Rockwell-automation 2098-IPD-xxx Ultra5000 C Programming using the Mot Instrukcja Użytkownika Pobierz pdf (Strona 37)

Publication 2098-PM001E-EN-P — July 2002

Programming Motion Control in C 1-25

The last statement (else) performs the default or “none of the above”

case, and may be omitted in obvious situations. The structure is

shown below.

if (expression1) /* If expression1 is 1,

perform statement1 */

statement1;

else if (expression2) /* If expression2 is 1,

perform statement2 */

statement2;

else if (expression3) /* If expression3 is 1,

perform block3-4 */

{

statement3;

statement4;

}

else /* default to statement5

*/

statement5;

Else-if is what is known as a nested statement. A non-typical indented

alternative for writing the statement shows the functionality of the

statement nesting.

if (expression1) /* initial if-else

statement */

statement1;

else

if (expression2) /* nested if-else

statement */

statement2;

else

if (expression3) /* another nested if-else

statement */

{

statement3;

statement4;

}

else

statement 5;

The nested else-if program consists of a series of if-else statements for

which the statement part of the else is another if-else statement. The

rule to remember is that the else goes with the preceding if, unless

braces indicate otherwise.

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