[英]I don't know how to write the average grade with variables
我正在嘗試自動設置給定變量的數量,例如:
char subject1[30];
char subject2[30];
char subject3[30];
float grade1;
float grade2;
float grade3;
cout << "Type in your first subject: " ;
cin >> subject1;
cout << "Type in your second subject: ";
cin >> subject2;
cout << "Type in your third subject: ";
cin >> subject3;
cout << "Type in your grade for: " << subject1 << " :";
cin >> grade1;
cout << "Type in your grade for: " << subject2 << " :";
cin >> grade2;
cout << "Type in your grade for: " << subject3 << " :";
cin >> grade3;
float sum = grade1 + grade2 + grade3;
float average = (sum / 3);
cout << "AVERAGE GRADE";
cout << "************************************" << endl;
cout << subject1 << grade1 << endl;
cout << subject2 << grade2 << endl;
cout << subject3 << grade3 << endl;
cout << "====================================" << endl;
cout << "Average: " << average << endl;
return 0;
計算它的代碼有效,但我想知道如何放置用戶輸入的 3 個等級。 所以我每次添加另一個主題時都不必去編輯計算部分。 我不確定我是否解釋清楚我的意思,但我希望你能理解。
一個簡單的解決方案是將所有內容都存儲在一個vector
(大多數情況下,這比您使用的char array
受歡迎),然后就您擁有的主題數量進行循環。
#include <vector> // need to inlcude this to be able to use vector
#include <iostream>
const int numSubjects = 3;
std::vector<std::string> prefix{"first", "second", "third"};
std::vector<std::string> subjects(numSubjects);
std::vector<float> grades(numSubjects);
for(int i = 0; i < numSubjects; i++) {
std::cout << "Type in your " << prefix[i] << " subject: ";
std::cin >> subjects[i];
std::cout << "Type in your grade for " << subjects[i] << ": ";
std::cin >> grades[i];
}
//afterwards do the calculations
請注意,我用numSubjects
的大小初始化了向量,這樣您就可以使用[]
運算符訪問和寫入向量的索引。 如果不使用大小初始化vector
,則可以使用push_back()
插入元素。
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