#include <stdio.h>


int square(int x)
{
    return x * x;
}


int main()
{
    extern int sumrange(int (*f)(int), int low, int high);
    printf("%d\n", sumrange(square, 5, 10));
    return 0;
}


int sumrange(int (*f)(int), int low, int high)
{
    int x;
    int sum = 0;
    for (x = low; x <= high; x++)
	sum += (*f)(x);
    return sum;
}