c strings

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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C program to Encrypt and Decrypt a password

Posted on by Sandeepa Nadahalli
C Strings:
Write a C program to Encryption and Decryption of password.
In this program we encrypt the given string by subtracting the hex value from it. Password encryption is required for the security reason, You can use so many functions like hash or other keys to encrypt. Read more about C Programming Language . and read the C Programming Language (2nd Edition). by K and R. 
/***********************************************************
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* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact info@c-program-example.com
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* 
*                      Happy Coding
***********************************************************/

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

void encrypt(char password[],int key)
{
    unsigned int i;
    for(i=0;i<strlen(password);++i)
    {
        password[i] = password[i] - key;
    }
}

void decrypt(char password[],int key)
{
    unsigned int i;
    for(i=0;i<strlen(password);++i)
    {
        password[i] = password[i] + key;
    }
}
int main()
{
    char password[20] ;
    printf("Enter the password: n ");
    scanf("%s",password);
    printf("Passwrod     = %sn",password);
    encrypt(password,0xFACA);
    printf("Encrypted value = %sn",password);
    decrypt(password,0xFACA);
    printf("Decrypted value = %sn",password);
    return 0;
}
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C Program to check whether two strings are anagrams of each other.

Posted on by Sandeepa Nadahalli
C Strings:
Write a c program to check whether two strings are anagrams of each other.
Two strings are said to be anagrams, if the characters in the strings are same in terms of numbers and value ,only arrangement or order of characters are may be different.
Example: “dfghjkl” and “lkjghdf” are anagrams of each other.
Read more about C Programming Language . and read the C Programming Language (2nd Edition). by K and R.
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* 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 info@c-program-example.com
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>
#include<string.h>
# define NO_OF_CHARS 256
int Anagram(char *str1, char *str2)
{
    // Create two count arrays and initialize all values as 0
    int count1[NO_OF_CHARS] = {0};
    int count2[NO_OF_CHARS] = {0};
    int i;
    
    // For each character in input strings, increment count in
    // the corresponding count array
    for (i = 0; str1[i] && str2[i];  i++)
    {
        count1[str1[i]]++;
        count2[str2[i]]++;
    }
    
    // If both strings are of different length. Removing this condition
    // will make the program fail for strings like "aaca" and "aca"
    if (str1[i] || str2[i])
    return 0;
    
    // Compare count arrays
    for (i = 0; i < NO_OF_CHARS; i++)
    if (count1[i] != count2[i])
    return 0;

    return 1;
}
main()
{
    char str[100], str1[100];
    int flag = 0;
    
    printf("Enter first stringn");
    gets(str);
    
    printf("Enter second stringn");
    gets(str1);
    
    flag=Anagram(str, str1);
    if (flag==1)
    printf(""%s" and "%s" are anagrams.n", str, str1);
    else
    printf(""%s" and "%s" are not anagrams.n", str, str1);
    
    return 0;
}

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C Program to delete vowels in a string.

Posted on by Sandeepa Nadahalli
C Strings:
Write a C Program to delete a vowel in a given string.
In this program, We use the pointers to position the characters.check_vowel() function checks the character is vowel or not, if the character is vowel it returns true else false.
Example output:Given string: Check vowel
Output is: Chck vwl
Read more about C Programming Language . and read the C Programming Language (2nd Edition). by K and R. 

/***********************************************************
* 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 info@c-program-example.com
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<conio.h>
#define TRUE 1
#define FALSE 0

int check_vowel(char);

main()
{
    char string[100], *temp, *pointer, ch, *start;
    csrcscr();
    printf("nnEnter a stringn");
    scanf("%s",string);
    temp = string;
    pointer = (char*)malloc(100);

    if( pointer == NULL )
    {
        printf("Unable to allocate memory.n");
        exit(EXIT_FAILURE);
    }

    start = pointer;

    while(*temp)
    {
        ch = *temp;

        if ( !check_vowel(ch) )
        {
            *pointer = ch;
            pointer++;
        }
        temp++;
    }
    *pointer = '