[問題] 請問最後destructure沒輸出?

看板C_and_CPP (C/C++)作者adoniscomes (adonis)時間16年前 (2009/06/02 14:21)推噓2(2推 0噓 7→)

留言9則, 3人參與討論串1/1

#include<iostream> #include<iomanip> #include<cmath> using namespace std; class Resistor { float r1; public: Resistor(float a) { r1=a; } friend ostream&operator<<(ostream &val,Resistor &re) { //或者在開個副程式寫 cout<<"Repeat:\n\nInput Resistance(kΩ) = "<<re.r1<<" kΩ"<<endl; } ~Resistor() { cout<<"Resistor is destoryed."<<endl; } }; class Circuit { float current,voltage; public: Resistor r2; Circuit(float a,float va3):r2(a) { voltage=va3; current=va3/a; } friend ostream &operator<<(ostream &va2,Circuit &i) { cout<<i.r2; cout<<"Input Voltage(V) = "<<i.voltage<<" V\n"<<endl; cout<<"calculated Current = "<<i.current<<" mA"<<endl; } ~Circuit() { cout<<"Circuit is destroyed."<<endl; } }; int main() { float rin,vin; cout<<"Input the Resistance (kΩ): "; cin>>rin; cout<<"Input the Voltage (V) : "; cin>>vin; Circuit C(rin,vin); cout<<C; system("pause"); return 0; } ================以上為程式碼==================== 我想要的結果是印出Circuit(電流) 和circuit及resistor兩者destroyed的結果但最後兩沒有出現上述二者毀滅的輸出請問是哪出錯了呢 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 120.107.174.108

推

VictorTom

06/02 14:30, , 1^F

06/02 14:30, 1^F

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iamivers0n

06/02 14:36, , 2^F

06/02 14:36, 2^F

可是如果我用下面這個的話就可以 #include<iostream> #include<iomanip> using namespace std; class Resistor { float r; public: Resistor(float x) { r=x; } friend ostream &operator<<(ostream &str,Resistor obj) { cout<<"Resistance = "<<obj.r<<" Ω\n"; } ~Resistor() { cout<<"Resistor is destroyed.\n"; } }; class Circuit { Resistor r; float current,voltage; public: Circuit(float x,float y):r(x) { voltage=y; current=y/x; } friend ostream &operator<<(ostream &str,Circuit obj) { cout<<obj.r; cout<<"Current = "<<obj.current<<" A\n"; cout<<"Voltage = "<<obj.voltage<<" V\n"; } ~Circuit() { cout<<"Circuit is destroyed.\n"; } }; int main() { float r,v; cout<<"Please input the Resistance: "; cin>>r; cout<<"Please input the Voltage: "; cin>>v; Circuit c(r,v); cout<<endl<<c; system("pause"); return 0; } 下面這個也有pause不是嗎? ※ 編輯: adoniscomes 來自: 120.107.174.108 (06/02 14:41)