C++浮點數操作
十進位制數的數值實現是一個浮點數。在C++程式語言中,浮點數的大小為32位。並且有一些浮點數操作函式可以處理浮點數。這裡我們介紹了一些浮點數操作函式。
fmod()
作用於浮點數的fmod()函式將返回該方法傳遞引數的除法餘數。
示例
#include <iostream>
#include <cmath>
using namespace std;
int main() {
float a, b, rem;
a = 23.4;
b = 4.1;
rem = fmod(a,b);
cout<<"The value of fmod( "<<a<<" , "<<b<<" ) = "<<rem;
}輸出
The value of fmod( 23.4 , 4.1 ) = 2.9
remainder()
remainder()函式的功能與fmod函式相同。並返回兩個值之間除法的餘數。此方法返回數值方面儘可能小的餘數。也可能是負數。
示例
#include <iostream>
#include <cmath>
using namespace std;
int main() {
float a, b, rem;
a = 23.4;
b = 4.1;
rem = remainder(a,b);
cout<<"The value of remainder( "<<a<<" , "<<b<<" ) = "<<rem;
}輸出
The value of remainder( 23.4 , 4.1 ) = -1.2
remquo()
此方法返回兩個傳遞值的商和餘數,它還需要一個變數的引用,該變數將具有商的值。因此,此方法將返回與remainder函式相同的餘數和商的引用。
示例
#include <iostream>
#include <cmath>
using namespace std;
int main() {
float a, b, rem;
int quo;
a = 23.4;
b = 4.1;
rem = remquo(a,b,&quo);
cout<<a<<" and "<<b<<" passed to the remquo() function gives the following output\n";
cout<<"The remainder is "<<rem<<endl;
cout<<"The quotient is "<<quo;
}輸出
23.4 and 4.1 pass to the the remque() function gives the following output The reminder is -1.2 The quotient is 6
copysign()
C語言的copysign函式返回一個具有其他變數符號的變數。返回的變數具有第一個變數的幅度和第二個變數的符號。
示例
#include <iostream>
#include <cmath>
using namespace std;
int main(){
double a, b;
a = 9.6;
b = -3.5;
cout<<"copysign function with inputs "<<a<<" and "<<b<<" is "<<copysign(a,b);
}輸出
Copysign function with inputs 9.6 and -3.5 is -9.6
fmin()
顧名思義,fmin函式返回函式兩個引數中的最小值。返回型別為浮點數。
示例
#include <iostream>
#include <cmath>
using namespace std;
int main(){
double a, b;
a = 43.5;
b = 21.2;
cout << "The smallest of "<<a<<" and "<<b<<" is "; cout << fmin(a,b)<<endl;
}
輸出
The smallest of 43.5 and 21.2 is 21.2
fmax()
fmax函式是一個C程式設計函式,它返回引數中兩個數字中最大的數字。
示例
#include <iostream>
#include <cmath>
using namespace std;
int main(){
double a, b;
a = 43.5;
b = 21.2;
cout << "The largest of "<<a<<" and "<<b<<" is "; cout << fmax(a,b)<<endl;
}輸出
The largest of 43.5 and 21.2 is 43.5
fdim()
C程式語言的fdim()函式返回作為函式引數傳送的兩個數字的絕對差。
示例
#include <iostream>
#include <cmath>
using namespace std;
int main(){
double a, b;
a = 43.5;
b = 21.2;
cout << "The absolute difference of "<<a<<" and "<<b<<" is";
cout << fdim(a,b)<<endl;
}輸出
The absolute difference of 43.5 and 21.2 is 22.3
fma()
C語言的fma()函式返回給定引數的乘積。該函式返回一個浮點數,並接受三個浮點引數。
示例
#include <iostream>
#include <cmath>
using namespace std;
int main(){
double a, b, c;
a = 3.5;
b = 2.4;
c = 7.2;
cout << "The multiplication of "<<a<<" , "<<b<<" and "<<c<<" is ";
cout << fma(a,b,c)<<endl;
}輸出
The multiplication of 3.5 , 2.4 and 7.2 is 15.6
這些都是在浮點數上操作的所有函式。這些函式在cmath庫中定義。
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