C++ Program to Pair - Store Two Values Together with Explanation
C++
Medium
STL
39 views
1 min read
180 words
This problem helps you practice core C++ fundamentals in a practical way. It builds intuition around pair, two, store. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Store two related values as single unit.
Real Life: Storing coordinates (x,y), name-age pairs.
Input Format
No user input.
Two related values are stored together.
Output Format
Both values printed as a single unit.
Constraints
• Use pair
• Values can be of same or different data types
Concept Explanation
Sometimes two values are logically connected and should be stored together.
Example:
• (x, y) coordinates
• (name, age)
C++ provides pair to store two related values as one unit.
Step-by-Step Logic
1.Create a pair variable.
2.Store first value in pair.first.
3.Store second value in pair.second.
4.Both values are now linked together as one unit.
5.Access and print values using .first and .second.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
void stl_q10_pair() {
pair<string, int> student = make_pair("Raj", 20);
cout << "Name: " << student.first << endl;
cout << "Age: " << student.second << endl;
// Vector of pairs
vector<pair<string, int>> students;
students.push_back(make_pair("Priya", 22));
students.push_back(make_pair("Amit", 21));
for(auto s : students) {
cout << s.first << " - " << s.second << endl;
}
}
Output Example
Output:
First value = 10
Second value = 20
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Solution Guide
Problem
Store two related values as single unit.
Real Life: Storing coordinates (x,y), name-age pairs.
Input / Output
Input
No user input.
Two related values are stored together.
Output
Both values printed as a single unit.
Constraints
• Use pair
• Values can be of same or different data types
Examples
Output:
First value = 10
Second value = 20
Explanation
Concept Explanation
Sometimes two values are logically connected and should be stored together.
Example:
• (x, y) coordinates
• (name, age)
C++ provides pair to store two related values as one unit.
Step-by-Step Explanation
1.Create a pair variable.
2.Store first value in pair.first.
3.Store second value in pair.second.
4.Both values are now linked together as one unit.
5.Access and print values using .first and .second.
Details
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Official Solution
void stl_q10_pair() {
pair<string, int> student = make_pair("Raj", 20);
cout << "Name: " << student.first << endl;
cout << "Age: " << student.second << endl;
// Vector of pairs
vector<pair<string, int>> students;
students.push_back(make_pair("Priya", 22));
students.push_back(make_pair("Amit", 21));
for(auto s : students) {
cout << s.first << " - " << s.second << endl;
}
}
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