nothing for actual WORDS or maybe I should refer to it as a string of characters?

Is there any way to do this? Because my program requires I ask the user to input the name of the file. But the way my code is currently set up is even when the user inputs the wrong file name it still opens the file. I want to prevent this from happening so my thought was to error check user input.

/*Program to determine company's weekly payroll*/

#include <iostream>
#include <string>
#include <fstream>
using namespace std;
void OpenTheFile() {
ifstream inputFile;
string filename;
char letter;
int number;

[Code] .....

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C++ :: Input Integer To A String?

Oct 20, 2014

i wanna put an integer into a string for example:

Code:
string name;
int num=8;
name= "George"
//

I want in the end of George to pas the num variable i ve seen some examples but ive not yet come up with a solution like str.insert();

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C++ :: String Integer Value - Input / Output

Aug 14, 2013

Code:
Prompt the user to input a string,
and then output the sum of all the digits in the string.

Sample Run 1:
Input -> A111B222C
output -> 9

Sample Run 2:
Input -> ABC123XYZ32100000005555555555zzzzzz
output -> 62

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C :: If Put WRONG Input For INTEGER / Program Will Restart

Feb 15, 2015

I have a question about my program.. I would like to make a program that if you put "ABC" on INT, the program will restart again... below are my coding...but it not works..if i put ABC on INT, the "Invalid Mark.. please re-insert mark :" will repeat, repeat and repeat infinitely...

Code:

#include <stdio.h>
void calcul() {int mark;
char * grade;
if (!(scanf("%d",&mark))){printf("
}

[code]....

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C/C++ :: Input Float And Integer And Save It To Txt File

Mar 20, 2014

i am writing a program that requires me to write am input a float and an integer and save it to a txt file. When i try to compile my code i get an error "assignment from incompatible data type". ?

int *intconstant;
float *floatconstant;
int *value;
struct FILE *infileptr, *outfileptr;
infileptr = fopen("/home/brinkmann.brendon/assign14data.txt", "r");
outfileptr = fopen("/home/brinkmann.brendon/assign14report.txt", "w");

[Code]...

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C++ :: Making Diamond Out Of Asterisks Based On Given Odd Integer Input

Sep 6, 2014

I have been tasked with making a diamond out of asterisks based on a given odd integer input. For some reason the bottom half of my diamond will not print. I'm not sure as to why.

Here is my code:

#include "stdafx.h"
#include <iomanip>
#include <iostream>

using namespace std;
int _tmain(int argc, _TCHAR* argv[]){

[Code] ....

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C++ :: Separate Input Integer Into Its Individual Digits And Print

Apr 18, 2013

Write a full C++ program that inputs three-digit integer, separates the integer into its individual digits and prints the digits separated from one another. For example, if the user types 549, the program should print;

5 4 9

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C++ :: Input Validation For 5-digit PIN Number Read From Integer

Oct 22, 2014

The problem states that i need to accept any pin number between "00000" and "99999". I need to read the PIN the user enters as an integer. The problem is that if the PIN is read as an integer, the PIN "01111" will be "1111" which is invalid and the pin "00001" would be read as "1" which is also invalid. How would I go about fixing this problem for PIN numbers that start with a "0"? Again I cannot read the PIN as a char array or string.

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C++ :: How To Stop Floating Point Input Into Integer Variable

Mar 27, 2014

I am trying to make sure no floating point numbers can be input at any time in my roulette program. My code is too long to put in one post so I shall piece it out

#include <iostream>
#include <iomanip>
#include <random>
#include <cstdlib>
#include <ctime>
using namespace std;
// structure of arrays to pass to functions

[Code] .....

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