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#include <stdlib.h>
#include <stdio.h>
static double square(double x)
{
return x * x;
}
static double integr(double (*f)(double), double low, double high, int n)
{
double h, x, s;
int i;
h = (high - low) / n;
s = 0;
for (i = n, x = low; i > 0; i--, x += h) s += f(x);
return s * h;
}
double test(int n)
{
return integr(square, 0.0, 1.0, n);
}
int main(int argc, char ** argv)
{
int n; double r;
if (argc >= 2) n = atoi(argv[1]); else n = 10000000;
r = test(n);
printf("integr(square, 0.0, 1.0, %d) = %g\n", n, r);
return 0;
}
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