String Functions Part 2

Part of the Fundamentals section of Coddy's C++ journey — lesson 71 of 74.

Here are more useful functions for strings:

erase(pos, len): Removes len characters starting at position pos from the current string.

find(str): Returns the position of the first occurrence of str in the current string. Returns some object that can be compared to -1 if not found.

clear(): Removes all characters from the string, making it empty.

empty(): Returns true if the string is empty, false otherwise.

For example using the following string:

std::string str = "Hello, World!";

int pos = str.find("World");
// Output: pos = 7 (position where "World" starts)

str.erase(5, 2);
// Output: "HelloWorld!"

str.clear();
// Output: "" (empty string)

bool isEmpty = str.empty();
// Returns true if str has no characters

Challenge

Easy

Create a function named stringSearchOperations that takes a string as input and performs the following operations using string functions:

Finds and prints the position of the first space character in the string.
Erases 4 characters from position 5.
Checks if the string contains the word "You" and prints "Found" or "Not Found".
Clears the string and checks if it's empty.
Prints the results after each operation.

Use the following format:

Space Found At: [Position of space]
After Erase: [String after erasing]
Contains You: [Found/Not Found]
Is Empty: [true/false]

Cheat sheet

Useful string functions in C++:

erase(pos, len): Removes len characters starting at position pos
find(str): Returns the position of the first occurrence of str (returns -1 if not found)
clear(): Removes all characters from the string
empty(): Returns true if the string is empty, false otherwise

std::string str = "Hello, World!";

int pos = str.find("World");
// pos = 7 (position where "World" starts)

str.erase(5, 2);
// Result: "HelloWorld!"

str.clear();
// Result: "" (empty string)

bool isEmpty = str.empty();
// Returns true if str has no characters

Try it yourself

#include <iostream>
#include <string>

void stringSearchOperations(std::string str) {
    // Find first space

    // Erase 4 characters from position 5

    // Check if contains "You"

    // Clear string and check if empty
}

int main() {
    std::string str;
    std::getline(std::cin, str);
    stringSearchOperations(str);
    return 0;
}

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

3Variables Part 2

Type Declaration Naming Conventions Recap - Initialize Variables Type Casting Part 1 Type Casting Part 2

6Decision Making

If Statement If - Else Switch Statement Conditional Operator Recap - If Else Nested If - Else

9Loops

For Loop Part 1 While Loop Do While Loop Break Continue For Loop Part 2 Nested Loops Infinite Loops Recap - Dynamic Input

12Strings

C-style Strings Part 1 C-style Strings Part 2 String Operations String Functions Part 1String Functions Part 2