<分区>
我正在通过 Sololearn 学习 C++。我对函数重载有疑问
这是代码
#include<iostream>
using namespace std;
void printSomething(int x) {
cout << "I'm printing an integer " << x << endl;
}
void printSomething(float x) {
cout << "I'm printing a float " << x << endl;
}
int main() {
int a =3;
float b = 2.65;
printSomething(a);
printSomething(b);
return 0;
}
输出为
I'm printing an integer 3
I'm printing a float 2.65
但是如果我在调用函数时直接给出参数
像这样
#include<iostream>
using namespace std;
void printSomething(int x) {
cout << "I'm printing an integer " << x << endl;
}
void printSomething(float x) {
cout << "I'm printing a float " << x << endl;
}
int main() {
printSomething(3);
printSomething(2.65);
return 0;
}
出现以下错误
..\Playground: In function 'int main()': ..\Playground:19:24: error: call of overloaded 'printSomething(double)' is ambiguous printSomething(2.65); ^ ..\Playground:19:24: note: candidates are: ..\Playground:5:6: note: void printSomething(int) void printSomething(int x) { ^ ..\Playground:9:6: note: void printSomething(float) void printSomething(float x) { ^
但如果我改变
void printSomething(float x) {
cout << "I'm printing a float " << x << endl;
}
到
void printSomething(double x) {
cout << "I'm printing a float " << x << endl;
}
我将得到输出
I'm printing a float 2.65
这是为什么呢？ 但如果它只是整数，它就可以正常工作
#include<iostream>
using namespace std;
void printSomething(int x) {
cout << "I'm printing an integer " << x << endl;
}
void printSomething(float x) {
cout << "I'm printing a float " << x << endl;
}
int main() {
printSomething(3);
return 0;
}
结果
I'm printing an integer 3
为什么这不适用于 float
谢谢