#include <stdio.h>
#define DELTA 0.01
static float test_func(float x){
	return x*x;
}

static float integrate(float (*func)(float),float ll, float ul){
	float set, result;
	result=0;
	for(set=ul;set>=ll;set-=DELTA){
		result+=(*func)(set)*DELTA;
	}
	return result;
}

//static float (*func)(float) = test_func;
int main(int argc, char **argv){
	float test;
	test = integrate(test_func,1,4);
	printf("ans=%f\n",test);
	return 0;
}