DSL

5: Problem Statement:

Write C++ program for string operations- copy, concatenate, check substring, equal, reverse and length

#include<iostream>

#include<cstdio>

using namespace std;

int Length(char str[50])

{

int count=0,i=0;

while(str[i]!='\0')

{

count++;

i++;

}

return count;

}

void Palindrome(char str[50])

{

int k=Length(str)-1;

int i,p=0;

while(str[i]!='\0')

{

if(str[i++]==str[k--]){

p=1;

break;

}

}

if(p==1)

{

printf("Entered string is Palindrome\n");

}

else{

printf("Entered string is not palindrome\n");

}

}

void copy_string(char str[50])

{

char ch[50];

printf("Enter second string which you want to copy!!\n");

scanf("%s",ch);

int i=0;

while(str[i]!='\0')

{

str[i]=ch[i];

i++;

}

printf("copied string is : %s \n",str);

}

void Reverse(char str[50])

{

int k=Length(str)-1;

printf("\nReversal of string is : ");

for(int i=k;i>=0;--i){

cout<<str[i];

}

cout<<endl;

}

void string_comparison(char str[50])

{

char ch[30];

printf("Enter string which you want to compare!\n");

scanf("%s",ch);

int i = 0;

while (str[i] == ch[i] && str[i] != '\0')

i++;

if (str[i] > ch[i])

printf("String first is greater than second.\n");

else if (str[i] < ch[i])

printf("String second is greater than first.\n");

else

printf("str1 and str2 are equal.\n");

}

void sub_string(char str[50])

{

char search[10];

int count1 = 0, count2 = 0, i, j, flag;

printf("Enter search substring:");

cin>>search;

count1=Length(str);

count2=Length(search);

for (i = 0; i <= count1 - count2; i++)

{

for (j = i; j < i + count2; j++)

{

flag = 1;

if (str[j] != search[j - i])

{

flag = 0;

break;

}

}

if (flag == 1)

break;

}

if (flag == 1)

printf("String Found!\n");

else

printf("String not Found");

}

int main()

{

int ch;

char str[50];

printf("Enter string \n");

scanf("%s",str);

do{

cout<<"\n******MENU******\n";

cout<<" 1.Length of string\n 2.Palindrome\n 3.Copy_String\n 4.Reverse string\n";

printf(" 5.String Comparison\n 6.Substring\n");

cout<<"Enter your choice\n";

cin>>ch;

switch(ch)

{

case 1:

cout<<"Length of entered string is = "<<Length(str)<<" \n";

break;

case 2:

Palindrome(str);

break;

case 3:

copy_string(str);

break;

case 4:

Reverse(str);

break;

case 5:

string_comparison(str);

break;

case 6:

sub_string(str);

break;

}

}

while(ch>=0&&ch<=6);

}