String Reversal Approaches in DSA C - Build from Scratch

String Reversal Approaches

📖 Scenario: Imagine you are working on a simple text editor that needs to reverse words typed by the user. Reversing strings is a common task in many programs, such as creating palindromes or encoding messages.

🎯 Goal: Build a C program that reverses a given string using a character array and a loop.

📋 What You'll Learn

Create a character array with a specific string

Create an integer variable to hold the string length

Use a for loop to reverse the string into a new array

Print the reversed string

💡 Why This Matters

🌍 Real World

Reversing strings is useful in text processing, coding challenges, and creating palindromes or encryption.

💼 Career

Understanding string manipulation is fundamental for software developers, especially in areas like data processing, algorithms, and system programming.

1

Create the original string

Create a character array called original and initialize it with the exact string "hello".

DSA C

# Your code here

Hint

Use double quotes to create a string in C.

2

Calculate the string length

Create an integer variable called length and set it to the length of original using strlen(original). Include #include <string.h> at the top.

DSA C

char original[] = "hello";
// Your code here

Hint

Remember to include the string library to use strlen.

3

Reverse the string using a loop

Create a character array called reversed with size length + 1. Use a for loop with variable i from 0 to length - 1 to copy characters from original[length - 1 - i] to reversed[i]. After the loop, set reversed[length] to '\0' to end the string.

DSA C

#include 

char original[] = "hello";
int length = strlen(original);
// Your code here

Hint

Remember to add the null character at the end of the reversed string.

4

Print the reversed string

Use printf to print the string reversed.

DSA C

#include 

char original[] = "hello";
int length = strlen(original);
char reversed[length + 1];
for (int i = 0; i < length; i++) {
    reversed[i] = original[length - 1 - i];
}
reversed[length] = '\0';
// Your code here

Hint

Use printf("%s\n", reversed); to print the reversed string.