Strings.......help

**incognito** · 04-10-2002

I want to have a little thing that prompts the user to enter a frase........like
the user enters "I Love You"
and then have something that prints out something depending on the message printed by the user

if (message=="I Love You")
{
blah blah blah
}

how could I do this?

**Kohatian 3279** · 04-10-2002

well,u can use ascii values of the input string and then compare it with any switch case value or using if statement as u did,if u have specific input string choices.

**Magos** · 04-10-2002

You can't compare strings with the == operator, you must use strcmp() or something similar.

**incognito** · 04-10-2002

Originally posted by Magos
You can't compare strings with the == operator, you must use strcmp() or something similar.

Well only works when I enter one word with the == operator, how is the strcmp() used? My book doesn't have it.

**Magos** · 04-10-2002

Borland C++ 5.0 Programmer's Guide

Syntax

#include <string.h>
int strcmp(const char *s1, const char *s2);

Description

Compares one string to another.
strcmp performs an unsigned comparison of s1 to s2, starting with the first character in each string and continuing with subsequent characters until the corresponding characters differ or until the end of the strings is reached.

Return Value

If s1 is... strcmp returns a value that is...

less than s2 < 0
the same as s2 == 0
greater than s2 > 0

Simple example:

Code:

bool CompareStringWithHello(char* String)
{
   if(strcmp(String, "Hello")==0) return true;
   else return false;
}

**subdene** · 04-10-2002

try this, hope it helps.

Code:

#include <iostream.h>

int main(void)
{
  const int MAX_BUFFER=256, NUM_MSGS=2;

  const char Messages[2][20]={{"I Love you"},{"bla bla"}};

  char Buffer[MAX_BUFFER];

  cout << "Please enter something: ";
  cin.getline(Buffer,MAX_BUFFER);

  for(int i=0; i < NUM_MSGS; i++)
  {
    if(strcmp(Buffer,Messages[i])==0)
    {
      cout << "You entered: " << Buffer;
      i=NUM_MSGS; //Exit loop
    }
    else
    {
      if(i==NUM_MSGS-1)
      cout << "No match found.";
    }
  }

  getchar();
}

**incognito** · 04-10-2002

Thanks guys for your help, this seems to work

Code:

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

int main()
{


char s1[80];
cout<<"Enter something\n";
cin.get(s1, 80);




//if it's false
if ( strcmp( s1, "how are you")  )/*this seems to check if it's false for some reason*/


{//print this
   cout<<"Wrong\n";
}



else
{
    cout<<"yeah baby\n";
}


     
      return 0;
}

**incognito** · 04-10-2002

oh this is why.....

RETURN VALUES
The function strcmp() returns a positive integer if string s1 is lexically greater than string s2; zero if the two strings are identical; and a negative integer if string s1 is lexically less than string s2.

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