#include <stdio.h>
#include <string.h>

struct dialing_code{
   char *country;
   int code;
};

const struct dialing_code country_codes[] =
 { {"Argentina",          54},  {"Bangladesh",   880},
   {"Brazil",             55},  {"China",         86},
   {"Colombia",           57},  {"Egypt",         20},
   {"Ethiopia",          251},  {"France",        33},
   {"Germany",            49},  {"India",         91},
   {"Indonesia",          62},  {"Iran",          98},
   {"Italy",              39},  {"Japan",         81},
   {"Korea, Republic of", 82},  {"Mexico",        52},
   {"Nigeria",           234},  {"Pakistan",      92},
   {"Philippines",        63},  {"Poland",        48},
   {"Russia",              7},  {"South Africa", 27},
   {"Spain",              34},  {"Thailand",      66},
   {"Turkey",             90},  {"Ukraine",        7},
   {"United Kingdom",     44},  {"Vietnam",       84},
   {"Zaire",             243}};

main()
{
...
}