Modify barcode. c (attached, Project 4, #2), the edge detection function using p

Question

Modify barcode. c (attached, Project 4, #2), the edge detection function using pointer arithmetic. The function prototype should be the following. Name your program barcode2.c. void edge(int n, int *al, int *a2); The function should use pointer arithmetic - not subscripting - to visit array elements. In other words, eliminate the loop index variables and all use of the [] operator in the function. *This program finds the edges of light and dark regions of the *input binary bit pattern. #include void edge(int n, int a[], int b[]); int main(void) { int input[8]={0}; int output[8]; int i; printf("please enter the 8 bit bar code"); for(i=0;i

Explanation / Answer

#include <stdio.h>

void edge(int n, int *a, int *b);

int main(void) {
   int input[8] = {0};
   int output[8];

   printf("please enter the 8 bit bar code");
   int count = 0;
   while (count != 8) {
       scanf("%1d", input + count);
       ++count;
   }

   edge(8, input, output);

   count = 0;
   while (count != 8) {
       printf("%d", *(output + count));
       count++;
   }

   return 0;
}

void edge(int n, int *a, int *b) {
   *b = 0;
   ++a;
   int count = 8;
   while (count--) {
       if (*a == *(a - 1))
           *b = 0;
       else
           *b = 1;
       ++a;
       ++b;
   }
}

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