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First uppercase letter in a string (Iterative and Recursive) in C++
In this tutorial, we are going to learn how find the first uppercase letter in the given string. Let's see an example.
Input −Tutorialspoint
Output −T
Let's see the steps to solve the problem using iterative method.
Initialize the string.
Iterate over the string.
Check whether the current character is uppercase or not using isupper method.
If the character is uppercase than return the current character.
Example
Let's see the code.
#include <bits/stdc++.h>
using namespace std;
char firstUpperCaseChar(string str) {
for (int i = 0; i < str.length(); i++)
if (isupper(str[i])) {
return str[i];
}
return 0;
}
int main() {
string str = "Tutorialspoint";
char result = firstUpperCaseChar(str);
if (result == 0) {
cout << "No uppercase letter" << endl;
}
else {
cout << result << endl;
}
return 0;
}Output
If you run the above code, then you will get the following result.
T
Let's see the steps to solve the problem using recursive method.
Initialize the string.
Write a recursive function which accepts two parameter string and index.
If the current character is end of the string then return.
If the current character is uppercase then return the current character.
Example
Let's see the code.
#include <bits/stdc++.h>
using namespace std;
char firstUpperCaseChar(string str, int i = 0) {
if (str[i] == '\0') {
return 0;
}
if (isupper(str[i])) {
return str[i];
}
return firstUpperCaseChar(str, i + 1);
}
int main() {
string str = "Tutorialspoint";
char result = firstUpperCaseChar(str);
if (result == 0) {
cout << "No uppercase letter";
}
else {
cout << result << endl;
}
return 0;
}Output
If you run the above code, then you will get the following result.
T
Conclusion
If you have any queries in the tutorial, mention them in the comment section.
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