Can anybody suggest best book to buy for learning programming for beginners . I am new in this group plz help

Not, it not type safe

Can anybody suggest best book to buy for learning programming for beginners . I am new in this group plz help

my principal, there's many good reads on the internet and all of it are free...

http://www.cplusplus.com/doc/tutorial/

Thnx

#include<iostream> #include<fstream> #include<string> #include<math.h> using namespace std; int main() { ifstream obj("student.csv"); if(!obj.is_open()) std::cout<<"File Open "<<endl; int avg,total,eng,mat,sci; string name; string english; eng=stoi(english); string math; mat=stoi(math); string science; sci=stoi(science); while(obj.good()) { getline(obj,name,','); getline(obj,english,','); getline(obj,math,','); getline(obj,science); total=(eng+mat+sci); cout<<name<<" Your total Marks are :"<<total; } }

which compiler are you using? This should compile with a c++11 compiler. std::stoi was introduced in C++11

codeblocks

#include<iostream> #include<fstream> #include<string> #include<math.h> using namespace std; int main() { ifstream obj("student.csv"); if(!obj.is_open()) std::cout<<"File Open "<<endl; int avg,total,eng,mat,sci; string name; string english; eng=stoi(english); string math; mat=stoi(math); string science; sci=stoi(science); while(obj.good()) { getline(obj,name,','); getline(obj,english,','); getline(obj,math,','); getline(obj,science); total=(eng+mat+sci); cout<<name<<" Your total Marks are :"<<total; } }

Ok

how can I know about my compiler?

codeblocks

Yup I am waiting 😊

terminate called after throwing an instance of 'std::invalid_argument' what(): stoi

Why mobile/android tho?

Sure

You can program in C++ on Android with ndk, but i council to use only Java for Android and use C++ only for the optimization of the app

🙏👍 i appriciate your tips

I would suggest using Xamarine actually, it's easier than C++ and uses NDK so it's faster.

But if i choose, i would start from the scratch, and be back in the 1st squere! Thanks for your suggest

True, but if it's a fresh start, I would have suggested doing it in C# as most of the classes are ready to run on Android and you can port the same program to iOS with minimal changes... which makes it great.

#include<iostream> #include<fstream> #include<string> #include<cmath> #include<cstdio> using namespace std; int main() { ifstream obj("student.csv"); if(!obj.is_open()) std::cout<<"File Open "<<endl; int avg,total,eng,mat,sci; string name; string english; string math; string science; while(obj.good()) { getline(obj,name,','); getline(obj,english,','); getline(obj,math,','); getline(obj,science); eng=stoi(english); mat=stoi(math); sci=stoi(science); total=(eng+mat+sci); avg=total/3; cout<<name<<" Your total Marks are :"<<total<<" Average marks are :"<<avg<<endl; ofstream average; average.open("Final Marksheet.csv"); average<<"Name"<<","<<"English"<<","<<"Mathematics"<<","<<"Science"<<endl; for(int i=0; i<5; i++) { average<<name<<","<<eng<<","<<mat<<","<<sci<<","<<avg<<endl; } } getchar(); return 0; }

Hello there! I have a question regarding using Regular Expressions in C++. So, + in regex means repentance of the preceding character one or more times and [abc] means any of the character inside [] that is any of the char from a, b and c will match. Following from the above two [abc]+ should match any string containing only arbitrary number of a, b and c that is, aabbbbc, acccc, accccbbb, bbc, etc all will match. Also ' . ' is a wildcard character that matches any character and whitespace except newline.Am I right till here? I hope so, if not please correct me. Now to match a string "Hello\n I am a C++ programmer" I wrote the regex [.\n]+ and it did not work. But when I changed it to .+\n.+ to my surprise it worked then. Can anyone tell me what am I doing wrong?

Inside a character class everything except ^, -, ] or \ is always a literal. [.]{3} therefore only matches ...

Thanks Olli. Can you tell me a good resource to learn regex, the source from where I learnt regex did not teach me this.

I would recommend getting to know the rules by Wikipedia (https://en.wikipedia.org/wiki/Regular_expression#Standards)and play with regex on a site like https://regex101.com/ to get good visualization and understanding of how things work. Regex101 provides an explanation for your current expression. Don't know whether this helps you though

Thank you.

Which is the best python book for reading?

#include<iostream> #include<fstream> #include<string> #include<cmath> #include<cstdio> using namespace std; int main() { ifstream obj("student.csv"); if(!obj.is_open()) std::cout<<"File Open "<<endl; int avg,total,eng,mat,sci; string name; string english; string math; string science; while(obj.good()) { getline(obj,name,','); getline(obj,english,','); getline(obj,math,','); getline(obj,science); eng=stoi(english); mat=stoi(math); sci=stoi(science); total=(eng+mat+sci); avg=total/3; cout<<name<<" Your total Marks are :"<<total<<" Average marks are :"<<avg<<endl; ofstream average; average.open("Final Marksheet.csv"); average<<"Name"<<","<<"English"<<","<<"Mathematics"<<","<<"Science"<<endl; for(int i=0; i<5; i++) { average<<name<<","<<eng<<","<<mat<<","<<sci<<","<<avg<<endl; } } getchar(); return 0; }

Which is the best python book for reading?

Hello people! I am learning Exception Handling in C++ using Bjarne Stroustrup's C++ Programming Language. There is one particular line that intrigues me "The author of the Library knows how to detect an exception but not what to do with it. This is left to the user of the Library." And I could not think of a situation where such a thing would happen. I did come up with an example though, suppose I am writing a C++ Library to provide Restful Web API service, now if somehow the connection is lost or API service is temporarily unavailable the program should raise exception because although the author of the Library knows that some exception has occurred, he does not know what to do with it, such as freeing some resource dependent on the API or printing an error message. But I don't know how accurate this example is, I am an undergraduate student and have never written Production Level code in C++ or any other language. I would be glad if someone can give some insight relating to a real world example. Thank you.