Is it really necessary to pass all test cases??

Question

there are hundreds of programs which haven't test cased by all samples.... How can I rectify myself?? Is there any way to make my programs work for all test cases???

Answer 1

You will get that through practice. And yes it is necessary to pass all the test cases. For example take the hackerrank website where there are 100's of test cases to pass before you submit your code.
It is also essential when it comes to land your first job in tech giants because for every problem they give you to solve they have test cases to check whether your code runs properly for all test cases.