chore(C): add linear search (#293)

algorithms/C/searching/linearsearch.c

@@ -0,0 +1,68 @@
+// linear search
+#include <stdio.h>
+#include <stdlib.h>
+//function prototype
+int linearSearch(int a[], int query, int size);
+
+int main()
+{
+   int *data,i,temp,searchQuery,size;
+   printf("Enter size:");
+   scanf("%d",&size);
+   data=(int*)malloc(sizeof(int)*size);
+
+   //generate some data
+   for (i = 0; i < size; ++i)
+   {
+      scanf("%d",&data[i]);
+   }
+
+   printf("Enter integer to search for: ");
+   scanf("%d", &searchQuery);
+
+   //finding searchQuery in array data
+   temp = linearSearch(data, searchQuery, size);
+
+   //condition for displaying result
+   if ( temp != -1)
+      printf("Value found at index no:%d", temp);
+   else
+      printf("Value not found");
+
+   return 0;
+}
+
+//Linear search function
+
+int linearSearch(int a[], int query, int size)
+{
+   int j; //counter variable
+
+   //loop through array
+   for (j = 0; j < size; ++j)
+   {
+      if ( a[ j ] == query)
+      {
+         return j; //return location of value
+      }
+   }
+
+   return -1; //value not found
+}
+/*
+Case 1:
+Input: Enter size: 10
+       1,2,3,4,5,6,7,8,50,10
+       Enter the data to search: 11
+Output: Data not Found
+
+Case 2:
+
+Input: Enter size: 10
+       1,2,3,4,5,6,7,8,9,10
+       Enter the data to search: 7
+Output: Data Found at index: 6
+
+Time complexity: O(n)  //where n is the size of array
+
+*/