線性搜尋範例程式（C語言）

線性搜尋範例程式，使用 C語言實現如下所示：

#include <stdio.h>

#define MAX 20

// array of items on which linear search will be conducted.
int intArray[MAX] = {1,2,3,4,6,7,9,11,12,14,15,16,17,19,33,34,43,45,55,66};

void printline(int count){
   int i;
	
   for(i = 0;i <count-1;i++){
      printf("=");
   }
   printf("=\n");
}

// this method makes a linear search. 
int find(int data){
   int comparisons = 0;
   int index = -1;
   int i;

   // navigate through all items 
   for(i = 0;i<MAX;i++){
      // count the comparisons made 
      comparisons++;
      // if data found, break the loop
		
      if(data == intArray[i]){
         index = i;
         break;
      }
   }   
   printf("Total comparisons made: %d", comparisons);
   return index;
}

void display(){
   int i;
   printf("[");
	
   // navigate through all items 
   for(i = 0;i<MAX;i++){
      printf("%d ",intArray[i]);
   }
	
   printf("]\n");
}

main(){
   printf("Input Array: ");
   display();
   printline(50);
	
   //find location of 1
   int location = find(55);

   // if element was found 
   if(location != -1)
      printf("\nElement found at location: %d" ,(location+1));
   else
      printf("Element not found.");
}

如果我們編譯並執行上述程式那麼這將產生以下結果 -

Input Array: [1 2 3 4 6 7 9 11 12 14 15 16 17 19 33 34 43 45 55 66 ]
==================================================
Total comparisons made: 19
Element found at location: 19