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POFor this selection sort, why is the first number 0 when 0 is never used in my array? (in c)
 

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  1. POFor this selection sort, why is the first number 0 when 0 is never used in my array? (in c)
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    <p>This is code called by main to sort an array using selections sort in the C language. I have a file opened in main and put the first ten ints into an array and the 11th into a variable and then a bunch of simple functions are called. The whole thing is repeated three times. For my test file, that last two iterations have the correct printed sort, but the first starts with 0, but I don't have a 0 in my array. It also drops the last int.</p> <p>Thanks in advance for all your help!!</p> <p>Here is my code:</p> <pre><code> void sortme (int arry [], int last_int) { int temp; int smallest_int; int current_int; int target_searcher; int numPrinted; for(current_int = 0; current_int &lt; last_int; current_int++) { smallest_int = current_int; for(target_searcher = current_int + 1; target_searcher &lt;= last_int; target_searcher++) if(arry[target_searcher] &lt; arry[smallest_int]) smallest_int = target_searcher; temp = arry[current_int]; arry[current_int] = arry[smallest_int]; arry[smallest_int] = temp; } //end outter loop numPrinted = 0; printf("\nThe sorted array is: "); for(current_int = 0; current_int &lt; SIZE; current_int++) { printf("%4d", arry[current_int]); if(numPrinted &lt; COUNT) numPrinted++; else { printf("\n"); numPrinted = 0; } } printf("\n"); return; } </code></pre> <p>Here is my output for reference (most of the stuff is commenetd out in main.c):</p> <pre><code>The file opened. Scanned into a[] and target is 33 ARRAY[1] The contents in the array are: 40 32 57 27 67 6 3 89 2 99 The sorted array is: 0 2 3 6 27 32 40 57 67 89 The value searched, 33, was not found. Scanned into a[] and target is 3 ARRAY[2] The contents in the array are: 86 43 89 32 45 12 1 58 98 4 The sorted array is: 1 4 12 32 43 45 58 86 89 98 The value searched, 3, was not found. Scanned into a[] and target is 11 ARRAY[3] The contents in the array are: 1 2 3 4 5 6 7 8 9 10 The sorted array is: 1 2 3 4 5 6 7 8 9 10 The value searched, 11, was not found. Closing the file. The file closed. </code></pre>
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    1. This table or related slice is empty.
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    1. USKeith Thompson
    1. USPiseagan
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    1. This table or related slice is empty.
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    1. PO
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    1. This table or related slice is empty.
    1. COHave you tried debugging it? try it with a really small array (say, only 1 entry). Step through your `for (current_int = 0; current_int < last_int; current_int++)` loop, compare the contents of the variables to what you expect to be in the variables, and then that should tip you off to why 0 is being stored as the first entry.
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      1. POFor this selection sort, why is the first number 0 when 0 is never used in my array? (in c)
      1. USRaymond Chen
    2. CO@Raymond is right: debugging and stepping into code with a debugger is absolutely **mandatory**. If you don't know how, you must learn. If you know how, and choose not to, you are wrong.
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      1. POFor this selection sort, why is the first number 0 when 0 is never used in my array? (in c)
      1. USabelenky
    3. CODebugging would be the same as adding in printf statements to help see where programs stick? We haven't gone over debugging in class (I'm very new at programming).
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      1. POFor this selection sort, why is the first number 0 when 0 is never used in my array? (in c)
      1. USPiseagan
 

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