# First uppercase letter in a string (Iterative and Recursive) in C++

C++Server Side ProgrammingProgramming

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.

Live Demo

#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.

Live Demo

#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.

Published on 29-Dec-2020 11:14:06