我有一个 .txt 文件,如下所示:
(0.781860352, -11.6927013, 7.20992613)
(0.364501476, -9.41256046, 6.87873077)
(0.394773483, -7.85253429, 6.90275288)
我需要一个代码来分别从每一行访问每个双精度。我在解决这个问题时遇到了麻烦。有任何想法吗?
谢谢!
更新:
所以,就像我说的,我使用 Kerrek SB 的建议从每一行访问每个双精度数,然后我将这些值存储到向量的组件中,然后我访问每个组件并执行一个操作(比如将它们相乘),并且将结果存储到数组中;最后我添加了数组的内容。无论如何,这是代码:
int main() {
//=============================
//Initial Declarations
//=============================
Vector3 r(0,0,0);
int num = 0 , i;
string line;
char c, d1, d2, d3, d4;
double v1, v2, v3 , b[num];
//=============================
//Counting Lines in File
//=============================
ifstream is;
is.open ("data.txt");
while (is.good())
{
c = is.get();
if (c=='\n')num++;
}
is.close();
cout<<"Number of lines in file is "<<num<<endl;
//=============================
//Getting Data
//=============================
ifstream infile("data.txt");
for (line ,i=0 ; getline(infile, line), i<=num-1;i++ )
{
istringstream iss(line);
if (!((iss >> d1 >> v1 >> d2 >> v2 >> d3 >> v3 >> d4 >> ws) &&
iss.get() == EOF &&
d1 == '(' && d2 == ',' && d3 == ',' && d4 == ')'))
{
}
// Placing data in vector
r[0] = v1;
r[1] = v2;
r[2] = v3;
//Placing data from vector into array
b[i] = r[0]*r[1]*r[2];
}
// Adding contents of array
valarray <double> bfinal (b,num);
double b_final = bfinal.sum();
cout<< b[0] << "," << b[1] << ", " << b_final << endl;
return 0;
}
代码有效(实际上它没有正确添加数组的内容),但看起来有点粗糙。我觉得它可以被简化和/或更简洁。有任何想法吗?