i want to become a software engineer? now iam studing PUC which programing language suitable for me? Is it C++ program helpfull for me as a basic knowledge

Yes, starting with C++ is good. Also, take a look at Java. Just search "programming for beginners" on youtube and you will be faced with a huge number of videos about the subject.

c++ is a good language to start learning programming but it would be recommended to learn c language as well
once you have a good hold on the both of these you can jump to java and the other advanced languages
These three languages serve as the base for all the programming languages
Best of luck :)