parsing char array

This is a discussion on parsing char array within the C Programming forums, part of the General Programming Boards category; hello, I have a char array I would like to parse though but I'm getting hung up. can anyone help? ...

  1. #1
    Registered User
    Join Date
    Dec 2008
    Posts
    4

    parsing char array

    hello,

    I have a char array I would like to parse though but I'm getting hung up. can anyone help? Thanks in advance.

    Code:
    
    char * commands [2] = {"open", "close"};
    
    char **i = commands;
    
    while(*i){
    printf("%s\n",*i);
    i++;
    }
    Basically I think I'm reading past the end of the char array but not 100% sure how to correct.

  2. #2
    Registered User Codeplug's Avatar
    Join Date
    Mar 2003
    Posts
    4,673
    Your loop condition requires that the last string pointer in the array be a 0.
    Code:
        char *commands[] = {"open", "close", 0};
        char **i = commands;
        for (; *i; ++i)
            printf("%s\n", *i);
    Your end-of-array indicator could also be an empty string - which would require one more dereference in the loop condition:
    Code:
        char *commands[] = {"open", "close", ""};
        char **i = commands;
        for (; **i; ++i)
            printf("%s\n", *i);
    Or you could just count the number of elements in the array and index directly:
    Code:
        char *commands[] = {"open", "close"};
        size_t cmd_sz = sizeof(commands) / sizeof(*commands);
        size_t n;
        for (n = 0; n < cmd_sz; ++n)
            printf("%s\n", commands[n]);
    gg

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