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What are typical uses of null statement
; in C ?
I know that it is basically used to skip expression where it is expected by the compiler, but here I'm interested only in real-world examples of such use cases.
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for ( i = 0; i < 10; line[i++] = 0 ) ; In this example, the loop expression of the for statement line[i++] = 0 initializes the first 10 elements of line to 0. The statement body is a null statement, since no further statements are necessary.
The NULL statement is an executable statement that does nothing. The NULL statement can act as a placeholder whenever an executable statement is required, but no SQL operation is wanted; for example, within a branch of the IF-THEN-ELSE statement.
To write a null hypothesis, first start by asking a question. Rephrase that question in a form that assumes no relationship between the variables. In other words, assume a treatment has no effect. Write your hypothesis in a way that reflects this.
An empty statement is used when you no need to perform an operation where a statement is required. It simply transfers control to the end point of the statement. It is also very useful with a while loop with the blank body and label statements.
It's typically the side-effect of a code block that was stripped by the preprocessor, like
#if DEBUG #define ASSERT(_x) Assert(_x) #else #define ASSERT(_x) #endif ASSERT(test); // Results in null statement in non-debug builds That, or in loops where your condition already contains whatever needs to be done in each iteration.
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