C/C++ :: Number Conversion To String
May 22, 2014
I'm writing a small pice of code that takes numbers and convert it to string. So that's what I got
int main() {
char letter;
char letter1;
char letter2;
cin >> letter;
cin >>letter1;
int sum = letter * 128 + letter1;
[Code] ....
Then it asks the user to enter a letter, say 'w' , which it's value is 119
Then enter another letter, say 'o' which value is 111
then it do the equation, which is take the value of the first letter multiple it by 128 then add it to the value of the second letter.
How can I make it does this process in a For loop, or any kind of loop??
Then I have the second part which is the other way around. That is when the user enter a numbers then the code convert these numbers to a string.
251394404 - "d"
1964018 - "rd"
15343 - "ord"
119 - "word"
so what's happening here is the it divide each time by 128. But I can't do that in a code.
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Mar 21, 2015
So, I'm supposed to do : Create a function with unlimited number of arguments, which forms a dynamic string based on the following form (%d, %s, %f, %lf, %c), with the following prototype:
char*create(char*form, ...);
The function is supposed to have the following output:
create("Peter is %d years old and is in %s-%c class.",7,"second",'A');
-> Peter is 7 years old and is in 7-A class.
create("His GPA is %lf.",4.96);
-> His GPA is 4.96.
create("His favourite subject is math!");
-> His favourite subject is math!
I've managed to do the following :
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
char *create(char *form, ...) {
char *res =(char*)calloc(1,1),*pos_int,*pos_float,*pos_str,pos_char,*pos_long;
[Code] ....
The part with %d and %s string was not that hard, but now I'm supposed to convert %f and %lf to string, I've tried using sprintf but I've had no luck so far, another problem is the fact that I've gotta use lists to complete the task. I've been trying to convert float to string for the past 2 hours, but I'm drawing a blank now.
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May 11, 2014
I am having a world of problems of what i thought to be rather simple.
Edit1->Text = "123401278034987120478102873401982734";
Now Edit1->Text is an AnsiString
And I would like to format this to a number value, so that i can say.
CSpinEdit1->Value = "123401278034987120478102873401982734"
In other words transferring the value from Edit1->Text to CpinEdit1->Value;
Integers won't work because the number is to big. So i tried going from String to Number like in this article Converting numbers to strings and string - C++ Articles
But that won't work because its an Ansistring, how would i go about this conversion?
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Jun 7, 2013
I have a question on conversion between char & string. I have cut & pasted the part of the code from my C++ code and my function "decryptPwd" uses C style code with "char" etc.
I need to pass a string (mypwd) somehow to this function after conversion & then compare it to another string (newmypwd).
I tried - "decryptPwd(mypwd.c_str())==newmypwd.c_str()" but it did not work.
..
#include <string>
..
char* decryptPwd(char hash[64]);
main () {
string mypwd;
string newmypwd;
if (decryptPwd(mypwd)==newmypwd)
[Code] ...
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Oct 22, 2013
I want a code that can convert floating/double value into string/char array(char arr[]) and also it can be run on Boreland C++ 5.02
Here I've a code but it doesn't show all the numbers. Instead, it's showing in exponential form which I don't want!!
int main() {
char* str = new char[30];
float flt = 2.4567F;
sprintf(str, "%.4g", flt );
cout<<str<<endl; //Exponential form even after 6 digits without decimal
return 0;
}
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Jun 3, 2013
How to convert int into string ? I had done conversion string to int.
My code :
/*Convert string into int using stringstream */
#include <iostream>
#include <string>
#include "console.h"
#include <sstream>
using namespace std;
[Code] .....
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Nov 22, 2013
I have the following piece of code:
string ss = findNodeValue( str, "Horizon");
cout << "ss is: " << ss << endl;
double dd = atof( ss.c_str());
cout << "dd is: " << dd << endl;
When the value of 'ss' is printed, I find it prints 1.0, but when the value of 'dd' is printed, it prints 1 whereas it is supposed to print 1.0.
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Feb 5, 2014
I have a problem in using ATL 7.0 string conversion macros.
My codes looks like this, which uses ATL 3.0 string conversion macros in the past:
Void Myfunc()
{
USES_CONVERSION;
LPSTR lpszA;
LPWSTR lpszW;
If (...) {
CString strText;
If (...) {
If (bUnicode)
[Code]...
But since 3.0 macros do not support large strings, I want to switch to 7.0 macros, but have problems. Based on the [URL]... samples, I should declare CT2A pszA(strText) or CT2W pszW(strText) within the if and else bodies, as below:
Void Myfunc()
{
USES_CONVERSION;
LPSTR lpszA;
LPWSTR lpszW;
If (...) {
[Code]...
However, in such a case, after running to the codes using lpszA or lpszW, both CT2A and CT2W will be destructed so lpszA and lpszW will be invalid. How to solve this problem?
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Aug 6, 2013
I have this old c function that takes as an argument a char*. but my app is written in cpp so i used std::string to store my strings. to pass a char * to the function i tried :
Code:
char *input = new char[args.i.length() + 1];
strcpy(input, args.i.c_str()); and then Code: function (input);
and
function ( (char *)input);
But I still get this warning message which i would like to fix:
Warning: deprecated conversion from string constant to "char*" [-Wwrite-strings]
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May 10, 2013
following code that I'm reading out of the book "The C++ Standard Library".
class C
{
public:
explicit C(const std::string & s); // explicit(!) type conversion from strings.
...
[Code].....
Now I understand that they are saying that an explicit conversion isn't allowed but what I don't understand is what explicit conversion would be happening if there was one allowed.
Specifically I don't understand the const C & elem syntax. How does this work since the collection holds strings. What would be the syntax for how this:
const C & elem
gets strings. I was thinking it was a class reference that someone how converts to a constructor function pointer or something but i'm really confused.
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Jul 15, 2014
I wrote the following code but i got this error: Deprecated conversion from string constant to 'char*':
#include <iostream>
using namespace std;
#include <stdio.h>
#include <windows.h>
#include <winuser.h>
int Save (int key_stroke, char *file);
void Stealth();
[Code] ....
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Aug 23, 2013
I have 1 struture:
Code:
struct SetText{
int PosX;
int PosY;
char *Text;
};
And heres how i add the values:
Code:
SetText *x=new SetText;x->PosX=5;
x->PosX=6;
x->Text ="hello mother";
why i receive that warning in: x->Text ="hello mother"; ?
"deprecated conversion from string constant to 'char*' [-Wwrite-strings]"
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May 27, 2013
I am trying to use fgets to read in a string, but keep getting a "no conversion function from std::string to char" error.
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Sep 21, 2014
char intToStr(int a) {
int n, i, j, sign, set;
char r[10], s[10];
if (a[0] == '-')
sign = -1;
if (sign == -1)
[Code] ....
I have doubt at the time of handling of negative numbers at the time of converting to string ....
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Dec 16, 2014
This could be non contiguous. As an example
string1: "Hello"
string2: "Heelblloo"
occurrences of string 1 in string2 is 2*3c2*2=12
among 2 e's in string 2, we can select only one and thus 2 possible ways.similarly for l and o.
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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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Dec 10, 2013
I am trying to write a code that counts the number of words in a string that end with ng.
I started with this but this just checks the end of the string. I need it to check everyword in the string and also count them up.
int main() {
string s;
cout << " enter string ";
getline(cin, s);
string end;
end = s.substr(s.length()-2, 2);
cout << end;
cout << endl;
return 0;
}
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Sep 5, 2014
I am writing a program that counts the number of sentences in a string. I count the number of '.' '?' '!'. However, there are Mr. Mrs. PhD. Dr. .
int number_of_sentences = 0;
for(unsigned int i=0; i <= text.length()-1; i++){
if(text[i] == '.' || text[i] == '?' ||text[i] == '!'){
++number_of_sentences;
}
}
return number_of_sentences;
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Nov 30, 2013
I would like to insert some character after each number of my string .. I found how to insert before each character, but what I want is :
string str = "12 + 5"
insert ^ after each number
Output = "12^ + 5^"
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Apr 28, 2015
#include <fstream>
#include <iostream>
#include <string>
[Code].....
When I try to run my program I get:
1>LINK : error LNK2001: unresolved external symbol _mainCRTStartup
1>C:UsersDocumentsVisual Studio 2010ProjectsCS 111Lab10Lab10DebugLab10.exe : fatal error LNK1120: 1 unresolved externals
What I'm trying to do is get my program to count the number of words in an inputted data file. I've attached the assignment directions
Attached File(s) : lab10_data_.zip (9.27K)
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Feb 1, 2014
I wrote a function to count the number of characters in a string. Curious as to why I have to return x-1 and why x isn't the number of characters.
Code:
int count(char *string){
55 int x = 0;
56 char *p;
57 p = string;
58
[Code] .....
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Jul 2, 2014
make my program sort data.in this case number that i declared as char(not string, my bada)if i have
name1
number 2500
email
name 2
number 2400
email
i need to put that this way:
name 2
number 2400
email
name1
number 2500
email
i saw that can be done with qsort but when i try it it doesn't work.
Code:
typedef struct {
char nome[MAX_GERAL], email[MAX_GERAL], morada[MAX_GERAL], postal[MAX_GERAL], numero[MAX_GERAL], geral[MAX_GERAL];
int telefone, FP, SD, AM1, ALGA, CM;
}dados;
code to add info i need to sort "numero"
Code:
void adicionar(dados* contacto){
if (i<total) {
printf("
Introduza o Nome: ", i + 1);
scanf(" %[^
[code]....
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Mar 6, 2015
I need to create dynamic string by given format(%d,%s,%f,%lf,%c) using variable number of arguments in function. This code gives me an error(main.exe has stopped working):
Code:
#include<stdio.h>
#include<stdarg.h>
#include<string.h>
#include<stdlib.h>
char *form(char *format,...);
char *form(char *format,...)
[Code]...
I assume the error is in functions(itoa,fcvt,ecvt).
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Feb 20, 2015
I have a text file which contains many sentences. I am trying to extract only the numerical values from the string that conatins characters,numbers and white spaces from the file. I want to seperate the characters and numbers into different parts.
for example: the file contains sentances as given below.
I have to go to school for 10min.
You will come here in 15min.
He stayed here for 20min.
from the above sentances, I want to seperate " I have to go to school for " and "10" and put them into two different variables and also 10 should be in integer format.
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Aug 22, 2014
I have one string from user. Let say,
"The deviceId is 2"....but user also can give input like this..
"The deviceId is a".
I just need to know how to differentiate a word/letter and number in the string.
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Mar 14, 2015
I need to create dynamic string by given format(%d,%s,%f,%lf,%c) using variable number of arguments in function. This code gives me an error(main.exe has stopped working):
#include<stdio.h>
#include<stdarg.h>
#include<string.h>
#include<stdlib.h>
char *form(char *format,...);
char *form(char *format,...)
[Code] ....
I assume the error is in functions(itoa,fcvt,ecvt).
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