Jan 2, 2012

K & R C Programs Exercise 3-1.

K and R C, Solution to Exercise 3-1:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
C Program to implement binary Search. Binary search technique is simple searching technique which can be applied if the items to be compared are either in ascending order or descending order. The general idea used in binary search is similar to the way we search for the telephone number of a person in the telephone directory. Binary search is the divide and conquer strategy. Read more about C Programming Language .

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/*C Program for Binary search */

#include<stdio.h>
int main() {

 int n, a[30], item, i, j, mid, top, bottom;
 printf("Enter how many elements you want:\n");
 scanf("%d", &n);
 printf("Enter the %d elements in ascending order\n", n);
 for (i = 0; i < n; i++) {
  scanf("%d", &a[i]);
 }
 printf("\nEnter the item to  search\n");
 scanf("%d", &item);
 bottom = 1;
 top = n;

 do {
  mid = (bottom + top) / 2;
  if (item < a[mid])
   top = mid - 1;
  else if (item > a[mid])
   bottom = mid + 1;
 } while (item != a[mid] && bottom <= top);

 if (item == a[mid]) {
  printf("Binary search successfull!!\n");
  printf("\n %d found in position: %d\n", item, mid + 1);
 } else {
  printf("\n  Search failed\n %d not found\n", item);
 }
 return 0;
}
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