Three word location: Difference between revisions
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=={{header|C}}==
{{trans|Go}}
<lang c>#include <stdio.h>
#include <stdlib.h>
typedef long long int64;
void to_word(char *ws, int64 w) {
sprintf(ws, "W%05lld", w);
}
int64 from_word(char *ws) {
return atoi(++ws);
}
int main() {
double lat, lon;
int64 latlon, ilat, ilon, w1, w2, w3;
char w1s[7], w2s[7], w3s[7];
printf("Starting figures:\n");
lat = 28.3852;
lon = -81.5638;
printf(" latitude = %0.4f, longitude = %0.4f\n", lat, lon);
// convert lat and lon to positive integers
ilat = (int64)(lat*10000 + 900000);
ilon = (int64)(lon*10000 + 1800000);
// build 43 bit BigInt comprising 21 bits (lat) and 22 bits (lon)
latlon = (ilat << 22) + ilon;
// isolate relevant bits
w1 = (latlon >> 28) & 0xefff;
w2 = (latlon >> 14) & 0x7fff;
w3 = latlon & 0x7fff;
// convert to word format
to_word(w1s, w1);
to_word(w2s, w2);
to_word(w3s, w3);
// and print the results
printf("\nThree word location is:\n");
printf(" %s %s %s\n", w1s, w2s, w3s);
/* now reverse the procedure */
w1 = from_word(w1s);
w2 = from_word(w2s);
w3 = from_word(w3s);
latlon = (w1 << 28) | (w2 << 14) | w3;
ilat = latlon >> 22;
ilon = latlon & 0xfffff;
lat = (double)(ilat-900000) / 10000;
lon = (double)(ilon-1800000) / 10000;
// and print the results
printf("\nAfter reversing the procedure:\n");
printf(" latitude = %0.4f, longitude = %0.4f\n", lat, lon);
return 0;
}</lang>
{{out}}
<pre>
Starting figures:
latitude = 28.3852, longitude = -81.5638
Three word location is:
W18497 W27708 W01322
After reversing the procedure:
latitude = 28.3852, longitude = -81.5638
</pre>
=={{header|Go}}==
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