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

#define V(x) {x, #x}

struct constant {
    double value;
    const char * name;
} 
constants[] = {
    V (M_E),
    V (M_LOG2E),
    V (M_LOG10E),
    V (M_LN2),
    V (M_LN10),
    V (M_PI),
    V (M_PI_2),
    V (M_PI_4),
    V (M_1_PI),
    V (M_2_PI),
    V (M_2_SQRTPI),
    V (M_SQRT2),
    V (M_SQRT1_2),
    V (HUGE),
    V (MAXFLOAT),
    V (HUGE_VAL),
};

int n_constants = sizeof (constants) / sizeof (struct constant);

int main ()
{

    int i;

    for (i = 0; i < n_constants; i++) {
        printf ("%s: %g\n", constants[i].name, constants[i].value);
    }

    return 0;
}