Comment lines – VXI VT1422A User Manual

Page 222

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220 Creating and Running Algorithms

Chapter 6

Comment Lines

Probably the most important element of programming is the comment.
In older BASIC interpreters the comment line began with "REM" and
ended at the end-of-line character(s) (probably carriage return then
linefeed). Later BASICs allowed comments to also begin with various
"shorthand" characters such as "!" or "'". In all cases, a comment ended
when the end-of-line is encountered. In 'C' and the Algorithm Language,
comments begin with the two characters "/*" and continue until the two
characters "*/" are encountered. Examples:

/* this line is solely a comment line */
if ( a != b) c = d + 1; /* comment within a code line */
/* This comment is composed of more than one line.

The comment can be any number of lines long and
terminates when the following two characters appear

*/

About the only character combination that is not allowed within a comment
is "*/", since this will terminate the comment.

if(a <= 0) c=abs(a);

if(a != 0)

c = b / a;

if((a != b) && (a != c))
{

a = a * b;
b = b + 1;
c = 0;

}

if((a == 5) || (b == -5))
{

c = abs(c);
c = 2 / c;

}
else
{

c = a * b;

}

IF A<=0 THEN C=ABS(A)

IF A<>0 THEN

C=B/A

END IF

IF A<>B AND A<>C THEN

A=A*B
B=B+1
C=0

END IF

IF A=5 OR B=-5 THEN

C=ABS(C)
C= 2/C

ELSE

C= A*B

END IF

Examples

BASIC Syntax

'C' Syntax

Figure 6-6. Examples of 'C' and BASIC If Statements

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