strcat(); function help

nirvana4lf · #1 01-Oct-2004, 12:56

i know that this is probably a noob question but wutever. i am trying to figure out how to use the strcat(); function by testing it in a program, but it doesn't work. here is my code (fyi i am using windows xp not linux although i want to use linux...):

CPP / C++ / C Code:

#include <stdio.h>
#include <stdlib.h>
#include <string>

using namespace std;



int main()
{

  string var1 = "this is string 1.";
  string var2 = "this is string 2.";

  strcat(var1, string var2);
  system("pause");

  return 0;
}

please help me. i would really appreciate it!

davekw7x · #2 01-Oct-2004, 14:51

Quote:

Originally Posted by nirvana4lf

i know that this is probably a noob question but wutever. i am trying to figure out how to use the strcat(); function by testing it in a program, but it doesn't work. here is my code (fyi i am using windows xp not linux although i want to use linux...):

please help me. i would really appreciate it!

strcat() is used with c-style strings (null-terminated array of chars).

Here's an example:

CPP / C++ / C Code:

#include <iostream>
#include <string>

using namespace std;

int main()
{
  char var1[100] = "This is string 1.";
  char var2[100] = "This is string 2.";

  cout << "var1: <" << var1 << ">" << endl;
  cout << "var2: <" << var2 << ">" << endl;

  strcat(var1, " ");
  strcat(var1, var2); // for c-style strings

  cout << "After strcat, var1: <" << var1 << ">" << endl;

  return 0;
}

With the C++ string class, concatenation of strings is performed with the "+" operator. Here's an example:

CPP / C++ / C Code:

#include <iostream>
#include <string>

using namespace std;



int main()
{

  string var1 = "this is string 1.";
  string var2 = "this is string 2.";

  cout << "Initially var1: <" << var1 << ">" << endl;
  cout << "Initially var2: <" << var2 << ">" << endl;

  var1 = var1 + " " + var2;

  cout << "After the operation, var1: <" << var1 << ">" << endl;

return 0;
}

With c-style strings, you must allocate enough storage to hold the largest string that you will ever store in that array.

With the C++ string class, strings are automatically re-sized as you perform operations.

Regards,

Dave

nirvana4lf · #3 01-Oct-2004, 16:05

Quote:

Originally Posted by davekw7x

strcat() is used with c-style strings (null-terminated array of chars).

Here's an example:

CPP / C++ / C Code:

#include <iostream>
#include <string>

using namespace std;

int main()
{
  char var1[100] = "This is string 1.";
  char var2[100] = "This is string 2.";

  cout << "var1: <" << var1 << ">" << endl;
  cout << "var2: <" << var2 << ">" << endl;

  strcat(var1, " ");
  strcat(var1, var2); // for c-style strings

  cout << "After strcat, var1: <" << var1 << ">" << endl;

  return 0;
}

With the C++ string class, concatenation of strings is performed with the "+" operator. Here's an example:

CPP / C++ / C Code:

#include <iostream>
#include <string>

using namespace std;



int main()
{

  string var1 = "this is string 1.";
  string var2 = "this is string 2.";

  cout << "Initially var1: <" << var1 << ">" << endl;
  cout << "Initially var2: <" << var2 << ">" << endl;

  var1 = var1 + " " + var2;

  cout << "After the operation, var1: <" << var1 << ">" << endl;

return 0;
}

With c-style strings, you must allocate enough storage to hold the largest string that you will ever store in that array.

With the C++ string class, strings are automatically re-sized as you perform operations.

Regards,

Dave

thank you dave!

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