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Top Forums Programming strange effect: if ... else in C influence a previous statement Post 302261038 by cdbug on Sunday 23rd of November 2008 03:05:42 AM
Old 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)
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