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Simple question

 
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Simple question, testing string values
Oats
7 Jun, 2007 - 12:55 PM
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Just a simple question that I've been looking for the answer to for a few days, but I figured after awhile that it'd be easier to do it here.
I know that you can use scanf to store numbers and whatnot, as well as using it for if/then statements, but how do you do it with words and stuff? (The question didn't really make sense because I can't think of a good way to word it, so sorry.) Here's what I mean, sort of:
CODE
char something[20];
    
    printf("stuff? ");
    scanf("%s", something);

That's how I was doing it, but if you were to do if (something==toast), it doesn't work correctly. (This isn't from an actual program, so I just put in randomness since I'm kind of lazy.) If there is an easy way to do this, I'd appreciate some help.
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ZlxA
RE: Simple Question
7 Jun, 2007 - 01:21 PM
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QUOTE(Oats @ 7 Jun, 2007 - 01:55 PM) *

Just a simple question that I've been looking for the answer to for a few days, but I figured after awhile that it'd be easier to do it here.
I know that you can use scanf to store numbers and whatnot, as well as using it for if/then statements, but how do you do it with words and stuff? (The question didn't really make sense because I can't think of a good way to word it, so sorry.) Here's what I mean, sort of:
CODE
char something[20];
    
    printf("stuff? ");
    scanf("%s", something);

That's how I was doing it, but if you were to do if (something==toast), it doesn't work correctly. (This isn't from an actual program, so I just put in randomness since I'm kind of lazy.) If there is an easy way to do this, I'd appreciate some help.


if(something == "toast"), you need the quotes around the string you want to test it to, otherwise it takes it as toast being a variable name.
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salindor
RE: Simple Question
7 Jun, 2007 - 02:44 PM
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QUOTE(ZlxA @ 7 Jun, 2007 - 02:21 PM) *

QUOTE(Oats @ 7 Jun, 2007 - 01:55 PM) *

Just a simple question that I've been looking for the answer to for a few days, but I figured after awhile that it'd be easier to do it here.
I know that you can use scanf to store numbers and whatnot, as well as using it for if/then statements, but how do you do it with words and stuff? (The question didn't really make sense because I can't think of a good way to word it, so sorry.) Here's what I mean, sort of:
CODE
char something[20];
    
    printf("stuff? ");
    scanf("%s", something);

That's how I was doing it, but if you were to do if (something==toast), it doesn't work correctly. (This isn't from an actual program, so I just put in randomness since I'm kind of lazy.) If there is an easy way to do this, I'd appreciate some help.


if(something == "toast"), you need the quotes around the string you want to test it to, otherwise it takes it as toast being a variable name.


Just becareful with the above snippet. I know personally hackers look for code that looks like that, and will perform a buffer overrun by placing entering say a 40 character string instead of a 20 character string.

The above is really only good for test projects that will never see the light of day, but if your doing anything that could possibly be seen by anyone else, you really want to avoid using scanf.

Salindor
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Amadeus
RE: Simple Question
7 Jun, 2007 - 03:20 PM
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g++ -o drink whiskey.cpp
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In any case, you cannot use the equality operator with a character array. To compare c style strings, you'll need to use the strcmp() function:

http://www.cplusplus.com/reference/clibrar...ing/strcmp.html

The equality operator can be used with the C++ string object.
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Oats
RE: Simple Question
8 Jun, 2007 - 06:58 PM
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Hmm, I've tried plenty of times but I can't find a way to make it so that if szInput is equal to szKey it does one thing, but if not it says something different. I'm not sure there's a way to do it with the method in the link, but I've been trying and can't seem to get anything dry.gif
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no2pencil
RE: Simple Question
8 Jun, 2007 - 08:23 PM
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CODE

#include <stdio.h>

#define MAX 20

int main(void) {
    char buff[MAX];
    
    printf("Please enter some words:");
    scanf("%s", &buff);
    
    printf("%s",buff);
    return 0;
}

But like it was pointed out, you want to run a check while gathering the text that it does not go over the pre-defined amount. When I perform this, I will read in one char at a time while checking the current possition in the array.

Good luck!
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Amadeus
RE: Simple Question
9 Jun, 2007 - 10:53 AM
Post #7

g++ -o drink whiskey.cpp
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QUOTE(Oats @ 8 Jun, 2007 - 10:58 PM) *

Hmm, I've tried plenty of times but I can't find a way to make it so that if szInput is equal to szKey it does one thing, but if not it says something different. I'm not sure there's a way to do it with the method in the link, but I've been trying and can't seem to get anything dry.gif

Can you post the code your having problems with?
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