simulate awk function

#include <stdio.h>
#define TOP 20
int main()
{
        int c, i, arr[TOP];
        i = 0;
        for(i = 0;i < TOP;i++)
                arr[i] = 0;
        while((c = getchar()) != EOF)
        {
                arr[i++] = c;
                putchar(arr[i-1]);
        }
        return 0;
}