C++ Program to Compare Two Strings with Explanation
C++
Easy
Strings
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1 min read
170 words
This problem helps you practice core C++ fundamentals in a practical way. It builds intuition around same, two, compare. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Check if two strings are exactly same or not.
Real Life: Like password verification.
Input Format
Two strings str1 and str2.
Output Format
Print
• Same
OR
• Not Same
Constraints
• Strings length ≥ 1
• Case-sensitive (A ≠ a)
• Compare character by character
Concept Explanation
Two strings are exactly same if:
• They have the same length
• All characters at the same positions are equal
This is used in password verification.
Step-by-Step Logic
1.Take input strings str1 and str2.
2.If lengths are different:
• Print Not Same.
3.Traverse both strings from start to end.
4.Compare characters at each position.
5.If any character does not match:
• Print Not Same and stop.
6.If all characters match:
• Print Same.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
void string_q5_compare() {
string str1 = "Hello";
string str2 = "Hello";
bool areEqual = true;
if(str1.length() != str2.length()) {
areEqual = false;
} else {
for(int i = 0; i < str1.length(); i++) {
if(str1[i] != str2[i]) {
areEqual = false;
break;
}
}
}
if(areEqual) {
cout << "Strings are EQUAL" << endl;
} else {
cout << "Strings are NOT EQUAL" << endl;
}
}
Output Example
Input:
password123
password123
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
Check if two strings are exactly same or not.
Real Life: Like password verification.
Input / Output
Input
Two strings str1 and str2.
Output
Print
• Same
OR
• Not Same
Constraints
• Strings length ≥ 1
• Case-sensitive (A ≠ a)
• Compare character by character
Examples
Input:
password123
password123
Explanation
Concept Explanation
Two strings are exactly same if:
• They have the same length
• All characters at the same positions are equal
This is used in password verification.
Step-by-Step Explanation
1.Take input strings str1 and str2.
2.If lengths are different:
• Print Not Same.
3.Traverse both strings from start to end.
4.Compare characters at each position.
5.If any character does not match:
• Print Not Same and stop.
6.If all characters match:
• Print Same.
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 string_q5_compare() {
string str1 = "Hello";
string str2 = "Hello";
bool areEqual = true;
if(str1.length() != str2.length()) {
areEqual = false;
} else {
for(int i = 0; i < str1.length(); i++) {
if(str1[i] != str2[i]) {
areEqual = false;
break;
}
}
}
if(areEqual) {
cout << "Strings are EQUAL" << endl;
} else {
cout << "Strings are NOT EQUAL" << endl;
}
}
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