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1. Introduction
Reversing a string is a classic coding challenge and is often asked in interviews. Even though C has ready-made functions for this, it's key to know how it works underneath. This guide explains a C program that reverses a string without library functions.
2. Program Overview
This program will:
1. Get the input string from the user.
2. Reverse the string.
3. Show the reversed string to the user.
3. Code Program
#include <stdio.h> // For input and output
int main() { // Start of the program
char str[100], temp; // Storage for the string and a helper variable
int start = 0, end; // Markers for the start and end of the string
// Get the string from the user
printf("Enter the string: ");
scanf("%s", str);
// Find out how long the string is
for (end = 0; str[end] != '\0'; end++);
// Make 'end' point to the last letter
end--;
// Flip the string
while (start < end) {
temp = str[start];
str[start] = str[end];
str[end] = temp;
start++;
end--;
}
printf("Reversed string is: %s\n", str); // Show the flipped string
return 0; // End the program
}
Output:
Enter the string: javaguides Reversed string is: sediugavaj
4. Step By Step Explanation
1. #include <stdio.h>: This gets us the functions for input and output.
2. int main(): Where our program starts running.
3. Variables:
- str holds the string.
- temp helps in switching letters around
.- start and end point to the beginning and end of the string.
4. Getting the String:
- printf asks the user for a string
- scanf saves that string in str.
5. Finding the Length:
- A loop counts the letters in the string. When it's done, the end tells us how many there are.
6. Fixing end:
- We subtract one from the end to make it point to the last letter.
7. Flipping the String:
- A loop switches the letters from start to end until the string is reversed.
8. Showing the Result:
- printf displays the reversed string.
This example helps us see how flipping a string in C really works, especially the way we switch letters around.
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