How to get user input for character array in the following program? (C++)

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In the main function, how do i get user input array for char X and char Y? ie. instead of assigning value to char as Char X[ ]= "AGGTAB" or char Y[ ]= "GXTXAYB", how can i give it as an input?

eg:

INPUT:
AGGTAB
GXTXAYB

OUTPUT:
The length is 4

What I have tried:

C++

/* A Naive recursive implementation of LCS problem */
#include<bits/stdc++.h>

int max(int a, int b);


int lcs( char *X, char *Y, int m, int n )
{
if (m == 0 || n == 0)
	return 0;
if (X[m-1] == Y[n-1])
	return 1 + lcs(X, Y, m-1, n-1);
else
	return max(lcs(X, Y, m, n-1), lcs(X, Y, m-1, n));
}


int max(int a, int b)
{
	return (a > b)? a : b;
}


int main()
{
    
  char X[] = "AGGTAB";
  char Y[] = "GXTXAYB";

int m = strlen(X);
int n = strlen(Y);

printf("Length of LCS is %dn", lcs( X, Y, m, n ) );

return 0;
}

Posted 23-Jan-18 5:45am

Renshinzen

Updated 23-Jan-18 11:25am

v3

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Comments

OriginalGriff 23-Jan-18 12:03pm

This is not a good question - we cannot work out from that little what you are trying to do.
Remember that we can't see your screen, access your HDD, or read your mind - we only get exactly what you type to work with.
Use the "Improve question" widget to edit your question and provide better information.

Renshinzen 23-Jan-18 12:04pm

Thanks...i'll work on it.

jeron1 23-Jan-18 12:03pm

Maybe take a look here for some options;c - C101: the best way to fill an array from user input? - Stack Overflow[^]

2 solutions

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CPallini · Accepted Answer · 2018-01-23T11:24:00

Hey man, it is C++ !

C++

#include <iostream>
#include <string>

int lcs( const std::string & X, const std::string  & Y, size_t m, size_t n )
{
  if (m == 0 || n == 0)
    return 0;
  if (X[m-1] == Y[n-1])
    return 1 + lcs(X, Y, m-1, n-1);
  else
    return std::max(lcs(X, Y, m, n-1), lcs(X, Y, m-1, n));
}

int main()
{
  std::string X,Y;

  getline(std::cin, X);
  getline(std::cin, Y);

  std::cout << "Length of LCS is " << lcs(X,Y, X.size(), Y.size()) << std::endl;
}

Richard MacCutchan · Accepted Answer · 2018-01-23T06:46:00

Solution 1

Use gets, _getws[^].

Posted 23-Jan-18 6:46am

Richard MacCutchan