>>250
#include <stdio.h>
#include <math.h>

#define func(x) (sqrt(x)*log(x))

int main(void){
    double x, x1 = 1.0, x2 = 2.0, dx, s = 0;
    int n = 100;

    dx = (x2 - x1)/n;

    for(x = x1; x < x2; x += dx)
        s += (func(x) + func(x + dx))*dx/2;

    printf("s = %g\n", s);

    return 0;
}