结构元素的排序向量 [英] sort vector of struct element
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问题描述
我想排序结构的元素的向量,但我不能构造向量本身这里是代码
#include < string>
#include< vector>
#include< algorithm>
using namespace std;
struct student_t {
string name;
int age,score;
};
bool compare(student_t const& lhs,student_t const& rhs){
if(lhs.name return true;
else if(rhs.name< lhs.name)
return false;
else
if(lhs.age< rhs.age)
return true;
else if(rhs.age< lhs.age)
return false;
return lhs.score< rhs.score;
}
int main(){
struct student_t st [10];
return 0;当我声明向量< student_t> st 时,
我无法访问struct的元素,请给我提示如何做
解决方案
std :: vector< student_t> st;
for(unsigned i = 0; i <10; ++ i)st.push_back(student_t());
std :: sort(st.begin(),st.end(),& compare);
您也可以使用此向量
第1-2行:
std :: vector< student_t> st(10 / *,student_t()* /);
编辑:
如果你想用键盘输入10个学生,你可以写一个构造学生的函数:
struct student_t& ; enter_student()
{
student_t s;
std :: cout<< 输入名称<< std :: endl;
std :: cin>> s.name;
std :: cout<< 输入年龄< std :: endl;
std :: cin>>智者;
std :: cout<< Enter score<< std :: endl;
std :: cin>>分数
return s;
}
std :: vector< student_t> st;
for(unsigned i = 0; i <10; ++ i)st.push_back(enter_student());
i am trying to sort vector of struct's elements,but i can't construct vector itself here is code
#include <string> #include <vector> #include <algorithm> using namespace std; struct student_t{ string name; int age,score; } ; bool compare(student_t const &lhs,student_t const &rhs){ if (lhs.name<rhs.name) return true; else if (rhs.name<lhs.name) return false; else if (lhs.age<rhs.age) return true; else if (rhs.age<lhs.age) return false; return lhs.score<rhs.score; } int main(){ struct student_t st[10]; return 0; }
when i declared
vector<student_t>st
i can't access element of struct,please give me hint how to do it解决方案std::vector<student_t> st; for(unsigned i = 0; i < 10; ++i) st.push_back(student_t()); std::sort(st.begin(), st.end(), &compare);
You could also use this
vector
constructor instead of lines 1-2:std::vector<student_t> st (10 /*, student_t() */);
Edit:
If you want to enter 10 students with the keyboard you can write a function that constructs a student:
struct student_t &enter_student() { student_t s; std::cout << "Enter name" << std::endl; std::cin >> s.name; std::cout << "Enter age" << std::endl; std::cin >> s.age; std::cout << "Enter score" << std::endl; std::cin >> s.score; return s; } std::vector<student_t> st; for(unsigned i = 0; i < 10; ++i) st.push_back(enter_student());
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