c - Trouble converting latitude/longtiude to DMS and back -


i've written 2 functions convert latitude , longitude , forth components degrees, minutes, , seconds. far method dectodms() goes, math seems okay positive/negative signs off on minutes , seconds.

for dmstodec, i'm barely off in calculations , i'm not quite sure error lies. here both code samples:

int dmstodec(double *deg, int degrees, int minutes, double seconds) {     //test invalid inputs     if (deg == null) {         return 1;     }     if (*deg < -180 || *deg > 180) {         return 1;     }     // formula degrees = degrees + minutes/60 + seconds/3600;     double m;     double s;     double d;        d = (double) degrees;     m = (double) minutes / 60;     s = (double) seconds / 3600;      *deg = d + m + s;     printf("dms dec %lf\n", *deg);      return 0; }  int dectodmsint *degrees, int *minutes, double *seconds, double deg) {     if (degrees == null || minutes == null || seconds == null) {         return 1;     }     if (deg < -180 || deg > 180) {         return 1;     }     *degrees = deg;     deg = deg - trunc(deg);     // multiply decimal 60;     deg *= 60;     *minutes = deg;     // drop integer     deg = deg - trunc(deg);     deg *= 60;     *seconds = deg;      return 0; }

how about:

*degrees = deg; deg = deg - trunc(deg);  // minutes , seconds >= 0 if (deg < 0)     deg *= -1;  // multiply decimal 60 deg *= 60; *minutes = deg; // drop integer deg = deg - trunc(deg); deg *= 60; *seconds = deg;

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