??? 中綴表達式轉后綴表達式……
/**/
/*
test?case:
2*(3+4)-8/2
(2*3+(2+5*2-10))/(8/2)
15+10*(50*2-5)/2
15+10*(50*2-5)/3
1.5*2.3*(3.7-2.13*3.2)-8.0
*/
#include?
<
?stdio.h?
>
#include?
<
?
string
.h?
>
#define
?N?1000
char
?b[N],c,stack[
100
];
int
?bn,sn,isnum,endflag
=
0
;
void
?midtoback()
{
????bn
=
0
;
????sn
=-
1
;
????isnum
=
0
;
????
while
((c
=
getchar())
!=
EOF
&&
c
!=
'
\n
'
)
????
{
????????
switch
(c)
????????
{
????????
case
?
'
(
'
:
????????????
if
(isnum
==
1
)?b[bn
++
]
=
'
,
'
;
????????????isnum
=
2
;
????????????stack[
++
sn]
=
'
(
'
;
????????????
break
;
????????
case
?
'
)
'
:
????????????
if
(isnum
==
1
)?b[bn
++
]
=
'
,
'
;
????????????isnum
=
2
;
????????????
while
(sn
>=
0
&&
stack[sn]
!=
'
(
'
)
????????????
{
????????????????b[bn
++
]
=
stack[sn
--
];
????????????????stack[sn
+
1
]
=
0
;
????????????}
????????????stack[sn
--
]
=
0
;
????????????
break
;
????????
case
?
'
+
'
:
????????????
if
(isnum
==
1
)?b[bn
++
]
=
'
,
'
;
????????????isnum
=
2
;
????????????
while
(sn
>=
0
&&
stack[sn]
!=
'
(
'
)
????????????
{
????????????????b[bn
++
]
=
stack[sn
--
];
????????????????stack[sn
+
1
]
=
0
;
????????????}
????????????stack[
++
sn]
=
'
+
'
;
????????????
break
;
????????
case
?
'
-
'
:
????????????
if
(isnum
==
1
)?b[bn
++
]
=
'
,
'
;
????????????isnum
=
2
;
????????????
while
(sn
>=
0
&&
stack[sn]
!=
'
(
'
)
????????????
{
????????????????b[bn
++
]
=
stack[sn
--
];
????????????????stack[sn
+
1
]
=
0
;
????????????}
????????????stack[
++
sn]
=
'
-
'
;
????????????
break
;
????????
case
?
'
*
'
:
????????????
if
(isnum
==
1
)?b[bn
++
]
=
'
,
'
;
????????????isnum
=
2
;
????????????
while
(sn
>=
0
&&
stack[sn]
!=
'
(
'
&&
stack[sn]
!=
'
+
'
&&
stack[sn]
!=
'
-
'
)
????????????
{
????????????????b[bn
++
]
=
stack[sn
--
];
????????????????stack[sn
+
1
]
=
0
;
????????????}
????????????stack[
++
sn]
=
'
*
'
;
????????????
break
;
????????
case
?
'
/
'
:
????????????
if
(isnum
==
1
)?b[bn
++
]
=
'
,
'
;
????????????isnum
=
2
;
????????????
while
(sn
>=
0
&&
stack[sn]
!=
'
(
'
&&
stack[sn]
!=
'
+
'
&&
stack[sn]
!=
'
-
'
)
????????????
{
????????????????b[bn
++
]
=
stack[sn
--
];
????????????????stack[sn
+
1
]
=
0
;
????????????}
????????????stack[
++
sn]
=
'
/
'
;
????????????
break
;
????????
default
:
????????????isnum
=
1
;
????????????b[bn
++
]
=
c;
????????????
break
;
????????}
????}
????
while
(sn
>=
0
)
????????b[bn
++
]
=
stack[sn
--
];
????
if
(c
!=
'
\n
'
)?endflag
=
1
;
}
int
?main()
{
????
while
(endflag
==
0
)
????
{
????????memset(stack,
0
,
sizeof
(stack));
????????memset(b,
0
,
sizeof
(b));
????????midtoback();
????????printf(
"
%s\n
"
,b);
????}
????
return
?
0
;
}
????????
posted on 2006-10-27 00:05
Asp 閱讀(2553)
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Ar!thmEt!c.Self