#include<stdio.h>
#include<math.h>
int main()
{
unsigned int sum;
int n,a1, q;
scanf_s("%d", &n);
a1 = 1;
q = 2;
sum = a1*(1 - pow(q,n) )/ (1 - q);
printf("n=:%d,sun=%u\n", n, sum);
return 0;
}
不能，n取64时，计算结果数据过大，超出无符号整形的范围
标签：main,task3,int,sum,a1,include From： https://www.cnblogs.com/lht22MoonHalo/p/16801889.html