Compare a string with another string inside an array

Question

Good afternoon,

I'm currently working on an assignment with a custom programming environment using a sublanguage of c++ that lacks some of it's features.

I have written this code:

char comparameEsto(char voy, char vengo, pueblo sitios1, pueblo sitios2, pueblo sitios3,pueblo sitios4){
    bool  encontradoOrigen;
    bool encontradoDestino;
    char copia;
    for(int i=0; i<13;i++){
        strcpy(copia,sitios1[i]);
    }
}

char comparameEsto(char voy, char vengo, pueblo sitios1, pueblo sitios2, pueblo sitios3,pueblo sitios4){
    bool  encontradoOrigen;
    bool encontradoDestino;
    char copia;
    for(int i=0; i<13;i++){
        strcmp(voy,sitios1[i]);
    }
}

It's just an example of the functionality I'm looking for. The thing is, I want to copy the String inside sitios1 to copia, or compare them with voy and vengo, but it keeps telling me this:

invalid conversion from `char' to `char*'

I'm not very fluent in C++ (I'm more used to Java), and I'm having a really hard time understanding what should I do.

We could help you more if you could explain us what are your function's arguments. — cocool97
– cocool97, Commented Aug 30, 2020 at 17:32
Hello, I'm sorry I wasn't expecting such a quick answer. @Barmar "pueblo" is a typedef I used to store different Strings, "typedef char pueblo[][30];" I use it to print the parallel value that's stored on an enum, since I can't print from the enum. And yes, I can use string.h in this sublanguage. — ViniV
– ViniV, Commented Aug 30, 2020 at 18:51

Barmar · Accepted Answer · 2020-08-30 19:13:58Z

1

char copia declares just a single character. To declare a string, you have to create an array.

    #define MAX_STRING_SIZE 30

    char copia[MAX_STRING_SIZE];

    for(int i=0; i<13;i++){
        strcpy(copia,sitios1[i]);
    }

answered Aug 30, 2020 at 19:13

Barmar

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1 Comment

ViniV Over a year ago

Many thanks Barmar! I was trying a similar approach in the wrong way, I was trying to directly compare two array using strcmp not realising that I would need to declare a matrix to do it, instead of going for a one dimension array that would allow me to use strcpy. Now I have two ways to procede, one would be to compare copia with another parameter defined by the user and turn a boolean true if it was the same, or directly use strcmp to compare the input(Wich would be stored in char voy[1][20] for example) with the content inside the array. Again, many thanks for the insight.

cocool97 · Accepted Answer · 2020-08-30 17:30:45Z

1

char is just a single character in C (or C++) language, as it would be in other languages like Java.
The main difference between a char and a char * is that a char * is a pointer to a char, meaning like a string to simplify.

answered Aug 30, 2020 at 17:30

cocool97

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Comments

anatolyg · Accepted Answer · 2020-08-30 18:00:15Z

1

As the other answer says, char is a single character, while char* is a pointer to a character (typically, the first character in a string).

String functions like strcmp receive strings, that is, pointers. Trying to send char to a function which receives char* is an error.

To work with single characters, use built-in operators:

To copy - use the assignment operator: copia = sitios1[i]
To compare - use the comparison operator: voy == sitios1[i]

answered Aug 30, 2020 at 18:00

anatolyg

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1 Comment

ViniV Over a year ago

The problem is that I need to compare the whole String stored inside sitios1[] with the ones I recieve from "voy" and "vengo", not just a single character, and the book I have barely adress how to do it. Should I make a typedef char voy[15] and typedef char vengo[15] and work with that?

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