is there a way to truncate an array

i was wondering how i might be able to empty out the first 5 elements of an array with 10 things in it?

thank you

Code:

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int a[10];
int i;
for(i=0;i<5;i++)
a[i]=a[i+5];

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will copy the next 5 elements to the first five.
In this type of situation.where you have to remove the first elements you can implement a queue also.