Write a menu driven program to a) Find the length of a string b) concatenate two strings c) to extract a substring from a given string d) Finding and replacing a string by another string in a text (Use pointers and user-defined functions)

#include

#include

#include

#include

#include

class string_manipulation

{

public:

void lenstr(char *);

void concatenate(char *, char *, char *);

int str_rep(char *, char *, int c[]);

void extract();

};

void string_manipulation::lenstr(char *p)

{

int len = 0;

while (*p++)

{

len ++;

}

cout << "The length of the string is : " <

}

void string_manipulation::concatenate(char *s1, char *s2, char *rs)

{

while (*s1)

{

*rs++ = *s1++;

}

while (*s2)

{

*rs++ = *s2++;

}

*rs = '\0';

}

void string_manipulation::extract()

{

char str1[ ] = "String1", str2[ ] = "String2" ;

int i, j, s, e;

clrscr();

cout << "Enter a string : " ;

gets(str1);

fflush(stdin);

cout << "Enter the starting points : " ;

cin >> s;

cout << "Enter the end points of string : " ;

cin >> e;

fflush(stdin);

for (i=s-1, j=0 ;i<=e ;i++, j++ )

{

str2[j] = str1[i];

}

str2[j] = '\0';

cout << str2;

getch();

}

int index_str1, index_str2, k;

int c[100];

int string_manipulation::str_rep(char *s1, char *s2, int c[ ])

{

int count = 0;

int i = 0,j , l = 0;

char s3[' '];

cout << "Enter the string to be replaced : " ;

gets(s3);

for (index_str1=0 ;s1[index_str1] ;index_str1++ )

{

for (index_str2=index_str1, k=0 ;(s1[index_str2]==s2[k])&&(s1[index_str1]) ;index_str2++, k++ )

{

if (!s2[k+1])

{

count++;

c[l++] = index_str1;

for (j=index_str1 ;j

{

s1[j] = s3[i++];

}

s1[j] = '\0';

cout << s1;

}

}

}

return(count);

}

void main()

{

string_manipulation obj;

int ch;

clrscr();

cout << "\nChoose any given option : ";

cout << "\n\t 1. String length" ;

cout << "\n\t 2. String concatenation" ;

cout << "\n\t 3. Extract string from given string";

cout << "\n\t 4. Find and replace string" ;

cout << "\n\t 5. Exit" ;

cout << "\n\nEnter your choice : " ;

cin >> ch;

switch (ch)

{

case 1: char str[80];

cout << "Enter a string : " ;

gets(str);

obj.lenstr(str);

break;

case 2: char str1[128];

char str2[128];

char output_str[257];

cout << "Enter the first sting : " ;

gets(str1);

cout << "\nEnter the second string : " ;

gets(str2);

obj.concatenate(str1, str2, output_str);

cout << "The concatenate string is : " ;

cout << output_str;

break;

case 3: obj.extract();

break;

case 4: char *s;

int c[100], count;

char s1[' '], s2[' '];

clrscr();

cout << "Enter the first sting : " ;

gets(s1);

cout << "Enter the sting to search : " ;

gets(s2);

obj.str_rep(s1, s2, c);

break;

case 5: exit(0);

default: cout << "\nInvalid choice" ;

}

getch();

}