C++对于浮点数精度控制通过std::setprecision实现,但有一点要特别注意的是:默认情况下,std::setprecision控制的输出的有效位数。例如以下代码输出的可能是 0.00125,而实际上我们可能需要0.001: float v = 1.0f * std::rand() / RAND_MAX; std::cout << std::setprecision(3)
如果我们用float存储数据，float可以表示的数据范围$-2^{128}$到 $2^{128}$，看起来绝对够啊！那让...
#include <iostream> int main() { float pi = 3.14159f; std::cout << "The value of pi is: " << pi << std::endl; return 0; } 3. 控制浮点数打印时的精度 为了控制浮点数打印时的小数位数,可以使用 <iomanip> 头文件中的 std::fixed 和std::setpre...
int num1 = 10; float num2 = 3.14; std::string str = "Hello"; std::cout << "num1: " << num1 << ", num2: " << num2 << ", str: " << str << std::endl; 上述代码将输出以下内容: 代码语言:txt 复制 num1: 10, num2: 3.14, str: Hello ...
(long long __n); basic_ostream& operator<<(unsigned long long __n); basic_ostream& operator<<(float __f); basic_ostream& operator<<(double __f); basic_ostream& operator<<(long double __f); basic_ostream& operator<<(const void* __p); basic_ostream& operator<<(basic_streambuf<...
float: 单精度浮点数 double: 双精度浮点数 long double: 更长的双精度浮点数示例代码: cpp #include <iostream> int main() { float f = 3.14f; double d = 2.718; long double ld = 1.6180339887498948482; std::cout << "f = " << f << std::endl; ...
int main() { std::cout<<“五年级成绩表\n”; std::cout<<std::endl; std::cout<<“首先是第一名哈哈:\t<<100”; std::cout<<std::endl; std::cout<<“其次是第二名林林:\t<<90+9”; std::cout<<std::endl; std::cout<<“最后是最后一名明明:\t<<(float)8/5”; ...
1. doublenum =1234567.1234567; std::cout<< num <<"\n"; std::cout.setf(std::ios::fixed, std::ios::floatfield); std::cout<< num <<"\n"; std::cout.precision(4); std::cout<< num <<"\n"; 1. 2. 3. 4. 5. 6.
用std::cout.precision() 和std::cout.setf() 函数 doublenum =1234567.1234567; std::cout<< num <<"\n"; std::cout.setf(std::ios::fixed, std::ios::floatfield); std::cout<< num <<"\n"; std::cout.precision(4); std::cout<< num <<"\n"; ...
int numB;cin >> numA >> numB;就会依次读入一个float和一个int，这两个在输入时用空格分隔。以上...