char *strcpy (char *s1, const char *s2);

char *strncpy (char *s1, const char *s2, size_t n);

#include <iostream.h>

#include <string.h>

void main()

{

  char x[] = "Happy Birthday to You";

  char y[ 25 ];

  char z[ 15 ];

  strcpy( y, x ); // copy contents of x into y

  cout << "The string in array x is: " << x

       << "\nThe string in array y is: " << y << '\n';

  // copy first 14 characters of x into z

  strncpy( z, x, 14 ); // does not copy null character

  z[ 14 ] = '\0'; // append '\0' to z's contents

  cout << "The string in array z is: " << z << endl;

}

The string in array x is: Happy Birthday to You

The string in array y is: Happy Birthday to You

The string in array z is: Happy Birthday

char *strcat (char *s1, const char *s2);

char *strncat (char *s1, const char *s2, size_t n);

#include <iostream.h>

#include <string.h>

void main()

{

  char s1[ 20 ] = "Happy ";

  char s2[] = "New Year ";

  char s3[ 40 ] = "";

  cout << "s1 = " << s1 << "\ns2 = " << s2;

  strcat( s1, s2 ); // concatenate s2 to s1

  cout << "\n\nAfter strcat(s1, s2):\ns1 = " << s1 

       << "\ns2 = " << s2;

  // concatenate first 6 characters of s1 to s3

  // and places '\0' after last character

  strncat( s3, s1, 6 ); 

  cout << "\n\nAfter strncat(s3, s1, 6):\ns1 = " << s1 

       << "\ns3 = " << s3;

  strcat( s3, s1 ); // concatenate s1 to s3 

  cout << "\n\nAfter strcat(s3, s1):\ns1 = " << s1 

       << "\ns3 = " << s3 << endl;

}

s1 = Happy

s2 = New Year

After strcat(s1, s2):

s1 = Happy New Year

s2 = New Year

After strncat(s3, s1, 6):

s1 = Happy New Year

s3 = Happy

After strcat(s3, s1):

s1 = Happy New Year

s3 = Happy Happy New Year

int strcmp (const char *s1, const char *s2);

int strncmp (const char *s1, const char *s2, size_t n);

#include <iostream.h>

#include <string.h>

void main()

{

  char *s1 = "Happy New Year";

  char *s2 = "Happy New Year";

  char *s3 = "Happy Holidays";

  cout << "s1 = " << s1 << "\ns2 = " << s2

       << "\ns3 = " << s3 << "\n\nstrcmp(s1, s2) = " 

       << " " << strcmp( s1, s2 )

       << "\nstrcmp(s1, s3) = " << " "

       << strcmp( s1, s3 ) << "\nstrcmp(s3, s1) = "

       << " " << strcmp( s3, s1 );

  cout << "\n\nstrncmp(s1, s3, 6) = " << " "

       << strncmp(s1,s3,6) << "\nstrncmp(s1,s3,7) = "

       << " " << strncmp( s1, s3, 7 )

       << "\nstrncmp(s3, s1, 7) = "

       << " " << strncmp( s3, s1, 7 ) << endl;

}

s1 = Happy New Year

s2 = Happy New Year

s3 = Happy Holidays

strcmp(s1, s2) = 0

strcmp(s1, s3) = 6

strcmp(s3, s1) = -6

strncmp(s1, s3, 6) = 0

strncmp(s1, s3, 7) = 6

strncmp(s3, s1, 7) = -6

char *strtok (char *s1, const char *s2);

#include <iostream.h>

#include <string.h>

void main()

{

  char sentence[] ="This is a sentence with 7 tokens";

  char *tokenPtr;

  cout << "The string to be tokenized is:\n"<<sentence

       << "\n\nThe tokens are:\n\n";

  tokenPtr = strtok( sentence, " " );

  while ( tokenPtr != NULL ) {

    cout << tokenPtr << '\n';

    tokenPtr = strtok( NULL, " " ); // get next token 

  }

  cout <<"\nAfter strtok, sentence ="<<sentence<<endl;

}

The string to be tokenized is:

This is a sentence with 7 tokens

The tokens are:

This

is

a

sentence

with

7

tokens

After strtok, sentence = This

size_t strlen (const char *s);

#include <iostream.h>

#include <string.h>

void main()

{

char *string1 = "abcdefghijklmnopqrstuvwxyz";

char *string2 = "four";

char *string3 = "Boston";

cout << "The length of \"" << string1

     << "\" is " << strlen( string1 )

     << "\nThe length of \"" << string2

     << "\" is " << strlen( string2 )

     << "\nThe length of \"" << string3

     << "\" is " << strlen( string3 ) << endl;

}

The length of "abcdefghijklmnopqrstuvwxyz" is 26

The length of "four" is 4

The length of "Boston" is 6