- C Programming Examples
- C Programming Examples
- C Print Hello World
- C Get Input from User
- C Print Integer
- C Add Two Numbers
- C Add Subtract Multiply Divide
- C Add n Numbers
- C Area Perimeter of Square
- C Area Perimeter of Rectangle
- C Area Circum of Circle
- C Fahrenheit to Celsius
- C Celsius to Fahrenheit
- C Inches to Centimeters
- C Kilogram to Gram
- C Reverse a Number
- C Swap Two Numbers
- C Interchange Numbers
- C Print ASCII Value
- C Print Fibonacci Series
- C Check Palindrome or Not
- C Check Armstrong or Not
- C Find Armstrong Numbers
- C Find nCr and nPr
- C Find Profit Loss
- C Sum of their Square
- C First & Last Digit Sum
- C Sum of All Digit
- C Product of All Digit
- C Print Total Digit in Number
- C Check Perfect Number
- C Find Basic Gross Salary
- C Round Number to Integer
- C Print Series upto n Term
- C Find Factors of Number
- C if-else & Loop Programs
- C Check Even or Odd
- C Check Prime or Not
- C Check Alphabet or Not
- C Check Vowel or Not
- C Check Leap Year or Not
- C Is Reverse Equal Original
- C Make Calculator
- C Add Digits of Number
- Count Positive Negative Zero
- C Largest of Two Numbers
- C Largest of Three Numbers
- C Smallest of Two Numbers
- C Smallest of Three Numbers
- C Find Factorial of Number
- C Find LCM & HCF
- C Find LCM of n Numbers
- C Find HCF of n Numbers
- C Find Arithmetic Mean
- C Find Average, Percentage
- C Find Student Grade
- C Print Table of Number
- C Print Prime Numbers
- C Find Discount Purchase
- C Calculate Parcel Charge
- C Calculate Wage of Labor
- C Print Phone Bill
- C Conversion programs
- C Decimal to Binary
- C Decimal to Octal
- C Decimal to Hexadecimal
- C Binary to Decimal
- C Binary to Octal
- C Binary to Hexadecimal
- C Octal to Decimal
- C Octal to Binary
- C Octal to Hexadecimal
- C Hexadecimal to Decimal
- C Hexadecimal to Binary
- C Hexadecimal to Octal
- C Pattern Programs
- C Pattern Printing Programs
- C Print Diamond Pattern
- C Print Floyd's Triangle
- C Print Pascal's Triangle
- C Array Programs
- C 1D Array Programs
- C Linear Search
- C Binary Search
- C Largest Element in Array
- C Smallest Element in Array
- C Second Largest/Smallest
- C Count Even Odd
- C Array Element at Even
- C Array Element at Odd
- C Print Even Array Elements
- C Print Odd Array Elements
- C Sum/Product of Even/Odd
- C Reverse an Array
- C Insert Element in Array
- C Delete Element from Array
- C Merge Two Arrays
- C Bubble Sort
- C Selection Sort
- C Insertion Sort
- C Print Common Elements
- C 2D Array Programs
- C Add Two Matrices
- C Subtract Two Matrices
- C Transpose a Matrix
- C Multiply Two Matrices
- C Sum All Matrix Elements
- C Largest Element in Matrix
- C Print Row Column Total
- C 3D Array Programs
- C String Programs
- C Print String
- C Find Length of String
- C Compare Two String
- C Copy a String
- C Concatenate String
- C Reverse a String
- C Count Vowels Consonants
- C Replace Vowel in String
- C Delete Vowels from String
- C Delete Word from String
- C Frequency of Character
- C Count Word in String
- C Remove Spaces from String
- C Sort a String
- C Sort String in Alphabetical
- C Sort Words in Ascending
- C Sort Words in Descending
- C Uppercase to Lowercase
- C Lowercase to Uppercase
- C Swap Two Strings
- C Check Anagram or Not
- C Check Palindrome String
- C Print Number in Words
- C Print Successive Character
- C Character without Space
- C File Programs
- C Read a File
- C Write Content to File
- C Read & Display File
- C Copy a File
- C Merge Two Files
- C Reverse File
- C Count All Character in File
- C List Files in Directory
- C Encrypt & Decrypt a File
- C Delete a File
- C Misc Programs
- Generate Random Numbers
- C Print Date Time
- C Print Message with Time
- C Get IP Address
- C Print Smiling face
- C Pass Array to Function
- Add Two Numbers using Pointer
- C Address of Variable
- C Shutdown Computer
- C Programming Tutorial
- C Tutorial
C Program to Reverse a String
In this tutorial, you will learn and get code for reversing a string in C. Reversing a string means
- The first character of the string is transferred to the last, and the last character is transferred back to the first.
- Similarly, the second character is assigned to the second last, and the second last character is assigned to the second.
- and so on.
For example, if the given string is "codescracker," then its reverse will be "rekcarcsedoc."
C Print the Reverse of a String
This program just prints the given string in reverse order without actually reversing it.
#include<stdio.h> #include<conio.h> int main() { char str[50], i, j, count=0; printf("Enter any string: "); gets(str); for(i=0; str[i]!='\0'; i++) count++; for(j=(count-1); j>=0; j--) printf("%c", str[j]); getch(); return 0; }
This program was built and run in the Code::Blocks IDE. The following snapshot shows the output:
Provide any string, say "codescracker," and press the ENTER key to see the string in reverse order:
Consider another scenario in which the user enters any string containing spaces, such as "codes cracker dot com."
Program Explained
Here is a list of some of the main steps used in the above program:
- Receive any string as input from the user at run-time.
- Calculate the length of the string using a for-loop that runs from the first character of the string to the last character of the string. The last character present before the null-terminated character ('\0')
- Now create a for loop that starts with the last character of the string and ends with the first character of the string.
- Print the string character by character, starting with the last character, then the second last character, the third last character, and so on until you reach the first character.
- In this way, you will get the string in reverse order as output.
C Reverse a String
Now this program actually reverses the given string first and then prints it as output:
#include<stdio.h> #include<conio.h> #include<string.h> int main() { char str[100], temp; int i=0, j; printf("Enter the String: "); gets(str); i=0; j=strlen(str)-1; while(i<j) { temp = str[i]; str[i] = str[j]; str[j] = temp; i++; j--; } printf("\nReverse of the String is:\n%s", str); getch(); return 0; }
Here is the first sample run:
Here is another sample run:
Program Explained
Here are some of the main steps used in the above program:
- Accept any string
- Because indexing begins at 0, initialize 0 to any variable, say i, that represents the first character of the string.
- Get the length of the string using the strlen() function and initialize the length of the string minus one to any variable, say j, that represents the last character of the string initially.
- Now create a while loop that runs until i is less than j.
- Now, inside any temporary variable, say temp, initialize the first character, then place the last character at the first character and the first character (the "temp" variable holds the first character) at the last character, and increment the value of i and decrement the value of j.
- Now i holds the second character, and j holds the second last character.
- Replace each other.
- Continue doing this until all the characters are reversed.
- After coming out of the while loop, print the value of string, which will be the reverse of the original string.
The same program in different languages
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