C Program to find all the permutations of a given string.

Posted on April 1, 2012 by Sandeepa Nadahalli

Write a c program to find all the permutations of a given string.
Example: If the given string is sam, output is,
sam
sma
msa
mas
asm
ams.
Read more about C Programming Language .

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***********************************************************/

# include<stdio.h>
# include<conio.h>
#include<string.h>
void swap (char *x, char *y)
{
    char temp;
    temp = *x;
    *x = *y;
    *y = temp;
}

void permute(char *a, int i, int n)
{
    int j;
    if (i == n)
    printf("%sn", a);
    else
    {
        for (j = i; j <= n; j++)
        {
            swap((a+i), (a+j));
            permute(a, i+1, n);
            swap((a+i), (a+j));
        }
    }
}


int main()
{
    char str[80] ;
    int len=0,i;
    puts("Enter a string:nn");
    gets(str);
    for (i=0; str[i] != ''; i++)
    {
        len++;
    }
    permute(str, 0, len);
    getchar();
    return 0;
}

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K & R C Programs Exercise 5-5.

Posted on January 26, 2012 by Sandeepa Nadahalli

K and R C, Solution to Exercise 5-5:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
C Program to write the versions of the library functions strncpy, strncat, and strncmp, which operate on at most the first n characters of their argument strings.
For example, strncpy(s, t, n) copies at most n characters of t to s. 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
***********************************************************/

/*strncpy: copy n characters from t to s*/
void strncpy(char *s, char *t, int n)
{
 while(*t && n--> 0)
  *s++ = *t++;
 while( n--> 0)
  *s++ = '';
}

/*strncat: concatenate n characters of t to end of s*/
void strncat(char *s, char *t, int n)
{
 void strncpy(char *s, char *t, int n);
 int strlen(char *);
 strncpy(s+strlen(s), t, n);
}

/*strncmp: comapre at most n characters of t with s */
int strncmp(char *s, char *t, int n)
{
 for( ; *s == *t; s++, t++)
  if(*s == '' || --n <= 0)
  {
   return 0;
  }
 return *s - *t;
}

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C Program to count the number of occurrences of particular word in a string

Posted on October 20, 2011June 25, 2017 by Sandeepa Nadahalli

C Program that counts the particular word in the given string. For example in the string ” the string is the set of charterers” , Number of occurrences of “the” is:2. 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<string.h>

main()

{

 int strln,wordln,i,j,k,flag,count=0;

 char str[200],word[20];

 printf("Enter line of text:n");

 gets(str);

 printf("Enter the word to count:n");

 scanf("%s",word);

 strln=strlen(str);

 wordln=strlen(word);

 for(i=0;i<strln;i++)

 {

  if(str[i]==word[0]&&((str[i-1]==' '||i==0)&&(str[i+wordln]==' '||str[i+wordln]=='')))

  {

   for(flag=0,k=i+1,j=1;j<wordln;j++,k++)

   {

    if(str[k]==word[j])

    {

     flag++;

    }

   }

   if(flag==wordln-1)

   {

    count++;

   }

  }

 }

 printf("Number of occurence of '%s' = %dn",word,count);

}

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C Program to implement strlen function

Posted on October 3, 2011 by Sandeepa Nadahalli

Write a c program to find the length of a string without using the built-in function strlen(). Program will calculate the length of the string using for loop by going through each character of the string, till its end. 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>

void main()
{
 char string[50];
 int  i, length = 0;

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

 for (i=0; string[i] != ''; i++) /*keep going through each */
 {                                 /*character of the string */
  length++;                     /*till its end */
 }
 printf("The length of a string is the number of characters in itn");
 printf("So, the length of %s =%dn", string, length);
}

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