String Operations in C++

Problem Statement:-

Write C++ program with class for String. Write a function
· Copy, Concatenate, check substring, Equal, Reverse and Length.
· Frequency that determines the frequency of occurrence of particular
character in the string.
· Delete that accepts two integers, start and length. The function computes
a new string that is equivalent to the original string, except that length
characters being at start have been removed.
· Chardelete that accepts a character c. The function returns the string with
all occurrences of c removed.
· Replace to make an in-place replacement of a substring w of a string by
the string x. note that w may not be of same size of x
· Palindrome to check whether given string is palindrome or not

Code:-

	#include<iostream>
	#include<string>
	using namespace std;
	class String
	{
	int len;
	public:
	inline void display(char c[])
	{
	cout<<c;
	}
	int length(char *s)
	{
	int i=0;
	while(s[i]!='\0')
	{
	i++;
	}
	return i;
	}
	void copy(char *a,char *b)
	{
	int i=0;
	while(a[i]!='\0')
	{
	b[i]=a[i];
	i++;
	}
	b[i]='\0';
	}
	void concat(char *a,char *b)
	{
	int i=0;
	while(a[i]!='\0')
	i++;
	for(int j=0;b[j]!='\0';j++)
	{
	a[i]=b[j];
	i++;
	}
	a[i]='\0';
	}
	void search(char *a,char *b)
	{
	int len=length(b);
	int count,temp,flag=0;
	for(int i=0;a[i]!='\0';i++)
	{
	temp=i;
	count=0;
	for(int j=0;b[j]!='\0';j++)
	{
	if(a[temp]==b[j])
	{
	count++;
	}
	temp++;
	if(count==len)
	{
	cout<<"\n"<<b<<" is present at Location: "<<i+1;
	flag=1;
	}
	}
	}
	if(flag==0)
	cout<<endl<<b<<" is not present in "<<a<<endl;
	}
	void reverse(char *a)
	{
	int len=length(a);
	char temp;
	int j=len-1;
	for(int i=0;i<(len/2);i++)
	{
	temp=a[i];
	a[i]=a[j];
	a[j]=temp;
	j--;
	}
	}
	void compare(char *a,char *b)
	{
	int i=0;
	while(a[i]==b[i] && a[i]!='\0')
	i++;
	if(a[i]>b[i])
	cout<<endl<<a<<" is greater than "<<b<<endl;
	else if(a[i]<b[i])
	cout<<endl<<a<<" is less than "<<b<<endl;
	else
	cout<<"\n"<<a<<" is equal to "<<b<<endl;
	}
	int frequency(char *a,char ch)
	{
	int count=0;
	for(int i=0;a[i]!='\0';i++)
	{
	if(a[i]==ch)
	count++;
	}
	return count;
	}
	void deleteS(char *a,int start,int l)
	{
	int i=start-1;
	while(a[i]!='\0')
	{
	a[i]=a[i+l];
	i++;
	}
	}
	void delChar(char *a,char ch)
	{
	for(int i=0;a[i]!='\0';i++)
	{
	if(a[i]==ch)
	{
	int j=i;
	while(a[j]!='\0')
	{
	a[j]=a[j+1];
	j++;
	}
	a[j]='\0';
	}
	}
	}
	bool palindrome(char *a)
	{
	char rev[50];
	copy(a,rev);
	reverse(rev);
	int len=length(a);
	int count=0;
	for(int i=0;a[i]!='\0';i++)
	{
	if(a[i]==rev[i])
	count++;
	}
	if(count==len)
	return true;
	else
	return false;
	}
	};
	int main()
	{
	char str[50],str2[50],ch;
	String s1;
	int choice,start,len;
	bool flag;
	do
	{
	cout<<"\nString Operations:\n1.length\n2.copy\n3.concatenate\n4.SEARCH sUBSTRING.\n5.Reverse"
	<<"\n6.Compare Strings\n7.Frequency of character\n8.Delete from string by givinfg locations"
	<<"\n9.Delete occurance of characher\n10.Check Palindrome\nEnter choice:";
	cin>>choice;
	switch(choice)
	{
	case 1:
	cout<<"Enter String:";
	cin>>str;
	cout<<"\nLength: "<<s1.length(str);
	break;
	case 2:
	cout<<"Enter String:";
	cin>>str;
	s1.copy(str,str2);
	cout<<"Copied String:"<<str2;
	break;
	case 3:
	cout<<"Enter String:";
	cin>>str;
	cout<<"\nENter String to concatenate: ";
	cin>>str2;
	s1.concat(str,str2);
	cout<<"\nAfter Concatenate: "<<str;
	break;
	case 4:
	cout<<"Enter String:";
	cin>>str;
	cout<<"\nENter String to search: ";
	cin>>str2;
	s1.search(str,str2);
	break;
	case 5:
	cout<<"Enter String:";
	cin>>str;
	s1.reverse(str);
	cout<<"\nReverse : "<<str;
	break;
	case 6:
	cout<<"Enter String:";
	cin>>str;
	cout<<"\nENter another string";
	cin>>str2;
	s1.compare(str,str2);
	break;
	case 7:
	cout<<"Enter String:";
	cin>>str;
	cout<<"\nEnter char to find freq: ";
	cin>>ch;
	cout<<"\nFrequency of "<<ch<<" is :"<<s1.frequency(str,ch);
	break;
	case 8:
	cout<<"Enter String:";
	cin>>str;
	cout<<"Enter start and length to delete chars from string: ";
	cin>>start>>len;
	s1.deleteS(str,start,len);
	cout<<"\nAfter Deleting: "<<str;
	break;
	case 9:
	cout<<"Enter String:";
	cin>>str;
	cout<<"Enter chracter to delete its occurences: ";
	cin>>ch;
	s1.delChar(str,ch);
	cout<<"After Deletion: "<<str;
	break;
	case 10:
	cout<<"Enter String:";
	cin>>str;
	if(s1.palindrome(str))
	cout<<endl<<str<<" is palindrome.";
	else
	cout<<endl<<str<<" is not palindrome.";
	break;
	}
	}while(choice!=0);
	return 0;
	}

view raw StringOperations.CPP hosted with ❤ by GitHub

Output:-