【高分】fscanf怎么从文件中读入double类型数据

[sin816]

数据文件test.txt中如下数据
3
10.026278 10.461819
.026278 10.461819
10.026278 40.461819
4
-24.718327 10.256420
-9.718327 10.256420
-24.718327 40.256420
-9.718327 40.256420
5
-25.701054 -40.155312
-10.701054 -40.155312
-25.701054 -10.155312
-10.701054 -10.155312
10.639103 -40.642311

void fun()
{
	FILE *fp = fopen("test.txt","r");
	double x,y;
	int num;
	//float x,y;
	while (!feof(fp))
	{
		fscanf(fp, "%d\n", &num);
		cout<<num<<endl;
		for(int i=0; i<num; i++)
		{
			fscanf(fp, "%f%f", &x, &y);
			cout<<x<<", "<<y<<endl;
		}
		cout<<endl;
	}
}

如果采用x、y采用double类型，会输出如下指数形式（不是我想要的，结果也不对）
3
-9.25596e+061, -9.25596e+061
-9.25596e+061, -9.25596e+061
-9.25596e+061, -9.25596e+061

4
-9.25596e+061, -9.25596e+061
-9.25596e+061, -9.25596e+061
-9.25596e+061, -9.25596e+061
-9.25596e+061, -9.25596e+061

5
-9.25596e+061, -9.25596e+061
-9.25596e+061, -9.25596e+061
-9.25596e+061, -9.25596e+061
-9.25596e+061, -9.25596e+061
-9.25596e+061, -9.25596e+061

如果x、y采用float类型 读入的数据精度不够
3
10.0263, 10.4618
0.026278, 10.4618
10.0263, 40.4618

4
-24.7183, 10.2564
-9.71833, 10.2564
-24.7183, 40.2564
-9.71833, 40.2564

5
-25.7011, -40.1553
-10.7011, -40.1553
-25.7011, -10.1553
-10.7011, -10.1553
10.6391, -40.6423

请教大家怎么才能从文件中读入double 类型数据呢，并赋值给 double变量？？？

[ltc_mouse]

是不是要用fscanf(fp, "%lf %lf", &x,&y)才能读入double呀?

C++其实可以使用ifstream的~

double x, y;
ifstream ifs("test.txt");
ifs >> num;
ifs >> x >> y;

[Cpp权哥]

格式控制符要用%lf才行。

[goodname]

fscanf(fp, "%lf%lf", &x, &y);

printf("%.6f,%.6f\n",x,y);

[hylove9494]

%lf

[liliangbao]

fscanf(fp, "%lf%lf", &x, &y);
即可！

[mengde007]

%lf就搞定了呀……