CODEWITHSUNDEEP
cpointerschar
Jacob Jones
Jacob Jones

Reputation: 501

C char[] and *char

I have an issue with C strings. I have array char char_array[256] = {0}.

I had fulfilled this array with char elements. When I print these elements printf("%c", char_array[0]);, printf("%c", char_array[1]); and etc, the values are correct. But when I try to print printf("%s", char_array);, it prints nothing...

Also I have function void function(char* char_pointer). I am trying to return data strcpy(char_pointer, char_array). But it returns nothing...

Please, help me, how to return data from function, that later, outside function, I could print printf("%s", char_pointer_from_function)?

UPDATE:

Function:

void unmarshal_packet(char *packet)
{
    char packet_size_string [10] = {0};
    char unmarshaled_data [2000] = {0};
    int counter = 0;

    while (packet[counter] != ':' && counter < strlen(packet))
    {
        packet_size_string[counter] = packet[counter];
        counter++;
    }

    counter = strlen(packet_size_string) + 1;

    for (counter; counter < strlen(packet); counter++)
    {
        if ((packet[counter] != '\r') && (packet[counter] != '\n'))
        {
            unmarshaled_data[counter - (strlen(packet_size_string) + 1)] = packet[counter];
        }
    }

    // printf("%c", unmarshaled_data[0]);
    // printf("%c", unmarshaled_data[1]);
    // printf("%c", unmarshaled_data[2]);
    // printf("%c", unmarshaled_data[3]);
    // printf("%c", unmarshaled_data[4]);
    // printf("%c", unmarshaled_data[5]);
    // printf("%c", unmarshaled_data[6]);
    // printf("%c", unmarshaled_data[7]);
    // printf("%c", unmarshaled_data[8]);
    // printf("%c", unmarshaled_data[9]);

    printf("%s", unmarshaled_data);

    unmarshaled_data[counter - (strlen(packet_size_string) + 1)] = '\0';

    strcpy(packet, unmarshaled_data); 
}

Function call:

strcpy(buffer, " \nWellcome to Yes / No game server! \n");
unmarshal_packet(buffer);

Upvotes: 0

Views: 109

Answers (1)

Scott Hunter
Scott Hunter

Reputation: 49805

Strings are sequences of non-NULL (ASCII value 0) characters, followed by such a character indicating the end of the string. If, for example, your first character where a NULL, that would represent an empty string, and so nothing would be printed. Not knowing what you put in your array before printing, I cannot say what should be printed.

Upvotes: 1

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