[問題] 九個1乘九個1等於多少？
一開始是用labview寫的
發現答案是 12345678987654320 直覺應該是 12345678987654321
用c寫也是一樣
================================================
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
double a=111111111,b;
b=a*a;
printf("%.lf \n",b);
system("pause");
return 0;
}
===============================================
int64 會不夠嗎？
用matlab試了一下，直接打111111111*111111111 值出不了，只好直接試大小
===============================================
>> x=12345678987654321;
>> int64(x)
ans =
12345678987654320
===============================================
不知大家有沒有什麼解決的辦法呢？
感謝！
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