CODEWITHSUNDEEP
c++string
Franky N.
Franky N.

Reputation: 79

How to can i do this using c++

I have the following code:

int main()
{
    string  adr="bonjour000000";
    int j=adr.length();
    cout<<adr<<"\nLa longueur de ma chaine est "<<j<<".";
    cout<<"\n";

    if(adr.length()>=7){
        //if(how to test if the characters after the 7th character are =0)
        //here begin the 2nd if loop

        for(unsigned int i=0; i<adr.length(); i++)
        {
            cout<<adr[i];
        }

        adr.erase (adr.begin()+7,adr.end());
        cout<<"\n"<<adr;

        //here ends the 2nd if loop
    }

    else{
        cout<<"Error: there is less than 7 characters";
        cout<<"\n"<<adr;
    }
}

I want to test first if adr has 7 or more than 7 characters, then I want to check if all the characters after the 7th characters are all = 0. When this is the case, I would like to cut all these 0, and when not, keep adr as it is. With my example, I expected this output:

bonjour000000
La longueur de ma chaine est 13
bonjour000000
bonjour

Thanks for your help.

Upvotes: 0

Views: 136

Answers (2)

Luchian Grigore
Luchian Grigore

Reputation: 258568

The following:

bool condition = (adr.length() > 7) &&
                 (adr.find_first_not_of('0', 7) == std::string::npos);

Upvotes: 3

Karthik T
Karthik T

Reputation: 31952

You can use std::string::find_first_not_of to check for the first char that is not a '0'. If there is no such character within the string bounds all of the characters are 0. You will call this on a substring that starts after char #7. You can call it with the starting position as well as @Luchian Grigore has shown

Upvotes: 3

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