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C, C++ Program to Reverse a String without using Strrev Function

Write a C , C++ program to reverse a string without using a string reverse function.  Given a input string, we have to reverse a string without using any in-built functions.

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Algorithm to Reverse a String


1.  Initialize a variable.


2. Take a input from user.


3. Count the length of a input string, As we are not using any in-built function.


4. Swap the position of an element.

C Program to Reverse a String


#include <stdio.h>
 
int main() {
 
       char str[100],  temp;
       int i, j = -1;
 
       // Take string input from user. 
   
       printf("Enter string");
       gets(str);
 
       i = 0;
  
       // count the length of a input string. 
   
       while(str[++j]!='\0');
   
        j = j - 1;
 
      /* Swap the positions of an element. */
  
      while (i < j) {
          temp = str[i];
          str[i] = str[j];
          str[j] = temp;
          i++;
          j--;
    }
 
     printf("Reverse of a input string is :%s", str);
     return (0);
}

Output

 Enter string :reverse string 

 Reverse a String using While Loop



#include <stdio.h>

int main()
{

    char str[] = "Reverseme";

    char reverse[100];

    int i=-1;
    int j=0;

         //Traverse a String Until it not reach at the end of string 

          while(str[++i]!='\0');
          

           while(i >= 0)
                  reverse[j++] = str[--i];
 
                 reverse[j] = '\0';

      printf("Reverse of  a string is %s",reverse);

      return 0;
}

Output - 

 Reverse of a string is emesreveR 

 C++ Program to Reverse a String

#include <iostream.h>

int main()
{

    char str[] = "Reverseme";

    char reverse[50];

    int i=-1;
    int j=0;

         /* Count the length, until it each at the end of string. */ 

          while(str[++i]!='\0');

           while(i>=0)
                    reverse[j++]=str[--i];
 
            reverse[j]='\0';

      cout<<"Reverse of  a string is"<< reverse;
      
      return 0;

}


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9 comments:

  1. Really Awesome Dude, Thanks for your help.

    ReplyDelete
  2. Thanks for helping us. Can you write a program to reverse a string in java.

    ReplyDelete
  3. #include
    #include
    #include
    void main()
    {
    clrscr();
    char str[100];
    int i=0,k=0;
    cout<<"enter any string"<<"\n";
    gets(str);
    for(i=0;str[i]!='\0';i++);
    k=i;
    while(k>=0)
    {
    putchar(str[k--]);
    }
    getch();
    }

    ReplyDelete