接4.1，

個人修改後

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main()
{
int cishu = 0;
int jiage;
int biaozhun;

srand((unsigned) time(NULL));
biaozhun = (rand() * rand()) % 59 + 1;
for( ;biaozhun != jiage; )
{
printf("請輸入你猜測的價格");
scanf("%d",&jiage);
if(biaozhun < jiage)
{
printf("猜的高了哦\n");
cishu++;
}
else if(biaozhun > jiage)
{
printf("猜的低了哦\n");
cishu++;
}
else
{
printf("恭喜你猜對了\n");
cishu++;
}
}
printf("一共猜測%d次，價格為%d",cishu,jiage);

return 0;
}

更改歷程：修改do-while為for 迴圈，null前未加time導致資料固定。修改完畢