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錯(cuò)誤提示使用未初始化的局部變量如何解決

#include<iostream>
#include<stdlib.h>
using?namespace?std;
class?circle?{
public:
	???double?circle::getR()?{
		???double?r;
		???m_r?=?r;
		???return?m_r;
	}
	???double?circle::setS()?{
		???double?m_s;
		???return?m_s?=?pi*m_r*m_r;
	???
	???}
	???double?circle::setC()?{
		???double?m_c;
	???
		???return?m_c?=?2?*?pi*m_r;
	???
	???}
private:
	double?m_r;
	double?pi?=?3.14;

};
class?globe?{
public:
	double?globe::getR()?{
		double?r;
		m_r?=?r;
		return?m_r;
	}
	double?setV(){
		double?m_v;
		return?m_v?=?4?/?3?*?pi*m_r*m_r*m_r;
	
	}
private:
	double?m_r;
	double?pi?=?3.14;
};
int?main()?{
	circle?a;
	globe?b;
	double?r;
	cout?<<?"請(qǐng)輸入半徑："?<<?endl;
	cin?>>?r;
	a.getR();
	b.getR();
	cout?<<?"圓的面積為："?<<?a.setS()?<<?endl;
	cout?<<?"圓的周長(zhǎng)為："?<<?a.setC()?<<?endl;
	cout?<<?"球的體積為："?<<?b.setV()?<<?endl;

	system("pause");
	return?0;
}

如題，如何解決使用未初始化局部變量問(wèn)題？

飛羊扒虎

2017-01-17

源自：C++遠(yuǎn)征之封裝篇（上） 5-1

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1 回答

ming5473945740 回答被采納 +3 積分
2017-01-18

#include<iostream>
#include<stdlib.h>
#define?PI?3.14
using?namespace?std;
class?circle?{
public:
????double?getR()?{
????????double?r;
????????cout?<<?"請(qǐng)輸入圓的半徑："?<<?endl;
????????cin>>r;
????????m_r?=?r;
????????return?m_r;
????}
????double?setS()?{
????????double?m_s;
????????return?m_s?=?PI*m_r*m_r;
????????
????}
????double?setC()?{
????????double?m_c;
????????
????????return?m_c?=?2?*?PI*m_r;
????????
????}
private:
????double?m_r;
????
};
class?globe?{
public:
????double?getR()?{
????????double?r;
????????cout?<<?"請(qǐng)輸入球的半徑："?<<?endl;
????????cin>>r;
????????m_r?=?r;
????????return?m_r;

????}
????double?setV(){
????????double?m_v;
????????return?m_v?=?4?/?3?*?PI*m_r*m_r*m_r;
????????
????}
private:
????double?m_r;
};

int?main()?{
????
????circle?a;
????globe?b;
????a.getR();
????cout?<<?"圓的面積為："?<<?a.setS()?<<?endl;
????cout?<<?"圓的周長(zhǎng)為："?<<?a.setC()?<<?endl;
????
????
????b.getR();
????cout?<<?"球的體積為："?<<?b.setV()?<<?endl;
????
????system("pause");
????return?0;
}