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Sorting this in C language.

This is a discussion on Sorting this in C language. within the C Programming forums, part of the General Programming Boards category; hi, im new to C and wondering how i would be able to sort certain data so it goes from ...

  1. #1
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    Sorting this in C language.

    hi, im new to C and wondering how i would be able to sort certain data so it goes from highest to lowest. such as :

    9 8 7 6 5 when inputted using a compiler.

    what would be the best way and how would i do it using source code?

    If someone wil be able to help, let me know and ill send my code !

    Many thanks! MF
    Last edited by MF1991; 01-26-2013 at 05:59 PM.

  2. #2
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    The standard way in C is to use the qsort function. To sort from highest to lowest you would do it something like this

    Code:
    int int_compar_desc(const void *a, const void *b) {
        const int *ia = a;
        const int *ib = b;
        if (*ia > *ib)
            return -1;
        return (*ia < *ib);
    }
    
    int main()
    {
        int data[8] = {20, 1, 23, 4, 54, 23, 24, 97};
        qsort(data, 8, sizeof *data, int_compar_desc);
        return 0;
    }

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    what about using bubblesort? and what about if you have letters value? can i send u an example of my code in a private message?

  4. #4
    Algorithm Dissector iMalc's Avatar
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    You need to learn what a compiler is, and what it does, first by the sounds of it. Presumably you intend to use scanf or fgets to get the values from the user?
    Then you'd use the function called qsort, searching the web for how to use it.
    Finally, you'd post your attempt at this here, for everyone to see.
    Last edited by iMalc; 01-26-2013 at 06:11 PM.
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    If your input is letters, then you modify the compar function to compare letters. It is basically the same as for numbers, but you have to decide whether 'A' and 'a' are the same, etc.

  6. #6
    Algorithm Dissector iMalc's Avatar
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    Other duplicates of this thread:
    URGENTLY need help!
    Sorting C Language
    My homepage
    Advice: Take only as directed - If symptoms persist, please see your debugger

    Linus Torvalds: "But it clearly is the only right way. The fact that everybody else does it some other way only means that they are wrong"

  7. #7
    and the hat of wrongness Salem's Avatar
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    > If someone wil be able to help, let me know and ill send my code !
    Yes, post it here, and lots of people will be able to help you.

    > what about using bubblesort?
    Sure, it's good enough on small arrays.

    > and what about if you have letters value?
    'a' < 'b' works too.

    > can i send u an example of my code in a private message?
    No - post it here.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  8. #8
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    So sorry people, im new to this forum!

    this is my code, i hope you will be able to help!

    #include <stdio.h> #include <stdlib.h> #include <string.h> typedef struct - Pastebin.com

  9. #9
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    Link is in the above reply (: i really need help on this.

  10. #10
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    It seems incomplete. Can't you post the code here? Use the code tag and paste it inbetween them

  11. #11
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    Code:
    1. #include <stdio.h>
    2. #include <stdlib.h>
    3. #include <string.h>
    4. typedef struct {
    5. char* shortValue;
    6. char shortSuit[1];
    7. char value[20];
    8. char suit[20];
    9. } CARD;
    10. CARD cards[5];
    11. int score;
    12. int failed;
    13. int main(void){
    14. /* Putting space between the lines makes it look "Tidy" or "Professional" */
    15. printf("Welcome to Poker Game.\n\n");
    16. printf("Lets Start.\n\n");
    17. printf("Draw Your Cards.\n\n");
    18. for(int i = 0; i < 5; i++){
    19. cards[i].shortValue = calloc(1, sizeof(char));
    20. }
    21. scanf("%c%c %c%c %c%c %c%c %c%c", cards[0].shortValue, cards[0].shortSuit, cards[1].shortValue, cards[1].shortSuit, cards[2].shortValue, cards[2].shortSuit, cards[3].shortValue, cards[3].shortSuit, cards[4].shortValue, cards[4].shortSuit);
    22. /* Use of switch command for long if statement */
    23. /* Use value of 0 as Ten */
    24. /* For each card in input, run check to determine number/letter in word form */
    25. for(int i = 0; i < 5; i++){
    26. switch(cards[i].shortValue[0])
    27. {
    28. case '2':
    29. sprintf(cards[i].value, "Two");
    30. break;
    31. case '3':
    32. sprintf(cards[i].value, "Three");
    33. break;
    34. case '4':
    35. sprintf(cards[i].value, "Four");
    36. break;
    37. case '5':
    38. sprintf(cards[i].value, "Five");
    39. break;
    40. case '6':
    41. sprintf(cards[i].value, "Six");
    42. break;
    43. case '7':
    44. sprintf(cards[i].value, "Seven");
    45. break;
    46. case '8':
    47. sprintf(cards[i].value, "Eight");
    48. break;
    49. case '9':
    50. sprintf(cards[i].value, "Nine");
    51. break;
    52. case '0':
    53. sprintf(cards[i].value, "Ten");
    54. break;
    55. case 'J':
    56. sprintf(cards[i].value, "Jack");
    57. cards[i].value[5] = "11";
    58. score += 1;
    59. break;
    60. case 'Q':
    61. sprintf(cards[i].value, "Queen");
    62. cards[i].value[5] = "12";
    63. score += 1;
    64. break;
    65. case 'K':
    66. sprintf(cards[i].value, "King");
    67. cards[i].value[5] = "13";
    68. score += 1;
    69. break;
    70. case 'A':
    71. sprintf(cards[i].value, "Ace");
    72. cards[i].value[5] = "14";
    73. score += 1;
    74. break;
    75. default:
    76. printf("Invalid value character for card #%d. \n", i+1);
    77. failed = 1;
    78. break;
    79. }
    80. }
    81. /* Run check for all short suits in input */
    82. for(int i = 0; i < 5; i++)
    83. {
    84. switch(cards[i].shortSuit[0])
    85. {
    86. case 'C':
    87. sprintf(cards[i].suit, "Clubs");
    88. break;
    89. case 'D':
    90. sprintf(cards[i].suit, "Diamonds");
    91. break;
    92. case 'H':
    93. sprintf(cards[i].suit, "Hearts");
    94. break;
    95. case 'S':
    96. sprintf(cards[i].suit, "Spades");
    97. break;
    98. default:
    99. printf("Invalid suit character for card #%d.\n", i+1);
    100. failed = 1;
    101. break;
    102. }
    103. }
    104. if(failed == 1){
    105. printf("Invalid value or suit character. Program exiting.\n");
    106. return 0;
    107. }
    108. for(int i = 0; i < 5; i++)
    109. printf("%s of %s\n", cards[i].value, cards[i].suit);
    110. printf("\n"); }

  12. #12
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    This line is not correct:

    Code:
    sprintf(cards[i].value, "Queen");
               cards[i].value[5] = "12";
    You have a few more where you do something similar. What are you trying to do here? You store "Queen" into the character buffer `value' and then you want to tack on a "12" at the end?? I think it would make more sense to make a different member of your struct and then do something like this

    Code:
    sprintf(cards[i].value, "Queen");
    cards[i].valueAmount = 12;

  13. #13
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    i have a 5 card input like 5H 6D 8C 7S 4H and when i put them in, i want it to sort them in a list like this:

    4H
    5H
    6D
    7S
    8C

    but when i display them, it will print the names and of and then the suit. i want to be able to sort the data in order to make it go in order Highest value first to the lowest value

  14. #14
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    Fix the errors in your code first. I mentioned it above. Fixing errors should be a prerequisite to adding anything more to the code.

  15. #15
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    well i tried doing that but i kept getting error messages. do u have teamviewer 8 so i can possibly show you what i am doing so you can provide me with an answer and see for yourself?

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