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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 [email protected]
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* and browse!
* 
*                      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 demonstrate modf function.

Posted on by Sandeepa Nadahalli
Write a C program to demonstrate modf function.modf() defined in the C math.h library.
modf function breaks the double/float values to integral part and fractional part. 
Example: res = modf(3.142, &iptr) returns res=142 and iptr=3. 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 [email protected]
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* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>
#include<math.h>
#include<conio.h>
int main()
{
    double num,integral,result;
    clrscr();
    printf("n Enter fractional Numbern");
    scanf("%lf",&num);
    result = modf(num, &integral);
    
    printf("%.4lf = %.4lf + %.4lfn", num, integral, result);
    
    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 [email protected]
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* 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 check matrix is magic square or not

Posted on by Sandeepa Nadahalli

Write a c program to check whether the given matrix is a magic square matrix or not.

A matrix is magic square matrix, if all rows sum, columns sum and diagonals sum are equal.

Example:
8   1   6
3   5   7
4   9   2

is the magic square matrix. As you can see numbers in first row add up to 15 (8 + 1 + 6), so do the numbers of 2nd row 3 + 5 + 7. Also the number in the last row 4 + 9 + 2. Similarly, the columns all add up to the same number 15. Hence, this matrix is a magic square matrix.

The Program

#include <stdio.h>
void main() {
int A[50][50];
int i, j, M, N;
int size;
int rowsum, columnsum, diagonalsum;
int magic = 0;
printf("Enter the order of the matrix:\n");
scanf("%d %d", &M, &N);
if(M==N) {
printf("Enter the elements of matrix \n");
for(i=0; i<M; i++) {
for(j=0; j<N; j++) {
scanf("%d", &A[i][j]);
}
}
printf("\n\nMATRIX is\n");
for(i=0; i<M; i++) {
for(j=0; j<N; j++) {
printf("%3d\t", A[i][j]);
}
printf("\n");
}
// calculate diagonal sum
diagonalsum = 0;
for(i=0; i<M; i++) {
for(j=0; j<N; j++) {
if(i==j) {
diagonalsum = diagonalsum + A[i][j];
}
}
}
// calculate row sum
for(i=0; i<M; i++) {
rowsum = 0;
for(j=0; j<N; j++) {
rowsum = rowsum + A[i][j];
}
if(rowsum != diagonalsum) {
printf("\nGiven matrix is not a magic square");
return;
}
}
// calculate column sum
for(i=0; i<M; i++) {
columnsum = 0;
for(j=0; j<N; j++) {
columnsum = columnsum + A[j][i];
}
if(columnsum != diagonalsum) {
printf("\nGiven matrix is not a magic square");
return;
}
}
printf("\nGiven matrix is a magic square matrix");
} else {
printf("\n\nPlease enter the square matrix order(m=n) \n\n");
}
}
view raw magic_square.c hosted with ❤ by GitHub

Sample Output

Read more about C Programming Language and read the C Programming Language (2nd Edition). by K and R.

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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.

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* 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<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 = '';
    
    pointer = start;
    strcpy(string, pointer); /* If you wish to convert original string */
    free(pointer);
    
    printf("String after removing vowels is "%s"n", string);
    
    return 0;
}

int check_vowel(char a)
{
    if ( a >= 'A' && a <= 'Z' )
    a = a + 'a' - 'A';
    
    if ( a == 'a' || a == 'e' || a == 'i' || a == 'o' || a == 'u')
    return TRUE;
    
    return FALSE;
}
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C program to demonstrate ceil function.

Posted on by Sandeepa Nadahalli
Write a C program to demonstrate ceil function.ceil is in the C math.h library.
ceil function rounds up the smallest next integral value.
Example:ceil(2.0) is 2.0
ceil(2.1) is 3.0
ceil(2.2) is 3.0
—
—
ceil(2.9) is 3.0
Read more about C Programming Language.

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* for personal and learning purposes. For permissions to use the
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* and browse!
* 
*                      Happy Coding
***********************************************************/




#include<stdio.h>
#include<math.h>
#include<conio.h>
int main()
{
    double number, result;
    clrscr();
    printf("Enter a number to round it upn");
    scanf("%lf",&number);
    
    result = ceil(number);
    
    printf("nOriginal number =  %lfn", number);
    printf("nNumber rounded up = %lfn", result);
    getch();
    return 0;
} 
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C Program to demonstrate how the escape characters work.

Posted on by Sandeepa Nadahalli
C Program to demonstrate how the escape characters work.Escape character is the single character, and it is compiled as the character constant.
Escape characters are used to solve the c format problems.
An escape sequence is denoted by using the backslash () as an escape character, followed by a single character indicating the nonprintable character desired.
Read more about C Programming Language . 

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* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
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* and browse!
* 
*                      Happy Coding
***********************************************************/

   #include <stdio.h>
   #include <conio.h>
   main()
    {
      clrscr();
      printf("Escape operators");

      printf("Example program to show the escape characters:nn");
      printf("t here is tab");
      printf("n Here starts new line");
      getch();
    }

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C program to Demonstrate the Recursive function.

Posted on by Sandeepa Nadahalli
Write a C program to demonstrate the recursive function.
Recursion  is the programming technique that a process invoking itself again and again. In this program, We reverse the given number and checks it is a palindrome or not. Read more about C Programming Language .

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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 [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

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

int main(){
 clrscr();
 int num,num1,rev;
 printf("nEnter a number :n");
 scanf("%d",&num);
 num1=num;
 //call recursive function
 rev=reverse(num);

 printf("nAfter reverse the number is :n%d",rev);
 if(num1==rev){
  printf("nnNumber  %d is Palindromen",num1);
 }else
 {
  printf("nnNumber  %d is NOT a Palindromen",num1);
 }

 return 0;
}
int sum=0,r;
reverse(int num){
 if(num){
  r=num%10;
  sum=sum*10+r;
  reverse(num/10);
 }
 else
  return sum;
 return sum;
}

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C program to count the leaves of the binary tree.

Posted on by Sandeepa Nadahalli
Write a C program to count the leaves of the binary tree.
Binary tree is the ordered directed tree data structure, in which each node has at most two nodes.
A node is called as a leaf node,  if it does not contains any child elements. In this program, We used the structures to create the binary tree.
Read more about C Programming Language .

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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 [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

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

struct node
{
 int data;
 struct node* leftnode;
 struct node* rightnode;
};

//get the leaves count
unsigned int getLeafCount(struct node* node)
{
 if(node == NULL)
  return 0;
 if(node->leftnode == NULL && node->rightnode==NULL)
  return 1;
 else
  return getLeafCount(node->leftnode)+
    getLeafCount(node->rightnode);
}


struct node* newNode(int data)
{
 struct node* node = (struct node*)
  malloc(sizeof(struct node));
 node->data = data;
 node->leftnode = NULL;
 node->rightnode = NULL;

 return(node);
}


int main()
{

 clrcsr();
 struct node *root = newNode(1);
 root->leftnode = newNode(2);
 root->rightnode = newNode(3);
 root->leftnode->leftnode = newNode(4);
 root->leftnode->rightnode = newNode(5); 


 printf("nnLeaf count of the binary tree is %d", getLeafCount(root));

 getch();
 return 0;
}


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C Program to implement hashing.

Posted on by Sandeepa Nadahalli
Write a C Program to implement hashing.
Hashing is the function or routine used to assign the key values to the each entity in the database. Using hashing, We can easily access or search the values from database.
In this program we used the open addressing hashing, also called as closed hashing.
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>
void main() {
 int a[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
 int n, value;
 int temp, hash;
 clrscr();
 printf("nEnter the value of n(table size):");
 scanf("%d", &n);
 do {
  printf("nEnter the hash value");
  scanf("%d", &value);
  hash = value % n;
  if (a[hash] == 0) {
   a[hash] = value;
   printf("na[%d]the value %d is stored", hash, value);
  } else {
   for (hash++; hash < n; hash++) {
    if (a[hash] == 0) {
     printf("Space is allocated give other value");
     a[hash] = value;
     printf("n a[%d]the value %d is stored", hash, value);
     goto menu;
    }
   }

   for (hash = 0; hash < n; hash++) {
    if (a[hash] == 0) {
     printf("Space is allocated give other value");
     a[hash] = value;
     printf("n a[%d]the value %d is stored", hash, value);
     goto menu;
    }
   }
   printf("nnERRORn");
   printf("nEnter '0' and press 'Enter key' twice to exit");

  }

  menu:

  printf("n Do u want enter more");

  scanf("%d", &temp);

 }

 while (temp == 1);

 getch();

}

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