Command-line argument echoing in reverse

This is a discussion on Command-line argument echoing in reverse within the C Programming forums, part of the General Programming Boards category; I am trying to echo the command line arguments. An example would be if you the user entered "a.out null ...

  1. #1
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    Command-line argument echoing in reverse

    I am trying to echo the command line arguments. An example would be if you the user entered "a.out null and void" then it would echo back "void and null."

    I have a program written to echo back exactly what the user enters but I can't think of a way to make it do it in reverse order. Here's the code I have:

    Code:
    int main(int argc, char *argv[])
       {
           int i;
    
           for (i = 1; i < argc; i++)
               printf("%s%s", argv[i], (i < argc-1) ? " " : "");
           printf("\n");
           return 0;
       }

  2. #2
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    Code:
    #include <stdio.h>
    
    int main(int argc, char *argv[])
    {
        while (argc-- > 0)
            printf("%s ", argv[argc]);
        return 0;
    }

  3. #3
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    k, thanks for the help.

  4. #4
    cwr
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    You could also just reverse your for loop (initialise i to argc-1, count down to 1, subtract 1 from i each iteration).

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