case 3:
Complement(a,m);
that is the function call in main function
void Complement(int a[10],int m)
{
int i,k;
int c[20]={0,1,2,3,4,5,6,7,8,9};
for(i=0;i<=m;i++)
{
if(!a[] == c[])
{
printf("\n%d",c[20]);
}
}
}