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/