跪求 C++计算1+3+3^2+3^3~~~+3^10 用for 语句

跪求 C++计算1+3+3^2+3^3~~~+3^10 用for 语句

#include
void main()
{
int a=0;
int s=0;
for(i=0;i<=10;i++)
{
a=power(3,i);
s=s+a;
}
}

int main()
{
int total =0;
for(int i=0; i<=10; i++)
{
total += pow(3,i);
}
cout << total << endl;
return 0;
}

参考资料：原创

long sum=1,mul=1;
for (int i=0;i<=10;i++)
{
for (int j=1;j<=i;j++)
{
mul*=3;
}
sum+=mul;
}

int sum = 0,mul=1;
for (int i = 0; i <= 10; ++ i)
{
mul = 1;
for(int j=0; j
mul = mul*3;
sum += mul;
}

int sum = 0, mul = 1;
for (int i = 0; i <= 10; ++ i)
{
sum += mul;
mul *= 3;
}