简单写了个程序，若满意请及时采纳，谢谢
int main()
{
char st[]="9223372036854775808"; //字符串转64
unsigned __int64 ui64;
sscanf(st,"%I64u",&ui64);
printf("%I64u\n",ui64);
char ss[35]; //64转字符串
sprintf(ss,"%I64u",ui64) ;
printf("%s\n",ss);
return 0;
}
_atoi64和_i64toa
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