C++Primer第五版第五章练习5.5

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本文介绍了一个C++编程练习，通过if-else语句实现将输入的数字成绩映射到字母等级，包括A+、A、B、C、D和F。

/*
练习5.5：
写一段自己的程序，使用if else语句实现把数字成绩转换成字母成绩的要求：
*/
#include "TouWenJian_5.h"
//参考答案后，重新写
int main()
{
	int grade=0;
	string lettergrade="";
	vector<string> scores{"F", "D", "C", "B", "A", "A++"};
	while(cin>>grade)
	{
		auto iterator_begin=scores.begin();
		if(grade<60)
			lettergrade = *iterator_begin;
		else if(grade<100){
			lettergrade=*(iterator_begin+(grade-50)/10);
			if(grade % 10 <3)
				lettergrade += "-";
			else if(grade % 10 > 7)
				lettergrade += "+";
		}
		else if(grade==100)
			lettergrade=*(iterator_begin+scores.size()-1);
		cout<<grade<<": "<<lettergrade<<endl;
	}
}
/*第一次自己写的
int main()
{
	int grade=0;
	string lettergrade="";
	vector<string> scores{"F", "D", "C", "B", "A", "A++"};
	while(cin>>grade)
	{
		auto iterator_begin=scores.begin();
		if(grade<60)
			lettergrade = *iterator_begin;
		else if(grade<70){
			lettergrade=*(iterator_begin+(grade-50)/10);
			if(grade % 10 <3)
				lettergrade += "-";
			else if(grade % 10 > 7)
				lettergrade += "+";
		}
		else if(grade<80){
			lettergrade=*(iterator_begin+(grade-50)/10);
			if(grade % 10 <3)
				lettergrade += "-";
			else if(grade % 10 > 7)
				lettergrade += "+";
		}
		else if(grade<90){
			lettergrade=*(iterator_begin+(grade-50)/10);
			if(grade % 10 <3)
				lettergrade += "-";
			else if(grade % 10 > 7)
				lettergrade += "+";
		}
		else if(grade<100){
			lettergrade=*(iterator_begin+(grade-50)/10);
			if(grade % 10 <3)
				lettergrade += "-";
			else if(grade % 10 > 7)
				lettergrade += "+";
		}
		else if(grade==100)
			lettergrade=*(iterator_begin+scores.size()-1);
		cout<<grade<<": "<<lettergrade<<endl;
	}
}
*/