String functions overview in C++ - Mini Project: Build & Apply

String functions overview

📖 Scenario: You are working on a simple program that manages a list of fruit names. You want to learn how to use basic string functions in C++ to check lengths, find characters, and change case.

🎯 Goal: Build a program that creates a string, sets a character to uppercase, finds a character's position, and prints the length of the string.

📋 What You'll Learn

Create a string variable with a specific value

Create an integer variable to store the position of a character

Use string functions to find the length of the string

Use string functions to find the position of a character

Change a character in the string to uppercase

Print the results

💡 Why This Matters

🌍 Real World

String functions are used in many programs to process text, such as searching, formatting, and modifying user input.

💼 Career

Knowing basic string operations is essential for software development, data processing, and building user interfaces.

1

Create the string variable

Create a string variable called fruit and set it to the value "banana".

C++

#include 
#include 

int main() {

    // Create string variable fruit with value "banana"
    // Your code here

    return 0;
}

Need a hint?

Use std::string to create the variable and assign the value "banana".

2

Create a variable to store character position

Create an integer variable called pos and set it to the position of the first letter 'a' in the string fruit using the find function.

C++

#include 
#include 

int main() {

    std::string fruit = "banana";

    // Find position of 'a' in fruit and store in pos
    // Your code here

    return 0;
}

Need a hint?

Use fruit.find('a') to find the first occurrence of 'a'.

3

Change a character to uppercase

Change the character at position pos in fruit to uppercase using toupper from cctype. Include #include <cctype> at the top.

C++

#include 
#include 
#include 

int main() {

    std::string fruit = "banana";
    int pos = fruit.find('a');

    // Change character at pos to uppercase
    // Your code here

    return 0;
}

Need a hint?

Use std::toupper to convert the character to uppercase and assign it back.

4

Print the results

Print the length of fruit using fruit.length() and print the modified fruit string. Use two separate std::cout statements.

C++

#include 
#include 
#include 

int main() {

    std::string fruit = "banana";
    int pos = fruit.find('a');
    fruit[pos] = std::toupper(fruit[pos]);

    // Print length of fruit
    // Print modified fruit string
    // Your code here

    return 0;
}

Need a hint?

Use std::cout << fruit.length() << std::endl; and std::cout << fruit << std::endl; to print the results.