11-23-2008
The mistaken value is assigned to y when execute 'y = expression;'
in gdb, 'p y' will give the mistaken value after runing the above statement.
but ' p expression' gives the right value.
block2 and block3 are like this:
if(a->is_root) c = m2 - y2;
else f = m2 - y2;
As said before:
only one statement: if(a->is_root) c = m2 - y2; // y2 normal
only one statement: if(!a->is_root) f = m2 - y2; // y2 normal
but:
if(a->is_root) c = m2 - y2;
else f = m2 - y2;
or
if(a->is_root) c = m2 - y2;
if(!a->is_root) f = m2 - y2;
both make y2 abnormal. 'y2 = expression' is far away from if__ else __ structure
Thanks for your teaching
Last edited by cdbug; 11-23-2008 at 04:28 AM..
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RATFOR(1) General Commands Manual RATFOR(1)
NAME
ratfor - rational Fortran dialect
SYNOPSIS
ratfor [ option ... ] [ filename ... ]
DESCRIPTION
Ratfor converts a rational dialect of Fortran into ordinary irrational Fortran. Ratfor provides control flow constructs essentially iden-
tical to those in C:
statement grouping:
{ statement; statement; statement }
decision-making:
if (condition) statement [ else statement ]
switch (integer value) {
case integer: statement
...
[ default: ] statement
}
loops: while (condition) statement
for (expression; condition; expression) statement
do limits statement
repeat statement [ until (condition) ]
break
next
and some syntactic sugar to make programs easier to read and write:
free form input:
multiple statements/line; automatic continuation
comments:
# this is a comment
translation of relationals:
>, >=, etc., become .GT., .GE., etc.
return (expression)
returns expression to caller from function
define:
define name replacement
include:
include filename
Ratfor is best used with f77(1).
SEE ALSO
f77(1)
B. W. Kernighan and P. J. Plauger, Software Tools, Addison-Wesley, 1976.
7th Edition April 29, 1985 RATFOR(1)