[Proj] Convertion Lat/Long WGS84 -> UTM-WGS84 problem?

[Charles Clercq]

Dear all,

I have written a simple basic code inspired from the doc to convert data in
lat/long WGS84 in meters (UTM/WGS84)
My problem is that when I tested it with lat: 51.0242 / long: 3.96338 and
obtained  x: 7627600.282316 / y: 742130.588781 which I compared with online
converter which gave me : 5652958 / 567564

I would like to understand the error. I that because proj can't convert
from WGS84 lat/long to UTM WGS84 ?

I tested with command line:
echo 51.0242 3.96338 | cs2cs.exe +proj=latlong +ellps=WGS84 +to +proj=utm
+ellps=WGS84 +datum=WGS84 +units=m
and obtained the exact same result.

Any advice?

Thanks

Clercq

The code
***********************************************************************************************************
#include <iostream>

#include <proj_api.h>

int _tmain(int argc, _TCHAR* argv[])
{
projPJ pj_merc, pj_latlong;
    double x, y;

    if (!(pj_merc = pj_init_plus("+proj=utm +ellps=WGS84 +datum=WGS84
+units=m")) )
        exit(1);
    if (!(pj_latlong = pj_init_plus("+proj=latlong +ellps=WGS84")) )
        exit(1);
std::cout << "Lat: ";
double latitude;
std::cin >> latitude;
std::cout << std::endl;
std::cout << "Long: ";
double longitude;
std::cin >> longitude;

    x = latitude*DEG_TO_RAD;
y = longitude*DEG_TO_RAD;

    int p = pj_transform(pj_latlong, pj_merc, 1, 1, &x, &y, NULL );

//std::cout << "The coordinate in meters are: " << x << "/" << y <<
std::endl;
printf("Lat/Long: %f/%f - in meters ->: %f/%f\n", latitude, longitude, x,
y);

return 0;
}
***********************************************************************************************************
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