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Computer File Input Output Difficulty: Medium

How do you check if a file was opened successfully in C?

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How do you establish a connection to an SQLite database using sqlite3? What is the default value of column? The operator > and < are meaningful when used with pointers, if Determine output: class A{ { System.out.print("b1 "); } public A(){ System.out.print("b2 "); } } class B extends A{ static{ System.out.print("r1 "); } public B(){ System.out.print("r2 "); } { System.out.print("r3 "); } static{ System.out.print("r4 "); } } public class Test extends B{ public static void main(String[] args){ System.out.print("pre "); new Test(); System.out.println("post "); } } What is the purpose of the "as" keyword in C#?