0) classify = "positive"; else classify = "negative"; //?: conditional operator. classify = (input > 0)? "positive": "negative";. The conditional operator is right-associative. The expression a? b: c? d: e is evaluated as.">
1 Faekus

Vb Net Conditional Assignment In C

If Operator (Visual Basic)

Uses short-circuit evaluation to conditionally return one of two values. The operator can be called with three arguments or with two arguments.

Syntax

If Operator Called with Three Arguments

When is called by using three arguments, the first argument must evaluate to a value that can be cast as a . That value will determine which of the other two arguments is evaluated and returned. The following list applies only when the operator is called by using three arguments.

Parts

TermDefinition
Required. . Determines which of the other arguments to evaluate and return.
Required. . Evaluated and returned if evaluates to .
Required. . Evaluated and returned if evaluates to or if is a Nullable variable that evaluates to Nothing.

An operator that is called with three arguments works like an function except that it uses short-circuit evaluation. An function always evaluates all three of its arguments, whereas an operator that has three arguments evaluates only two of them. The first argument is evaluated and the result is cast as a value, or . If the value is , is evaluated and its value is returned, but is not evaluated. If the value of the expression is , is evaluated and its value is returned, but is not evaluated. The following examples illustrate the use of when three arguments are used:

The following example illustrates the value of short-circuit evaluation. The example shows two attempts to divide variable by variable except when is zero. In that case, a 0 should be returned, and no attempt should be made to perform the division because a run-time error would result. Because the expression uses short-circuit evaluation, it evaluates either the second or the third argument, depending on the value of the first argument. If the first argument is true, the divisor is not zero and it is safe to evaluate the second argument and perform the division. If the first argument is false, only the third argument is evaluated and a 0 is returned. Therefore, when the divisor is 0, no attempt is made to perform the division and no error results. However, because does not use short-circuit evaluation, the second argument is evaluated even when the first argument is false. This causes a run-time divide-by-zero error.

If Operator Called with Two Arguments

The first argument to can be omitted. This enables the operator to be called by using only two arguments. The following list applies only when the operator is called with two arguments.

Parts

TermDefinition
Required. . Must be a reference or nullable type. Evaluated and returned when it evaluates to anything other than .
Required. . Evaluated and returned if evaluates to .

When the argument is omitted, the first argument must be a reference or nullable type. If the first argument evaluates to , the value of the second argument is returned. In all other cases, the value of the first argument is returned. The following example illustrates how this evaluation works.

See Also

IIf
Nullable Value Types
Nothing

Douglas MacArthur's escape from the Philippines during World War II began on 11 March 1942, after U.S. President Franklin D. Roosevelt ordered him to withdraw. MacArthur left Corregidor Island and traveled in PT boats with his forces through stormy seas patrolled by Japanese warships, reaching Mindanao two days later. Arriving in Australia, he declared, "I came through and I shall return". MacArthur, a well-known general who had a distinguished record in World War I, had retired from the army in 1937 to become a defense advisor to the Philippine government. He was recalled to active duty in July 1941, a few months before the outbreak of the Pacific War with the Empire of Japan, to become commander of the U.S. Army Forces in the Far East, which included Philippine forces. By March 1942, the Japanese invasion of the Philippines had compelled him to withdraw his forces on Luzon to Bataan. The doomed defense of Bataan captured the imagination of the American public, and MacArthur became a living symbol of Allied resistance to the Japanese, at a time when the news from all fronts was uniformly bad. (Full article...)

Did you know...

  • ... that at the inquest into the death of Catherine Lynch(pictured), the presiding coroner described her as "one of a class who were a nuisance to themselves, their husbands and everybody else"?
  • ... that the appearance of Ash Lynx, the main character in the manga Banana Fish, is based on tennis player Stefan Edberg and actor River Phoenix?
  • ... that laughter, a signal of amusement, helps us cope with stress?
  • ... that the Diet of Transylvania elected Sigismund Rákóczi prince in 1607, although he had proposed his former son-in-law to the delegates?
  • ... that the landmarked 19th-century Robert and Anne Dickey House, which formerly housed the French consulate in New York City, is being incorporated into a new school building?
  • ... that the Dhammakaya Movement teaches that Nirvana exists as a literal reality within each individual?
  • ... that Rie Takahashi decided to pursue a voice acting career after noticing that many male characters were voiced by females?
  • ... that the American Bank Note Company Printing Plant included an office for a counterfeiter?

Catherine Lynch

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