C++ Vector Exercises: Capitalize the first character of each vector element

Last update on December 20 2024 12:32:39 (UTC/GMT +8 hours)

Write a C++ program to capitalize the first character of each element of a given string vector. Return the new vector.

Sample Data:
({"red", "green", "black", "white", "Pink"}) ->
("Red", "Green", "Black", "White", "Pink"})

Sample Solution-1:

C++ Code:

#include <algorithm>    // Including the Algorithm Library for certain functions like sort
#include <iostream>     // Including the Input/Output Stream Library
#include <vector>       // Including the Vector Library for using vectors

using namespace std;    // Using the Standard Namespace

// Function to modify the vector of strings by capitalizing the first character of each word and converting the rest to lowercase
std::vector<std::string> test(std::vector<std::string> colors) {
  for(int i = 0; i < colors.size(); i++) { // Looping through each string in the vector
    colors[0][0] = toupper(colors[0][0]); // Capitalizing the first character of the first string in the vector

    // Capitalizing the first character of each string in the vector and converting the rest to lowercase
    colors[i][0] = toupper(colors[i][0]); // Capitalizing the first character of the current string
    for(int l = 1; l < colors[i].size(); l++) { // Looping through the characters of the current string (except the first character)
      colors[i][l] = tolower(colors[i][l]); // Converting characters to lowercase
    }
  }
  return colors; // Returning the modified vector of strings
}

// Main function
int main() {
  vector<string> colors = {"red", "green", "black", "white", "Pink"}; // Initializing a vector of strings

  cout << "Original Vector elements:\n";
  for (string c : colors)
    cout << c << " "; // Printing the original elements of the vector

  vector<string> result = test(colors); // Calling the test function to modify the strings in the vector
  cout << "\n\nCapitalize the first character of each vector element:\n";
  for (string c : result)
    cout << c << " "; // Printing the modified elements of the vector
}

Sample Output:

Original Vector elements:
red green black white Pink 

Capitalize the first character of each vector element:
Red Green Black White Pink

Flowchart:

Sample Solution-2:

C++ Code:

#include <algorithm>    // Including the Algorithm Library for certain functions like transform
#include <iostream>     // Including the Input/Output Stream Library
#include <vector>       // Including the Vector Library for using vectors

using namespace std;    // Using the Standard Namespace

// Function to modify the vector of strings by capitalizing the first character of each word and converting the rest to lowercase
std::vector<std::string> test(std::vector<std::string> colors) {
  for (std::string &cl : colors) { // Looping through each string in the vector by reference
    std::transform(cl.begin(), cl.end(), cl.begin(), ::tolower); // Converting all characters in the string to lowercase
    cl[0] = std::toupper(cl[0]); // Capitalizing the first character of the string
  }
  return colors; // Returning the modified vector of strings
}

// Main function
int main() {
  vector<string> colors = {"red", "green", "black", "white", "Pink"}; // Initializing a vector of strings

  cout << "Original Vector elements:\n";
  for (string c : colors)
    cout << c << " "; // Printing the original elements of the vector

  vector<string> result = test(colors); // Calling the test function to modify the strings in the vector
  cout << "\n\nCapitalize the first character of each vector element:\n";
  for (string c : result)
    cout << c << " "; // Printing the modified elements of the vector
}

Sample Output:

Original Vector elements:
red green black white Pink 

Capitalize the first character of each vector element:
Red Green Black White Pink

Flowchart:

C++ Code Editor:

Contribute your code and comments through Disqus.

Previous C++ Exercise: Create an n x n matrix by taking an integer (n).
Next C++ Exercise: First string contains all letters from second string.