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Need help comparing array to a string from text file.

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Join Date: May 2009

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kailisr

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Need help comparing array to a string from text file.

May 19th, 2009

//I am haing trouble creating this program. There is basically only one part that I can't figure out. I need to match up my array to my string. I need something that will force the first strings in each to equal eachother, then use a counter to match the rest. I know it needs to be a DO loop. Maybe something like:
//for (code[1] == code2[1]; counter++;
//or
//for (code[counter] == code2[counter]; counter++;
//This is what I have so far:

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include <iostream>
#include <string>
#include <fstream>
using namespace std;
 
int main()
{
int counter;
int counter2;
int code[26];
string code2[26];
string word;
int sWord;
char letter;
int i;
bool quit = false;
 
 
 
ifstream inNumData;
ifstream inStrData;
inNumData.open("code.txt");
inStrData.open("code2.txt");
 
for (counter = 0; counter < 25; counter++)
{
	inNumData >> code[counter];
}
for (counter2 = 0; counter2 < 25; counter2++)
{
	inStrData >> code2[counter2];
}
do
{
for (code[1] = code2[1];
	 counter++;
}
 
inNumData.close("code.txt");
inStrData.close("code2.txt");
 
	cout << "A - Convert a word into secret code." << endl;	
	cout << "B - Convert a secret code back into a word." << endl;
	cout << "C - Quit Program." << endl;
	cout << "Please enter your choice: ";
	cin >> letter;
 
switch (letter)
{
case 'A':
case 'a':
	cout << "Enter the word to be converted into secret code." << endl;
	cin >> word;
	cout << sWord << endl;
break;
 
case 'B':
case 'b':
	cout << "Enter a secret code to be converted to the word." << endl;
	cin >> sWord;
	cout << word << endl;
	break;
 
 
case 'C':
case 'c':
 
quit = true;
}
return 0;
	}
#include <iostream>
#include <string>
#include <fstream>
using namespace std;

int main()
{
int counter;
int counter2;
int code[26];
string code2[26];
string word;
int sWord;
char letter;
int i;
bool quit = false;



ifstream inNumData;
ifstream inStrData;
inNumData.open("code.txt");
inStrData.open("code2.txt");

for (counter = 0; counter < 25; counter++)
{
	inNumData >> code[counter];
}
for (counter2 = 0; counter2 < 25; counter2++)
{
	inStrData >> code2[counter2];
}
do
{
for (code[1] = code2[1];
	 counter++;
}

inNumData.close("code.txt");
inStrData.close("code2.txt");

	cout << "A - Convert a word into secret code." << endl;	
	cout << "B - Convert a secret code back into a word." << endl;
	cout << "C - Quit Program." << endl;
	cout << "Please enter your choice: ";
	cin >> letter;

switch (letter)
{
case 'A':
case 'a':
	cout << "Enter the word to be converted into secret code." << endl;
	cin >> word;
	cout << sWord << endl;
break;

case 'B':
case 'b':
	cout << "Enter a secret code to be converted to the word." << endl;
	cin >> sWord;
	cout << word << endl;
	break;
	

case 'C':
case 'c':

quit = true;
}
return 0;
	}

Last edited by John A; May 20th, 2009 at 3:05 am. Reason: removed [tex] tags

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Salem

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Re: Need help comparing array to a string from text file.

May 20th, 2009

> for (code[1] = code2[1];
Perhaps you could post something which actually compiles.

Then post something which is reasonably indented.

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kailisr

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Re: Need help comparing array to a string from text file.

May 20th, 2009

I know it doesn't compile, I get errors because there is no argument. And I probab'ly would have been worried about that statements indentation if it worked.
If I knew how to finish this than I wouldn't need help and I wouldn't have asked for suggestions.

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Dave Sinkula Dave Sinkula is offline

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long time no c

Re: Need help comparing array to a string from text file.

May 20th, 2009

Help with Code Tags

(Toggle Plain Text)

6.8.5 Iteration statements
Syntax
   iteration-statement:
      while ( expression ) statement
      do statement while ( expression ) ;
      for ( expressionopt ; expressionopt ; expressionopt ) statement
      for ( declaration expressionopt ; expressionopt ) statement

Last edited by Dave Sinkula; May 20th, 2009 at 3:23 pm.

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tux4life

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Re: Need help comparing array to a string from text file.

May 20th, 2009

•

Originally Posted by Dave Sinkula

Help with Code Tags

(Toggle Plain Text)
6.8.5 Iteration statements
Syntax
   iteration-statement:
      while ( expression ) statement
      do statement while ( expression ) ;
      for ( expressionopt ; expressionopt ; expressionopt ) statement
      for ( declaration expressionopt ; expressionopt ) statement
6.8.5 Iteration statements Syntax iteration-statement: while ( expression ) statement do statement while ( expression ) ; for ( expressionopt ; expressionopt ; expressionopt ) statement for ( declaration expressionopt ; expressionopt ) statement

According to the C++ standard it's:

Help with Code Tags

(Toggle Plain Text)

6.5 Iteration Statements
iteration-statement:
    while ( condition ) statement
    do statement while ( expression ) ;
    for ( for-init-statement conditionopt ; expressionopt ) statement
for-init-statement:
    expression-statement
    simple-declaration
[ Note: a for-init-statement ends with a semicolon. —end note ]

Last edited by tux4life; May 20th, 2009 at 3:34 pm.

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kailisr

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Re: Need help comparing array to a string from text file.

May 20th, 2009

I see what you're saying, that is the format of the do loop I was looking for. That is great! Thanks. The only other thing I am having a problem with is matching up my array with the string. I am trying to use "array == string", because = is out of the question. I know I want it to say "is equal to", but that reads as a compilation error. Do you know what the correct operator would be?

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tux4life

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Re: Need help comparing array to a string from text file.

May 20th, 2009

•

Originally Posted by kailisr

I am having a problem with is matching up my array with the string. I am trying to use "array == string", because = is out of the question. I know I want it to say "is equal to", but that reads as a compilation error. Do you know what the correct operator would be?

Could you give us an example of the code you're trying to do this in?
(post the code where you have this problem with)

"Never argue with idiots, they just drag you down to their level and then beat you with experience."

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kailisr

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Re: Need help comparing array to a string from text file.

May 20th, 2009

I know that is needs to be a do..while loop. I am also not sure if the second for loop is necessary. I can find that out after I realize the first while loop. I think "==" should work, but I get "there is no acceptable conversion" error, because this is an int array and a string.

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
do
{
while (code[0] == code2[0]);
counter++;
for (counter = 0; counter < 26; counter++; )
for (counter2 = 0; counter2 < 26; counter2++; )
}
do
{
while (code[0] == code2[0]);
counter++;
for (counter = 0; counter < 26; counter++; )
for (counter2 = 0; counter2 < 26; counter2++; )
}

Last edited by Ancient Dragon; May 20th, 2009 at 8:25 pm. Reason: add code tags -- for what its worth

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kailisr

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Re: Need help comparing array to a string from text file.

May 20th, 2009

Now my other post, posts.

Last edited by kailisr; May 20th, 2009 at 5:54 pm.

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Re: Need help comparing array to a string from text file.

#10

May 20th, 2009

You cannot compare a string directly with an integer, please take a look at the following example:

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string s="1a3";
int arr[]={1,2,3};
 
for(int i=0; i<sizeof(arr)/sizeof(int); i++)
{
    if((s[i]-'0')==arr[i])
        cout << "equal" << endl;
    else
        cout << "not equal" << endl;
}
string s="1a3";
int arr[]={1,2,3};

for(int i=0; i<sizeof(arr)/sizeof(int); i++)
{
    if((s[i]-'0')==arr[i])
        cout << "equal" << endl;
    else
        cout << "not equal" << endl;
}