So right now I have this code that generates random letters in set increments determined by user input.
#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;
int sLength = 0;
static const char alphanum[] =
"0123456789"
"!##$%^&*"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz";
int stringLength = sizeof(alphanum) - 1;
char genRandom()
{
return alphanum[rand() % stringLength];
}
int main()
{
cout << "What is the length of the string you wish to match?" << endl;
cin >> sLength;
while(true)
{
for (int x = 0; x < sLength; x++)
{
cout << genRandom();
}
cout << endl;
}
}
I'm looking for a way to store the first (user defined amount) of chars into a string that I can use to compare against another string. Any help would be much appreciated.
Just add
string s(sLength, ' ');
before while (true), change
cout << genRandom();
to
s[x] = genRandom();
in your loop, and remove the cout << endl; statement. That will replace all of the printing by putting the characters into s.
Well, how about this?
std::string s;
for (int x = 0; x < sLength; x++)
{
s.push_back(genRandom());
}
#include<algorithm>
#include<string>
// ...
int main()
{
srand(time(0)); // forget me not
while(true) {
cout << "What is the length of the string you wish to match?" << endl;
cin >> sLength;
string r(sLength, ' ');
generate(r.begin(), r.end(), genRandom);
cout << r << endl;
}
}
Related
So I have built a small basic data encrypter (for learning purposes only). It is working perfectly fine but it reads only a single line of input. Is it my Editor problem or my code have some issues.
ps: I use CodeBlocks
#include <iostream>
#include <ctype.h>
using namespace std;
int main()
{
std::string str;
char enc;
int word;
cout << "\t\t\t\t\t\t\t\tENCRYPTOR" <<endl;
cout << "\t\t\t\t\t\t\t\t---------" <<endl;
cout << "Enter a Word: ";
getline(cin, str);
int n = 0;
cout << "\n\n\t\t\t\t\t\t\t\tENCRYPTED D#T#" <<endl;
cout << "\t\t\t\t\t\t\t\t--------------\n\n" << endl;
for(int i = 0; i < str.length(); i++){
int randomAdd[5] = {5,6,2,3,2};
int size = sizeof(randomAdd)/sizeof(randomAdd[0]);
// for(int j = 0; j < 5; j++){
word = str.at(i);
if(i%5 == 0){
n = 0;
}
enc = int(word) + randomAdd[n];
std::cout << char(enc);
n++;
}
return 0;
}
This works
Hello World
But I cannot enter this
Hello World
Have a nice day
because then the program exits command prompt without any error or message.
How can I read more than one line?
You can do as
#include <iostream>
using namespace std;
int main() {
string str;
while (getline(cin, str)) {
cout << str << endl;
}
return 0;
}
This code sample allows you to input multiple lines interactively from the command line/shell
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
using namespace std;
int main()
{
string str;
char enc;
int word;
vector<string> myInput;
cout << "\t\t\t\t\t\t\t\tENCRYPTOR" <<endl;
cout << "\t\t\t\t\t\t\t\t---------" <<endl;
while (str != "Enigma")
{
cout << "Enter a line (Write Enigma to exit input): ";
getline(cin, str);
myInput.push_back(str);
}
int n = 0;
cout << "\n\n\t\t\t\t\t\t\t\tENCRYPTED D#T#" <<endl;
cout << "\t\t\t\t\t\t\t\t--------------\n\n" << endl;
for(auto & myInputLine : myInput)
{
str = myInputLine;
for (size_t i = 0; i < str.length(); i++) {
int randomAdd[5] = { 5,6,2,3,2 };
int size = sizeof(randomAdd) / sizeof(randomAdd[0]);
word = str.at(i);
if (i % 5 == 0) {
n = 0;
}
enc = int(word) + randomAdd[n];
std::cout << char(enc);
n++;
}
}
return 0;
}
The input is finished if Enigma is written.
All input is stored in the vector container of the STL, see vector.
Afterwards, all the lines are encrypted by your algorithm.
Hope it helps?
I have a string that contains X words (between each word there is a space) I have to move the words in a circular motion to the left according to the number that the user inserts. For example:
"hi my name is aviv and",
the user entered 2. "name is aviv and hi my" I'm looking for legality that repeats itself but I can not find.
Thanks for the guidance. Most importantly, I can not use built-in libraries
Update:
I see there are examples with libraries, I can not use any library.
So what I've done so far.
I wrote a function that gets a string and a number from the user, to move left.
Before sending the string to the function I try to calculate the number of characters I need to move.
My output is - "name is avivhi my"
Regarding the function:
When it gets a string without spaces it works great.
This is my code:
int main()
{
char str[] = "hi my name is aviv";
char str2[] = "hi my name is aviv";
int CountSpace = 0, CountWord = 0;
int Size = 18, flag = 0;
int MoveLeft, Index = 0;
for (int i = 0; str[i] != '\0'; i++)
{
if (str[i] == ' ')
{
CountSpace++;
}
}
CountWord = CountSpace + 1;//Understand how many words there are in a string.
cin >> MoveLeft;
if (MoveLeft >= CountWord)//
{
MoveLeft = (MoveLeft - ((MoveLeft / CountWord) * CountWord));//the size of movment;//To reduce the amount of moves if there is such a possibility
}
for (int i = Size - 1; i >= 0; i--)
{
if (str[i] == ' ')
{
flag++;
}
if (flag == MoveLeft)
{
Index = Size - 1 - (i + 1);//That's the amount of characters I have to move
break;
}
}
MoveLeft = Index;
//This code belongs to the function that accepts a string and the amount to move the characters
for (int i = 0; i < Size; i++)
{
if (i + MoveLeft < Size)
{
str[i] = str2[i + MoveLeft];
}
else
{
str[i] = str2[(i + MoveLeft) - Size];
}
}
cout << "Move Left: " << MoveLeft << endl << str << endl << str2 << endl;
return 0;
}
Here's a hint:
vector<string> words = Your_Code_To_Split_Input_Into_Words();
int count = words.size();
int shift = Your_Code_To_Read_Users_Input();
// print the sentence with the rotation specified by shift
for (int i = 0; i < count; i++)
{
int shifted_index = (i + shift) % count; // modulo math implements circular rotation
string spacing = (i == 0) ? "" : " "; // add a space before each word, except first word
cout << spacing << words[shifted_index];
}
cout << endl;
One possible answer, i highly recommend using vectors instead of regular arrays, it's easy and more dynamic, but i didn't use it because you said you can't use built-in libraries.
#include <iostream>
#include<string>
using namespace std;
int main() {
string a[10000];
int counter = 0;
string b = "hi my name is aviv and";
string temp = "";
int userNum = 2;
for(int i=0;i<b.length() ; i++){
if(b[i]!=' '){
temp+=b[i];
}
else if(b[i]==' ' && temp.length()){
a[counter]= temp;
temp = "";
counter++;
}
}
if(temp.length()){
a[counter] = temp;
}
for(int i=userNum;i<=counter+userNum;i++){
cout<<a[i%(counter+1)]<<endl;
}
}
If you can make use of std::rotate() from <algorithm>, this is much easy to do with that. Parse the words using std::stringstream and store to std::vector. Then apply the shif directly to the vector.
Sample Output: https://www.ideone.com/rSPhPR
#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <sstream>
int main()
{
std::vector<std::string> vec;
std::string str = "hi my name is aviv and";
std::string word;
std::stringstream sstr(str);
while(std::getline(sstr, word,' '))
vec.emplace_back(word);
int shift;
std::cout << "Enter the Shift: ";
std::cin >> shift;
std::rotate(vec.begin(), vec.begin() + shift, vec.end());
for(const auto& it: vec)
std::cout << it << " ";
return 0;
}
Here's a snippet :
#include <iostream>
#include <string>
#include <sstream>
using namespace std;
#define MaxWords 10
int main()
{
stringstream ss;
ss.str("hi my name is aviv and");
string str[MaxWords];
int i;
for (i =0; std::getline(ss, str[i],' ');i++ )
{
cout << str[i] << " ";
}
int n;
cout << "\nEnter pos to split : ";
cin >> n;
for (int j = n; j <= i; j++)
{
cout << str[j] << " ";
}
for (int j = 0; j < n; j++)
{
cout << str[j] << " ";
}
cout << endl;
return 0;
}
Output:
I'm trying to make a program that asks the user to input a string then checks to see how many vowels and consonants are in the string, using c strings. Right now I'm working on the function that counts the vowels. I finally got it to were I don't have any errors, but my program just hangs up after choosing to count the vowels. Here is my code.
#include "stdafx.h"
#include <iostream>
#include <string.h>
using namespace std;
class VowelsandConsonants {
public:
int findVowels(char *cString, const int STRINGLEN) {
const int SIZE = STRINGLEN;
int vowelCount = 0;
char *str = cString;
char vowels[5] = { 'a', 'e', 'i', 'o', 'u' };
for (int i = 0; i < SIZE; i++) {
str[i];
for (int j = 0; j < SIZE; i++) {
vowels[j];
if (strcmp(vowels, str)) {
vowelCount++;
}
}
}
return vowelCount;
}
};
int main()
{
char *myString = nullptr;
const int STRLEN = 20;
int selection;
myString = new char[STRLEN];
VowelsandConsonants v;
cout << "Enter a string 20 characters or less." << endl;
cin.getline(myString, STRLEN);
cout << "Select the number of what you want to do." << endl;
cout << "1.) Count the number of vowels." << endl;
cout << "2.) Count the number of consonants." << endl;
cout << "3.) Count both vowels and consonants." << endl;
cout << "4.) Enter another string." << endl;
cout << "5.) Exit program." << endl;
cin >> selection;
if (selection == 1) {
cout << v.findVowels(myString, STRLEN);
}
delete[] myString;
return 0;
}
Am I approaching this the right way?
I recommend using a C-Style string containing the vowels, then using strchr to search it:
const char vowels[] = "aeiou";
const size_t length = strlen(cString);
unsigned int vowel_count = 0;
for (unsigned int i = 0; i < length; ++i)
{
if (strchr(vowels, cString[i]) != NULL)
{
++vowel_count;
}
}
There are other methods, such as using an array to hold the counts (and using the letter as an index) or std::map.
i am trying to print an array of unknown length backwards so wrote that the loop should start at the terminator and go to the first letter printing each letter but it keeps printing only the first
#include <iostream>
using namespace std;
int main()
{
char word[10];
int i;
cout << "Enter a word: " ;
cin >> word;
for ( word[i]= '\0'; word[1] <0; word[i] --)
{
cout << word[i] << endl;
}
return 0;
}
You can print you C-style string backwards whith this one-liner:
reverse_copy(word,word+strlen(word),ostream_iterator<char>(cout));
Also please consider using std::string:
string word;
cin >> word;
copy(word.rbegin(),word.rend(),ostream_iterator<char>(cout));
You will need to #include the following headers for the above examples to work:
<algorithm>, <iostream>, <iterator>, <string> and <cstring>
Replace your loop it does nothing:
for (i= strlen(word); i >=0; i--)
{
cout << word[i] << endl; //endl is optional
}
Also for in case of long strings you may have to increase size of char array or its better to use
string word;
for (i= word.size(); i >=0; i--)
{
cout << word[i] << endl; //endl is optional
}
Here is a simple way to print a C-style string backwards.
for (size_t i = 0, i_end = std::strlen(word); i != i_end; ++i)
{
std::cout << word[i_end - i - 1];
}
std::cout << "\n";
Note that I save the result of strlen so that it is not called every time.
To get the result you want, you might want to use this code...
char word[10];
int sz;
do {
cout << "Enter a word: ";
cin >> word;
sz = strlen(word);
} while (sz > 10);
for (int i = sz; i >= 0; i--)
{
cout << word[i];
}
I am writing a function int count_words(string str) that returns a count of all of the words in the string.
The issue is that regardless of the input, the result is 1. Can anyone help?
#include <iostream>
#include <string>
using namespace std;
int count_words(string str)
{
int i,j;
j = 1;
int l = str.length();
for(i = 0; i < l; i++)
{
string c = str.substr(i,1);
if(c == " ")
{
j++;
}
}
cout << "The total word in the string: " << j << endl;
return j;
}
int main()
{
string str;
cout << "Please enter a string: ";
cin >> str;
int result = count_words(str);
return 0;
}
You should use cin.getline if your string contains spaces, as using the >> operator with cin only reads up to the next whitespace
See std::cin input with spaces?
Consider iterating over the string:
auto cstyle= str.c_str();
for (int i = 0; i < str.length(); ++i)
{
if (cstyle[i]==' ')//assumes words are delimited by a single space
{
j++;
}
}
You should use: cin.getline, for example:
int main()
{
cout << "Please enter a string: ";
unsigned size=10;
char*chr=new char[size];
cin.getline(chr,size);
string str(chr);
//cin >> str;
int result = count_words(str);
return 0;
}