我想知道如何使用push_back方法向我的结构 vector 添加值

struct subject
{
  string name;
  int marks;
  int credits;
};


vector<subject> sub;

那么,现在如何向其中添加元素?

我有初始化字符串名称的函数(以它的主题名称为准)
void setName(string s1, string s2, ...... string s6)
{
   // how can i set name too sub[0].name= "english", sub[1].name = "math" etc

  sub[0].name = s1 // gives segmentation fault; so how do I use push_back method?

  sub.name.push_back(s1);
  sub.name.push_back(s2);
  sub.name.push_back(s3);
  sub.name.push_back(s4);

  sub.name.push_back(s6);

}

函数调用
setName("english", "math", "physics" ... "economics");

最佳答案

创建 vector push_back元素,然后进行如下修改:

struct subject {
    string name;
    int marks;
    int credits;
};


int main() {
    vector<subject> sub;

    //Push back new subject created with default constructor.
    sub.push_back(subject());

    //Vector now has 1 element @ index 0, so modify it.
    sub[0].name = "english";

    //Add a new element if you want another:
    sub.push_back(subject());

    //Modify its name and marks.
    sub[1].name = "math";
    sub[1].marks = 90;
}

您无法使用[#]访问 vector ,直到该索引中的 vector 中存在一个元素。本示例填充[#],然后对其进行修改。

关于c++ - 结构初始化 vector ,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/8067338/

10-12 12:31
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