C Program to Read an Array and Search for an Element

#include < stdio.h>
 
void main()
{
    int array[20];
    int i, low, mid, high, key, size;
 
    printf("Enter the size of an array\n" );
    scanf("%d" , &size);
    printf("Enter the array elements\n" );
    for (i = 0; i < size; i++)
    {
        scanf("%d" , &array[i]);
    }
    printf("Enter the key\n" );
    scanf("%d" , &key);
    /*  search begins */
    low = 0;
    high = (size - 1);
    while (low <= high)
    {
        mid = (low + high) / 2;
        if (key == array[mid])
        {
            printf("SUCCESSFUL SEARCH\n" );
            return;
        }
        if (key < array[mid])
            high = mid - 1;
        else
            low = mid + 1;
    }
    printf("UNSUCCESSFUL SEARCH\n" );
}

Output

 Enter the  size  of an array
 4 
Enter the array elements
 90 
 560 
 300 
 390 
Enter the key
 90 
SUCCESSFUL SEARCH
 
   
Enter the  size  of an array
 4 
Enter the array elements
 100 
 500 
 580 
 470 
Enter the key
 300 
UNSUCCESSFUL SEARCH

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