Thread: Trouble passing information from one function to another function

  1. #1
    Registered User
    Join Date
    Aug 2007

    Trouble passing information from one function to another function

    I'm trying to pass values from the main() function to the selectionSort() function, but it keeps saying the following:

    hw2n1.c: In function `main':
    hw2n1.c:25: warning: passing arg 1 of `selectionSort' makes pointer from integer without a cast
    hw2n1.c:25: error: void value not ignored as it ought to be

    The following is my code:

    #include <stdio.h>
    #define NUM_INT 1000
    void selectionSort(int a[], int size);
    int main (void)
      int input[NUM_INT] = {0};
      int i;
      int sorted;
      printf("please input arrays of ints to be sorted ");
      for (i = 0; i < NUM_INT; i++)
        scanf("&#37;d", &input[i]);
        printf("%d ", input[i]);  //TESTING
        if (input[i] < -2)
          printf("program error (one of the numbers is less than -2)\n ");
          return 0;
        if(input[i] == -1)
           printf("restart sort and new line");
           sorted = selectionSort(input[i], NUM_INT);   //TROUBLE SPOT, DON'T KNOW WHAT TO DO!
        if (input[i] == -2)
          printf("Inputed Arrays are: %d", input[i]);
     // printf("Inputed Arrays are: %d", input[i]);
      printf("sorted is: %d", sorted);
      return 0;
    void selectionSort(int a[], int size)
      int i, j, min;
      for (i = 0; i < size - 1; i++)
        min = i;
        for (j = i+1; j < size; j++)
           if (a[j] < a[min])
              min = j;
        swap(a[i], a[min]);

  2. #2
    Fear the Reaper...
    Join Date
    Aug 2005
    Toronto, Ontario, Canada
    625 may want to send your function the whole array instead of a single element in that array.
    Teacher: "You connect with Internet Explorer, but what is your browser? You know, Yahoo, Webcrawler...?" It's great to see the educational system moving in the right direction

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