string reverse

Write a C program to reverse a string using pointers.

Posted on by Sandeepa Nadahalli
C Strings:
Write a C program to reverse a string using pointers.
In this program, we reverse the given string by using the pointers. Here we use the two pointers to reverse the string, strptr holds the address of given string and in loop revptr holds the address of the reversed string.
Read more about C Programming Language . and read the C Programming Language (2nd Edition). by K and R. 

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#include<stdio.h>
int main(){
    int i=-1;
    char str[100];
    char rev[100];
    char *strptr = str;
    char *revptr = rev;
    printf("Enter the string:n");
    scanf("%s",str);
    while(*strptr)
    {
        strptr++;
        i++;
    }
    while(i >=0) {
        strptr--;
        *strptr = *revptr;
        revptr++;
        --i;
    }
    printf("nn Reversed string is:%s",rev);
    return 0;
}

 
  
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K & R C Programs Exercise 1-19

Posted on by Sandeepa Nadahalli
K and R C, Solution to Exercise 1-19:
Write a function reverse(str) that reverses the character string str. Use it to write program that reverse thes its input a line at a time. K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language, second addition, by Brian W.Keringhan and Dennis M.Ritchie(Prentice Hall,1988). You can learn and solve K&R C Programs Exercise. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include "stdio.h"

#define MAXINLINE 1000 /* maximum input line size */

int get_lines(char line[], int maxline);
void reverse(char str[]);

/* print longest input line */
main() {

 char line[MAXINLINE]; /* current input line */

 while ((get_lines(line, MAXINLINE)) > 0) {

  reverse(line);
  printf("%s", line);

 }

}

/* getline: read a line into s, return length */
int get_lines(char str[], int line) {
 int c, i, j;

 for (i = 0, j = 0; (c = getchar()) != EOF && c != 'n'; ++i) {
  if (i < line - 1) {
   str[j++] = c;
  }
 }
 if (c == 'n') {
  if (i <= line - 1) {
   str[j++] = c;
  }
  ++i;
 }
 str[j] = '';
 return i;
}

/*reverse the string str*/
void reverse(char str[]) {
 int i, j;
 char temp;
 i = 0;
 while (str[i] != '')
  ++i;
 --i;
 if (str[i] != 'n')

  --i;
 j = 0;
 while (j < i) {
  temp = str[j];
  str[j] = str[i];
  str[i] = temp;
  --i;
  ++j;
 }
}

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C program to check whether a given string is palindrome or not

Posted on by Sandeepa Nadahalli
Write a C program to read a string and check whether it is a palindrome or not (without using library functions). Output the given string along with suitable message.Palindrome is a word, sentence, group of characters, or number, that remains same, when reversed.
For example: GADAG, 9009… Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                                  Happy Coding
***********************************************************/

#include <stdio.h>
#include <conio.h>
#include <string.h>

void main()
{
 char string[25], revString[25]={''};
 int  i,length = 0, flag = 0;

 clrscr();

 fflush(stdin);

 printf("Enter a stringn");
 gets(string);

 for (i=0; string[i] != ''; i++) /*keep going through each */
 {                                 /*character of the string */
  length++;                     /*till its end */
 }

 for (i=length-1; i >= 0 ; i--)
 {
  revString[length-i-1] = string[i];
 }

 /*Compare the input string and its reverse. If both are equal
   then the input string is palindrome. Otherwise it is
   not a palindrome */

 for (i=0; i < length ; i++)
 {
  if (revString[i] == string[i])
   flag = 1;
  else
   flag = 0;
 }

 if (flag == 1)
  printf ("%s is a palindromen", string);
 else
  printf("%s is not a palindromen", string);

}   /*End of main()*/
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