c++ - 仅在 vector 末尾打印新行 - "if"循环之外的 "for"语句

Question

代码:

#include <iostream>
#include <vector>

int main () {

std::cout << "Please, enter the number of iterations: ";    //Inputs

int iterations;
std::cin >> iterations;

std::cout << "Which term would you like to know: ";

int term;
std::cin >> term;   //End inputs

std::vector<int> series;     //definition of vector "series"

for (int n = 1;  n <= iterations; n++) {    //creation of "series"

    int next = (2 * n - 3);
    series.push_back(next);

}

std::cout << "The value of term "   //prints the n term
          << term
          << " is: "
          << series[term-1]         //term-1 "adjust" the indexing
          << std::endl;

std::cout << "The entire serie up to "
          << iterations
          << " terms is: ";

for (int i = 0;  i < series.size(); i++) {      //prints (elements of vector) "series"

    std::cout << series[i] << ' ';

    if (i == series.size()-1) {     //new line only at the end the series

        std::cout << std::endl; 
    }

}

return 0;

}

我得到了 9/10 的评论:“如果循环内的条件只会满足一次，但每次都会检查。移出循环”。我真的不知道如何将 if 语句置于循环之外。该 for-if 语句的范围是仅在 vector “系列”的末尾添加一个新行。我不能考虑其他任何事情，但可以肯定的是我有足够的经验并且还有另一个更优雅的解决方案。我在这里问是因为我必须提交另一份作业，我不想提交时出现同样的错误。

PS:另一条评论是:轻度过度评论。我真的评论太多了吗？

Answer 1

你在for循环的最后打印了endl，所以你可以在退出的时候加上endl这一行循环并删除 for 循环处的行，它会给你相同的结果

代码:

for (int n = 1;  n <= iterations; n++) {    //creation of "series"

    int next = (2 * n - 3);
    series.push_back(next);

}

std::cout << "The value of term "   //prints the n term
          << term
          << " is: "
          << series[term-1]         //term-1 "adjust" the indexing
          << std::endl;

std::cout << "The entire serie up to "
          << iterations
          << " terms is: ";

for (int i = 0;  i < series.size(); i++) {      //prints (elements of vector) "series"

    std::cout << series[i] << ' ';
}
std::cout << std::endl; 
return 0;

}