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Function of string.cpp
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Function of string.cpp
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#include<bits/stdc++.h>
#define sync ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define ll long long
using namespace std;
int main()
{
//sync;
string s;
cin>>s;
cout<< "Size of string = "<< s.size() << "\n";
cout<< s << endl;
sort(s.begin(),s.end());
cout<< "After sorting : ";
cout<< s << "\n";
reverse(s.begin(),s.end());
cout<< "After reverse : "<<s << "\n";
//s = takia
string ans = s.substr(0,3); /// 0 theke sure kore total 3ta character
cout<< ans << endl;///tki
string ans1 = s.substr(2,3); /// 0 theke sure kore total 3ta charcter
cout<< ans1 << "\n"; ///kia
cin.ignore();
//input with space
string s1;
getline(cin,s1);
cout<< s1 << "\n";
//toupper
for(int i=0; i<s1.size(); i++){
char ch = toupper(s1[i]);
cout<< ch;
} cout<< "\n";
//tolower
for(int i=0; i<s1.size(); i++){
char ch = tolower(s1[i]);
cout<< ch;
} cout<< "\n";
///istringstream-from sentence print word
istringstream iss(s1);
string word;
while(iss>>word) cout<< word << "\n";
//erase()
s1.erase(s1.begin()+0); /// first char delete
cout<< s1 << "\n";
s1.erase(s1.begin()+3); ///4th char delete
cout<< s1 << endl;
///pop_back()
cout<< "After pop_back : ";
s1.pop_back();
cout<<s1 << "\n";
///push_back()
s1.push_back('^');
cout<< s1 << endl;
return 0;
}