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Case-insensitive string comparison in C++
In C++ we have strings in standard library. In this program we will see how to check whether two strings are identical or not. In this case we will ignore the case.
Here the logic is simple. We will convert the whole string into lowercase or uppercase strings, then compare them, and return the result.
We have used the algorithm library to get the transform function to convert the string into lowercase string.
Input: Two strings “Hello WORLD” and “heLLO worLD” Output: Strings are same
Algorithm
Step 1: Take two strings str1, and str2 Step 2: Convert str1, and str2 into lowercase form Step 3: Compare str1 and str2 Step 4: End
Example Code
#include<iostream>
#include <algorithm>
using namespace std;
int case_insensitive_match(string s1, string s2) {
//convert s1 and s2 into lower case strings
transform(s1.begin(), s1.end(), s1.begin(), ::tolower);
transform(s2.begin(), s2.end(), s2.begin(), ::tolower);
if(s1.compare(s2) == 0)
return 1; //The strings are same
return 0; //not matched
}
main() {
string s1, s2;
s1 = "Hello WORLD";
s2 = "heLLO worLD";
if(case_insensitive_match(s1, s2)) {
cout << "Strings are same";
}else{
cout << "Strings are not same";
}
}Output
Strings are same
Updated on: 30-Jul-2019
7K+ Views
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