C Program to identify missing Numbers in a given Array

#include < stdio.h>
 
void main()
{
    int n, i, j, c, t, b;
 
    printf("Enter size of array : " );
    scanf("%d" , &n);
    int array[n - 1];     /* array size-1 */
    printf("Enter elements into array : \n" );
    for (i = 0; i < n - 1; i++)    
        scanf("%d" , &array[i]);
    b = array[0];
    for (i = 1; i < n - 1; i++)
        b = b ^ array[i];
    for (i = 2, c = 1; i <= n; i++)
        c = c ^ i; 
    c = c ^ b;  
    printf("Missing element is : %d \n" , c);
}

Output

 Enter  size  of array :  6 
Enter elements into array : 
 1 
 2 
 3 
 5 
 6 
Missing element is :  4 

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