C++ :: Using While Loops To Validate String Input
Jul 2, 2013
Im having trouble with the while loop, this program should ask the user for their name, if incorrect it should send an error msg and ask for input again...after the correct name is entered the program should prompt the user to enter a password, again if incorrect it should send an error msg and ask for input again.
the code below does what it should when asking for a name..HOWEVER it does not allow the user to enter a password and instead jumps straight to the error msg..
#include<iostream>
#include<string>
#include<iomanip>
using namespace std;
int main() {
// Variables
string username;
string password;
[Code] .....
After the correct name is entered, the program displays this:
"Welcome, Sadia Rajput."
"To continue, enter your password: That is incorrect, enter password: "
I would prefer to do this using the while loops and not bool statements
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Oct 24, 2013
For the following program, I'd like to make sure the user input is between 1 and 40 characters. To do this, how would I complete the if statement below?
Code:
char p_input[41];
printf("Enter a name (1-40 characters):");
fgets(p_input, 41, stdin);
if (p_input ....??
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Aug 5, 2014
I'm having a problem with the two while statements in my UDF.
- 1. It will run both while loops twice...?
- 2. It now goes into a continuous loop.
- 3. When it did work, it would only return 1 value to the main()...?
#include <iostream> // for use of "cin" & "cout", endl...
#include <iomanip> // for formatting setw function
#include <cmath> // for the general math computations
#include <string> // for creating descriptive strings
#include <sstream> // used to convert a string to an integer
//user defined function
int userValue (int);
[code].....
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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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Mar 1, 2014
I am writing a program to display a triangular pattern using nested loops and user input for the size of the base and character used to generate the image. 99% of the program runs fine. However I am having trouble with some of my input validation.
When given an integer value for the base I can verify if it is within a certain range (0-80). However, when the user inters a "char" instead of an "int" the program enters an infinite loop.
Here is the piece of code giving me trouble. (I wont bother you with the entire chunk of code, I have commented out everything else to narrow down the problem bit)
// Pattern Displays
// program that asks user for the size of the base of a triangle and then generates it in a character the user chooses
#include <iostream>
#include <istream>
#include <string>
#include <cstdlib>
using namespace std;
int main () {
char escape;
[Code] ....
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Oct 23, 2014
understanding how to do loops with string arrays.
If I have few string arrays with some elements, for example:
string pizza[3]= {"ham", "tomato", "chees"};
string pasta[3]= {"tomato", "chicken", "olive"};
I wonder how, if I was to ask user for example:
string ingredient;
cout << " Please type an ingredient: ";
cin >> ingredient;
If user was to type in tomato, how can I loop it, to get an output like:
Pizza and pasta have tomato as an ingredient.
Is there any other way, to get the same result for this kind of problem.
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Oct 5, 2012
I am new to C++ and I want to validate the xml based on the XML Schema in C++. Some tools/libraries to achieve that.
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Jul 14, 2013
How would I validate the date?
struct Inventory {
char SKU[SKU_SIZE];
char category[CAT_SIZE];
int qty;
double cost;
char date[CAT_SIZE];
[Code] .....
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Oct 12, 2012
I've sometimes encountered unexpected runtime issues caused by unsigned values being decremented below zero.
Example 1: "unsigned_value += negative_integer_value;"
Example 2: "for( size_t i = size - 1; i >= 0; --i )"
My compiler doesn't provide any compile-time or run-time warnings.
As far as I know, it's not possible to overload operators of primitive data types to check if the unsigned value is decremented below zero.
Any clever strategy to trace such cases at debug runtime, without having to add asserts all over the code? It's important that it does not affect performance in release mode.
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Jun 21, 2014
I am trying to build a employee management system using C, and I have done alot so far. Everything seems to work fine, but then I thought that I should let the user store the data of their employees permanently, therefore I created a file and then I store the user's given data in the txt file.
Here is the code:
#include<stdio.h>
#include<conio.h>
#include<string.h>
[Code].....
But there is some problem, and I don't seem to understand what is the problem in the code, it's just that whenever the user enters any id to search, and presses any key then nothing appears just a blank screen! I wanted to know that how can I check the ID from the text file and then display the details of the employee of that id!
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Apr 30, 2012
How to validate if the item you want to add in the cart is already exists in listView items? for example I already add CH001 which is the productId of Chocolate strawberry, then I accidentally add again that product Id and I what I want is that it should not be accepted on my listview again because CH001 is already on my cart.
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Sep 24, 2014
How to validate the data if the data already exist in the table record in c#?
For example I wanted to add the student roll no. if roll no. is 134 and if we are adding rollno. 134 student then we get the warning like roll no. 134 is already exist ....
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Oct 19, 2014
Very new to programming, and I know that there must be another way on inputting a string into each array cells not by just inputting it one by one, but as a whole. My code at the meantime is: [URL]
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Jul 14, 2014
I have problem with string compare. I want to compare the string user input with a string in binary. And I don't know how to do it. Problem in function login();Here is the code: And you also can download file in attachment too..
Code:
#include<conio.h>#include<dos.h>
#include<stdio.h>
#include<process.h>
#include<string.h>
char nsb=1;
char ch, password[20], passlogin[20], inputpass[20], checked[20];
FILE *fp;
}
[code]....
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May 29, 2014
I wrote a program that reads a list from a file and stores it in a string type vector. Now, I want the user to input a word so that the program can search the vector to see if that word already exists. I have used every possible way of reading input from the console and storing it in order to compare with the vector but it never results in a match. When I print the input string and the vector string they are exactly the same thing (or at least print to the console as if they were). I've tried using getline; using cin direct to a string var; using cin to a char array and then casting to string using string str(arr); I even added a newline at the end just in case and STILL I cannot get a match.
vector <string> currentSet; //read a list in from a file and has 9 items in it
cin.ignore();
string line;
getline(cin, line);
if(line == vector[0]){//if printed to console line is HEAT and vector[0] is HEAT
cout<<"match"<<endl;
}
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Dec 3, 2014
write a program that prompts the user to input a string and outputs the string in uppercase letters. (Use a character array to store the string.) Does this follow the criteria? This program is very similar to one I found on these forums but I have one problem, it outputs everything backwards! EX: dogs will output to SGOD. What I need to do to make it output correctly, I think it may have to do with getline?
#include <iostream>
#include <cctype>
#include <cstring>
using namespace std;
int main() {
char let[100];
cout << "Enter what you would like to be UPPERCASE: ";
[Code] ....
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Feb 7, 2013
I am stuck in this program, Be given a string of chars, where each single char belongs to the following alphabet: a..zA..Z0..9 (So, in the string there are only lowercases, uppercases and digits. No blank, no comma, ...). For every char of the given alphabet, count how many times in the string
1-- the char belong to a sequence of identical chars whose length is at least three (i.e.: in the string cc74uyrpfccc348fhsjcccc3848djccccc484jd for three times the character 'c' satisfies this condition)
Code:
#include<stdio.h>
#include<conio.h>
#include<string.h>
[Code]...
2-what is the longest substring of characters strictly rising interm of ASCII code(the following is greater (>) of the previous)
3- what is the longest substring of successive characters interm of given string rannge (i.e.: fhkjshdfruytyzABCDEfglsj => 7)
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Jun 26, 2014
/*assume array is already initialized and declared and is of array type string.*/
int i = 2;
int j = 1;
string newvalue;
cout<<"Current value at array[i][j] is "<<array[i][j]<<endl;
cout<<"Enter new value "<<endl;
cin>>newvalue;
array[i][j]= newvalue; //PROBLEM IS IN THIS LINE.
cout<<endl;
cout<<array[i][j]<<endl;
I'm having lots of trouble with storing a cin string text into a string array. It just seem that after I cin newvalue, the program crashes. Is this way of storing it considered illegal? I'm just a beginner with 5 months of coding experience in C++.
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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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Sep 15, 2013
So I was trying to input a string and get it reversed. I came up with his code. It is supposed to work by first creating two strings, then I get the input of a string and then try to reverse it using a while loop. However the output each time is pure garbage, what exactly have I overlooked?
Code:
#include <stdio.h>#include<stdlib.h>
int
main (void) {
char z[255];
char y[255];
int x,r=0;
[Code] .....
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Apr 15, 2014
I have an assignment where I need to write a hangman program. I have almost all of it done, however, I am having trouble getting my head around checking to see if the letter guess is in the string and how many times. This is my code, the section in comments is where I am having the trouble.
Code:
#include <stdio.h>
#include <ctype.h>
int main() {
char word[10]; //secret word array
char wguess[10]; //word guess array
char lguess; //letter guess
int i;
[Code] .....
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May 24, 2014
I'm having trouble printing the text in between separators like commas, periods, and at signs. I'm following Jumping into C++ Chapter 19 Practice Problem 2.
This is what I have so far:
Code:
#include <iostream>#include <string>
usingnamespacestd;
int findNeedle (char separator, string inputLine) {
int needleAppearences = 0;
[Code] ....
And this was my test run output:
Enter the contact info. one, two, three, ,? , one two, th three, Program ended with exit code: 0
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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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Sep 16, 2013
I'm extremely rusty at C but is this the best way to store an input string into a char*?
Code:
int length = 100; //initial size Code: char * name = malloc(length * sizeof(char)); //allocate mem for 100 chars
int count = 0; //to keep track of how many chars have been used
char c; // to store the current char
while((c = getchar()) != '
'){ //keep reading until a newline
if(count >= length)
name = realloc(name, (length += 10) * sizeof(char)); //add room for 10 more chars
name[count++] = c
}
Is this a good way and what could be better?
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Mar 6, 2015
I'm doing error checks in C and I'd like to know how to restrict the input of a string to 2 letters and if it is exceeded, i'd like to loop and ask for the code to be re-entered.
Code:
for (i = 0; i < code7; i++)
{
printf("Enter number of items: ");
scanf("%d", &item_qty[i]);
[Code].....
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Jul 23, 2013
I need to ask the user to input a number, and then put the number in a string array. so for example if the size of the number was 4: example 1200
i would make him put the number like that
for (i1=0; i1 < 4; i1++)
cin >> Num1[i1];
where Num1[] is a char array type. yes and it works.
But my question is what if I do not know how many numbers will the user put, how do i extract the size of the total characters existing in a number?
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