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  1. Replies
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    @christop, Obviously it's undefined behavior....

    @christop, Obviously it's undefined behavior. That's not the point. And I have no problem with printf printing "(null)". The point is how does the printf get called at all? Why doesn't it blow up as...
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    Dereferencing mystery?

    I find it strange that NULL is passed to printf below. Since p is NULL, it seems more likely that p->s would blow up before the function call.


    #include <stdio.h>

    typedef struct {
    char...
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    210

    Your input file is text, not binary. If you need...

    Your input file is text, not binary.
    If you need your output to be binary, what exactly is the format?
    I've output to a text file below, one integer per line.
    Never say ios::in for an ifstream or...
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    ` 2 3 5 ...

    ` 2 3 5 7 11 13 17 19 23 29 31 37 41
    1: 1 1
    2: 2 2 1
    3: 4 ...
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    ` Prime Factors Ord ...

    ` Prime Factors
    Ord Value Divs 2 3 5 7 11 13 17 19
    1: 1 1
    2: 2 2 1
    3: 4 3 2
    4: 6 4 1...
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    You don't know what you're talking about. It...

    You don't know what you're talking about.
    It makes perfect sense.
    Of course it should be "allowed".
  7. Replies
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    65525, actually, but yes, wraparound is...

    65525, actually, but yes, wraparound is well-defined with unsigned values.


    #include <stdio.h>
    #include <stdint.h>

    int main()
    {
    uint16_t n = (uint16_t)(-1); // -1 interpreted as...
  8. As usual, I don't understand what you are trying...

    As usual, I don't understand what you are trying to do. The code doesn't make sense to me and you've never really been able to explain what in the world you are trying to do overall. I'm lost. It's...
  9. I didn't test it and forgot some closing...

    I didn't test it and forgot some closing double-quotes.
    But you put them in the wrong place.
    Note that you should probably use _pclose to close a FILE* opened with _popen.


    FILE* dns =...
  10. It may have been overly-complicated (showing two...

    It may have been overly-complicated (showing two different ways and using inttypes).
    How about this.


    #include <stdio.h>
    #include <string.h>

    int main()
    {
    FILE *in = fopen("input.txt",...
  11. #include #include #include...

    #include <stdio.h>
    #include <string.h>
    #include <inttypes.h>

    #define FRM_SCN "%" SCNu32 ".%" SCNu32 ".%" SCNu32 ".%" SCNu32
    #define FRM_PRI "%" PRIu32 ".%" PRIu32 ".%" PRIu32 ".%" PRIu32
    ...
  12. I didn't realize that the input was restricted to...

    I didn't realize that the input was restricted to 0 to 10.
    In that case it will sort of work, but it's an incredibly stupid idea.
  13. You really need to improve your spacing. You...

    You really need to improve your spacing.

    You seem to be trying to return the fib through the program's exit status.
    That's not going to work.


    #include <stdio.h>
    #include <stdlib.h>...
  14. Replies
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    I wouldn't put it quite like that. But if a...

    I wouldn't put it quite like that.
    But if a calculation can be done at compile time then that's when it will usually be done (at least with optimizations).
    So if you say printf("%d\n", 2 * 3 * 4)...
  15. The return value from main is different from...

    The return value from main is different from return values from other functions.
    Main's return value is called the program's "exit status".
    It is non-portable to use this value for anything but...
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    There should be no difference in this case since...

    There should be no difference in this case since 'sizeof(struct _menu_item)' is constant, so nothing needs to be "calculated" at run-time since it's done at compile time.
  17. So what should we enter for "size" and...

    So what should we enter for "size" and "seconds"???

    And look at lines 168 and 169 above.
    Array indices start at 0, and the max index for a 3-element array is 2.
  18. Replies
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    That's because the first discrepancy in the two...

    That's because the first discrepancy in the two strings is between the last '1' of the first string and the terminating '\0' of the second string, the difference of their ascii codes being 49 since...
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    Jim has made a rare error here, simply comparing...

    Jim has made a rare error here, simply comparing the addresses of the string literals and not their "values":


    std::cout << "Are the strings equal: " << std::boolalpha << ("1 222 111" == "1...
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    It's a meaningless question since you haven't...

    It's a meaningless question since you haven't told us what your command line parameters were.
  21. Replies
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    Note that there is an error in the last part of...

    Note that there is an error in the last part of the code you've quoted. I fixed it in the original (it should've used strlen instead of sizeof since Delim is just a pointer).
    BTW, you don't need to...
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    So maybe something like this then: int...

    So maybe something like this then:


    int get_response_time(const char *ip)
    {
    char cmd[64];
    printf("Pinging %s...\n", ip);
    sprintf(cmd, "./ping %s", ip);
    int ms = -1;
    FILE...
  23. Replies
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    If the numbers you want to compare are in strings...

    If the numbers you want to compare are in strings like these:


    char s[] = "Media = 234ms";
    char t[] = "Media = 99ms";

    Then comparing with strcmp will show t as being greater than s...
  24. Replies
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    You might be able to do something like this. The...

    You might be able to do something like this. The %*[^0-9] scanf format spec will skip and discard non-digits. %d will then read the integer starting at that point.


    #include <stdio.h>

    int...
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    To compare strings you need to use strcmp. ...

    To compare strings you need to use strcmp.


    int result = strcmp(target, target2));
    if (result < 0) printf("DNS1 better\n");
    else if (result > 0) printf("DNS2 better\n");
    else ...
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