Ⅰ 编写一个加密函数对一个字符串加密，函数原型为：
char*entropy(char*s)
{
if(s==0)
return0;
char*p=(char*)malloc(strlen(s)+1);
memset(p,0,strlen(s)+1);
char*temp=s;
char*temp2=p;
while(*temp!=' ')
{
if(('a'<=*temp&&*temp<'x')||('A'<=*temp&&*temp<'X'))
{
*temp2=*temp+3;
}elseif(('x'<=*temp&&*temp<='z'))
{
*temp2='a'+(*temp-'x');
}elseif(('X'<=*temp&&*temp<='Z'))
{
*temp2='a'+(*temp-'X');
}else
{
*temp2=*temp;
}
temp++;
temp2++;
}
returnp;
}
intmain()
{
printf("pleaseinputastring: ");
chara[100]={' '};
scanf("%s",a);
char*p=entropy(a);
printf("%s ",p);
deletep;
}
Ⅱ 编写一个数据加密函数（用C编写）
这个问题并不难，两个数组很容易实现
main()
{
int i,a[4],b[4];
printf("请输入四个数字： ");
for(i=0;i<4;i++)
scanf("%d",a[i]);
b[0]=（a[3]+6）%8；
b[1]=（a[2]+6）%8；
b[2]=（a[1]+6）%8；
b[3]=（a[0]+6）%8；
printf("原数组是：")
for(i=0;i<4;i++)
printf("%d",a[i])
printf("加密后的数组是：")
for(i=0;i<4;i++)
printf("%d",b[i])
}
Ⅲ 用c语言写一个加密函数。
printf("please enter the user code:")
scanf("%d",&co);
if(co==2)
printf("plese enter the kassword:");
scanf("%d",&passwd);
if(passwd==)
Ⅳ VB中如何编写一个加密程序
编写一个加密软件，要求将源文件按字节逐位倒排序加密法加密。
字节逐位倒排序加密法是以比特为单位的换位加密方法，用vb实现的具体算法是：
(1) 以二进制模式打开源文件；
(2) 从源文件第i位读取一个字节，假设为字母“a”，得到“a”的ascii值为65；
(3) 将65转换成八位二进制串为“01000001”；
(4) 将“01000001”按字节逐位倒排序得另一个八位二进制串“10000010”；
(5) 将“10000010”转换成十进制再写回源文件第i位置，完成一个字节的加密；
(6) 重复(2)、(3)、(4)和(5)，直到所有字节加密结束。
为了使程序模块化，我们用函数过程bytetobin完成将字节型数据转换成二进制串（其实质就是将十进制数转换成八位二进制串）；用函数过程bintobyte将二进制串转换成字节型数据（实质是将八位二进制串转换成十进制数）：用函数过程reverse将八位二进制串逐位倒排序。具体程序如下：
function bytetobin(m as byte) as string ' 将字节型数据转换成八位二进制字符串
dim c$
c$ = ""
do while m <> 0
r = m mod 2
m = m \ 2
c$ = r & c$
loop
c$ = right("00000000" & c$, 8)
bytetobin = c$
end function
function reverse(m as string) as string ' 将八位二进制字符串颠倒顺序
dim i%, x$
x = ""
for i = 1 to 8
x = mid(m, i, 1) & x
next i
reverse = x
end function
function bintobyte(m as string) as byte ' 将八位二进制串转换成十进制
dim x as string * 1, y%, z%
z = 0
for i = 1 to 8
x = mid(m, i, 1)
y = x * 2 ^ (8 - i)
z = z + y
next i
bintobyte = z
end function
private sub command1_click()
dim x as byte, i%, fname$
fname = inputbox("请输入要加密的文件名！注意加上路径名：")
if dir(fname) = "" then
msgbox "文件不存在！"
exit sub
end if
open fname for binary as #1 ' 以二进制访问模式打开待加密文件
for i = 1 to lof(1) ' lof函数是求文件长度的内部函数
get #1, i, x ' 取出第i个字节
x = bintobyte(reverse(bytetobin(x))) ' 这里调用了三个自定义函数
put #1, i, x ' 将加密后的这个字节写回到文件原位置
next i
close
msgbox "任务完成！"
end sub
Ⅳ c语言编写字符串加密函数 不要写得太难啊
#include<stdio.h>
#include<ctype.h>
char*encrypt(char*text){
charc;
char*p=text;
for(;*text;++text){
c=*text;
if(isdigit(c))
*text='0'+'9'-c;
elseif(islower(c)){
c=c+3;
if(c>'z')
c=c-26;
*text=c;
}elseif(isupper(c)){
c=c+3;
if(c>'Z')
c=c-26;
*text=c;
}
}
returnp;
}
intmain(){
chartext[100];
printf("输入明文:");
scanf("%s",text);
printf("密文:%s ",encrypt(text));
getchar();
}
Ⅵ 如何用VBA 编写MD5加密函数
'电子表格中调用方法1如 =MD5(A1,16)
'电子表格中调用方法2如 =MD5(A1,32)
'打开Excel按Alt+F11，然后点插入菜单中的模块，然后把这上面所有代码粘贴到模块1中，保存关闭即可在单元格中调用
'这些是注释，以把以下代码直接复制到使用即可。
Private Const BITS_TO_A_BYTE = 8
Private Const BYTES_TO_A_WORD = 4
Private Const BITS_TO_A_WORD = 32
Private m_lOnBits(30)
Private m_l2Power(30)
Private Function LShift(lValue, iShiftBits)
If iShiftBits = 0 Then
LShift = lValue
Exit Function
ElseIf iShiftBits = 31 Then
If lValue And 1 Then
LShift = &H80000000
Else
LShift = 0
End If
Exit Function
ElseIf iShiftBits < 0 Or iShiftBits > 31 Then
Err.Raise 6
End If
If (lValue And m_l2Power(31 - iShiftBits)) Then
LShift = ((lValue And m_lOnBits(31 - (iShiftBits + 1))) * m_l2Power(iShiftBits)) Or &H80000000
Else
LShift = ((lValue And m_lOnBits(31 - iShiftBits)) * m_l2Power(iShiftBits))
End If
End Function
Private Function RShift(lValue, iShiftBits)
If iShiftBits = 0 Then
RShift = lValue
Exit Function
ElseIf iShiftBits = 31 Then
If lValue And &H80000000 Then
RShift = 1
Else
RShift = 0
End If
Exit Function
ElseIf iShiftBits < 0 Or iShiftBits > 31 Then
Err.Raise 6
End If
RShift = (lValue And &H7FFFFFFE) \ m_l2Power(iShiftBits)
If (lValue And &H80000000) Then
RShift = (RShift Or (&H40000000 \ m_l2Power(iShiftBits - 1)))
End If
End Function
Private Function RotateLeft(lValue, iShiftBits)
RotateLeft = LShift(lValue, iShiftBits) Or RShift(lValue, (32 - iShiftBits))
End Function
Private Function AddUnsigned(lX, lY)
Dim lX4
Dim lY4
Dim lX8
Dim lY8
Dim lResult
lX8 = lX And &H80000000
lY8 = lY And &H80000000
lX4 = lX And &H40000000
lY4 = lY And &H40000000
lResult = (lX And &H3FFFFFFF) + (lY And &H3FFFFFFF)
If lX4 And lY4 Then
lResult = lResult Xor &H80000000 Xor lX8 Xor lY8
ElseIf lX4 Or lY4 Then
If lResult And &H40000000 Then
lResult = lResult Xor &HC0000000 Xor lX8 Xor lY8
Else
lResult = lResult Xor &H40000000 Xor lX8 Xor lY8
End If
Else
lResult = lResult Xor lX8 Xor lY8
End If
AddUnsigned = lResult
End Function
Private Function md5_F(x, y, z)
md5_F = (x And y) Or ((Not x) And z)
End Function
Private Function md5_G(x, y, z)
md5_G = (x And z) Or (y And (Not z))
End Function
Private Function md5_H(x, y, z)
md5_H = (x Xor y Xor z)
End Function
Private Function md5_I(x, y, z)
md5_I = (y Xor (x Or (Not z)))
End Function
Private Sub md5_FF(a, b, c, d, x, s, ac)
a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_F(b, c, d), x), ac))
a = RotateLeft(a, s)
a = AddUnsigned(a, b)
End Sub
Private Sub md5_GG(a, b, c, d, x, s, ac)
a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_G(b, c, d), x), ac))
a = RotateLeft(a, s)
a = AddUnsigned(a, b)
End Sub
Private Sub md5_HH(a, b, c, d, x, s, ac)
a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_H(b, c, d), x), ac))
a = RotateLeft(a, s)
a = AddUnsigned(a, b)
End Sub
Private Sub md5_II(a, b, c, d, x, s, ac)
a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_I(b, c, d), x), ac))
a = RotateLeft(a, s)
a = AddUnsigned(a, b)
End Sub
Private Function ConvertToWordArray(sMessage)
Dim lMessageLength
Dim lNumberOfWords
Dim lWordArray()
Dim lBytePosition
Dim lByteCount
Dim lWordCount
Const MODULUS_BITS = 512
Const CONGRUENT_BITS = 448
lMessageLength = Len(sMessage)
lNumberOfWords = (((lMessageLength + ((MODULUS_BITS - CONGRUENT_BITS) \ BITS_TO_A_BYTE)) \ (MODULUS_BITS \ BITS_TO_A_BYTE)) + 1) * (MODULUS_BITS \ BITS_TO_A_WORD)
ReDim lWordArray(lNumberOfWords - 1)
lBytePosition = 0
lByteCount = 0
Do Until lByteCount >= lMessageLength
lWordCount = lByteCount \ BYTES_TO_A_WORD
lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE
lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(Asc(Mid(sMessage, lByteCount + 1, 1)), lBytePosition)
lByteCount = lByteCount + 1
Loop
lWordCount = lByteCount \ BYTES_TO_A_WORD
lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE
lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(&H80, lBytePosition)
lWordArray(lNumberOfWords - 2) = LShift(lMessageLength, 3)
lWordArray(lNumberOfWords - 1) = RShift(lMessageLength, 29)
ConvertToWordArray = lWordArray
End Function
Private Function WordToHex(lValue)
Dim lByte
Dim lCount
For lCount = 0 To 3
lByte = RShift(lValue, lCount * BITS_TO_A_BYTE) And m_lOnBits(BITS_TO_A_BYTE - 1)
WordToHex = WordToHex & Right("0" & Hex(lByte), 2)
Next
End Function
Public Function MD5(sMessage, stype)
m_lOnBits(0) = CLng(1)
m_lOnBits(1) = CLng(3)
m_lOnBits(2) = CLng(7)
m_lOnBits(3) = CLng(15)
m_lOnBits(4) = CLng(31)
m_lOnBits(5) = CLng(63)
m_lOnBits(6) = CLng(127)
m_lOnBits(7) = CLng(255)
m_lOnBits(8) = CLng(511)
m_lOnBits(9) = CLng(1023)
m_lOnBits(10) = CLng(2047)
m_lOnBits(11) = CLng(4095)
m_lOnBits(12) = CLng(8191)
m_lOnBits(13) = CLng(16383)
m_lOnBits(14) = CLng(32767)
m_lOnBits(15) = CLng(65535)
m_lOnBits(16) = CLng(131071)
m_lOnBits(17) = CLng(262143)
m_lOnBits(18) = CLng(524287)
m_lOnBits(19) = CLng(1048575)
m_lOnBits(20) = CLng(2097151)
m_lOnBits(21) = CLng(4194303)
m_lOnBits(22) = CLng(8388607)
m_lOnBits(23) = CLng(16777215)
m_lOnBits(24) = CLng(33554431)
m_lOnBits(25) = CLng(67108863)
m_lOnBits(26) = CLng(134217727)
m_lOnBits(27) = CLng(268435455)
m_lOnBits(28) = CLng(536870911)
m_lOnBits(29) = CLng(1073741823)
m_lOnBits(30) = CLng(2147483647)
m_l2Power(0) = CLng(1)
m_l2Power(1) = CLng(2)
m_l2Power(2) = CLng(4)
m_l2Power(3) = CLng(8)
m_l2Power(4) = CLng(16)
m_l2Power(5) = CLng(32)
m_l2Power(6) = CLng(64)
m_l2Power(7) = CLng(128)
m_l2Power(8) = CLng(256)
m_l2Power(9) = CLng(512)
m_l2Power(10) = CLng(1024)
m_l2Power(11) = CLng(2048)
m_l2Power(12) = CLng(4096)
m_l2Power(13) = CLng(8192)
m_l2Power(14) = CLng(16384)
m_l2Power(15) = CLng(32768)
m_l2Power(16) = CLng(65536)
m_l2Power(17) = CLng(131072)
m_l2Power(18) = CLng(262144)
m_l2Power(19) = CLng(524288)
m_l2Power(20) = CLng(1048576)
m_l2Power(21) = CLng(2097152)
m_l2Power(22) = CLng(4194304)
m_l2Power(23) = CLng(8388608)
m_l2Power(24) = CLng(16777216)
m_l2Power(25) = CLng(33554432)
m_l2Power(26) = CLng(67108864)
m_l2Power(27) = CLng(134217728)
m_l2Power(28) = CLng(268435456)
m_l2Power(29) = CLng(536870912)
m_l2Power(30) = CLng(1073741824)
Dim x
Dim k
Dim AA
Dim BB
Dim CC
Dim DD
Dim a
Dim b
Dim c
Dim d
Const S11 = 7
Const S12 = 12
Const S13 = 17
Const S14 = 22
Const S21 = 5
Const S22 = 9
Const S23 = 14
Const S24 = 20
Const S31 = 4
Const S32 = 11
Const S33 = 16
Const S34 = 23
Const S41 = 6
Const S42 = 10
Const S43 = 15
Const S44 = 21
x = ConvertToWordArray(sMessage)
a = &H67452301
b = &HEFCDAB89
c = &H98BADCFE
d = &H10325476
For k = 0 To UBound(x) Step 16
AA = a
BB = b
CC = c
DD = d
md5_FF a, b, c, d, x(k + 0), S11, &HD76AA478
md5_FF d, a, b, c, x(k + 1), S12, &HE8C7B756
md5_FF c, d, a, b, x(k + 2), S13, &H242070DB
md5_FF b, c, d, a, x(k + 3), S14, &HC1BDCEEE
md5_FF a, b, c, d, x(k + 4), S11, &HF57C0FAF
md5_FF d, a, b, c, x(k + 5), S12, &H4787C62A
md5_FF c, d, a, b, x(k + 6), S13, &HA8304613
md5_FF b, c, d, a, x(k + 7), S14, &HFD469501
md5_FF a, b, c, d, x(k + 8), S11, &H698098D8
md5_FF d, a, b, c, x(k + 9), S12, &H8B44F7AF
md5_FF c, d, a, b, x(k + 10), S13, &HFFFF5BB1
md5_FF b, c, d, a, x(k + 11), S14, &H895CD7BE
md5_FF a, b, c, d, x(k + 12), S11, &H6B901122
md5_FF d, a, b, c, x(k + 13), S12, &HFD987193
md5_FF c, d, a, b, x(k + 14), S13, &HA679438E
md5_FF b, c, d, a, x(k + 15), S14, &H49B40821
md5_GG a, b, c, d, x(k + 1), S21, &HF61E2562
md5_GG d, a, b, c, x(k + 6), S22, &HC040B340
md5_GG c, d, a, b, x(k + 11), S23, &H265E5A51
md5_GG b, c, d, a, x(k + 0), S24, &HE9B6C7AA
md5_GG a, b, c, d, x(k + 5), S21, &HD62F105D
md5_GG d, a, b, c, x(k + 10), S22, &H2441453
md5_GG c, d, a, b, x(k + 15), S23, &HD8A1E681
md5_GG b, c, d, a, x(k + 4), S24, &HE7D3FBC8
md5_GG a, b, c, d, x(k + 9), S21, &H21E1CDE6
md5_GG d, a, b, c, x(k + 14), S22, &HC33707D6
md5_GG c, d, a, b, x(k + 3), S23, &HF4D50D87
md5_GG b, c, d, a, x(k + 8), S24, &H455A14ED
md5_GG a, b, c, d, x(k + 13), S21, &HA9E3E905
md5_GG d, a, b, c, x(k + 2), S22, &HFCEFA3F8
md5_GG c, d, a, b, x(k + 7), S23, &H676F02D9
md5_GG b, c, d, a, x(k + 12), S24, &H8D2A4C8A
md5_HH a, b, c, d, x(k + 5), S31, &HFFFA3942
md5_HH d, a, b, c, x(k + 8), S32, &H8771F681
md5_HH c, d, a, b, x(k + 11), S33, &H6D9D6122
md5_HH b, c, d, a, x(k + 14), S34, &HFDE5380C
md5_HH a, b, c, d, x(k + 1), S31, &HA4BEEA44
md5_HH d, a, b, c, x(k + 4), S32, &H4BDECFA9
md5_HH c, d, a, b, x(k + 7), S33, &HF6BB4B60
md5_HH b, c, d, a, x(k + 10), S34, &HBEBFBC70
md5_HH a, b, c, d, x(k + 13), S31, &H289B7EC6
md5_HH d, a, b, c, x(k + 0), S32, &HEAA127FA
md5_HH c, d, a, b, x(k + 3), S33, &HD4EF3085
md5_HH b, c, d, a, x(k + 6), S34, &H4881D05
md5_HH a, b, c, d, x(k + 9), S31, &HD9D4D039
md5_HH d, a, b, c, x(k + 12), S32, &HE6DB99E5
md5_HH c, d, a, b, x(k + 15), S33, &H1FA27CF8
md5_HH b, c, d, a, x(k + 2), S34, &HC4AC5665
md5_II a, b, c, d, x(k + 0), S41, &HF4292244
md5_II d, a, b, c, x(k + 7), S42, &H432AFF97
md5_II c, d, a, b, x(k + 14), S43, &HAB9423A7
md5_II b, c, d, a, x(k + 5), S44, &HFC93A039
md5_II a, b, c, d, x(k + 12), S41, &H655B59C3
md5_II d, a, b, c, x(k + 3), S42, &H8F0CCC92
md5_II c, d, a, b, x(k + 10), S43, &HFFEFF47D
md5_II b, c, d, a, x(k + 1), S44, &H85845DD1
md5_II a, b, c, d, x(k + 8), S41, &H6FA87E4F
md5_II d, a, b, c, x(k + 15), S42, &HFE2CE6E0
md5_II c, d, a, b, x(k + 6), S43, &HA3014314
md5_II b, c, d, a, x(k + 13), S44, &H4E0811A1
md5_II a, b, c, d, x(k + 4), S41, &HF7537E82
md5_II d, a, b, c, x(k + 11), S42, &HBD3AF235
md5_II c, d, a, b, x(k + 2), S43, &H2AD7D2BB
md5_II b, c, d, a, x(k + 9), S44, &HEB86D391
a = AddUnsigned(a, AA)
b = AddUnsigned(b, BB)
c = AddUnsigned(c, CC)
d = AddUnsigned(d, DD)
Next
If stype = 32 Then
MD5 = LCase(WordToHex(a) & WordToHex(b) & WordToHex(c) & WordToHex(d))
Else
MD5 = LCase(WordToHex(b) & WordToHex(c))
End If
End Function
'以下为测试用，可以不要
Sub test()
Dim i As String
i = InputBox("Please input a password:")
If MD5(i, 32) = MD5("abc", 32) Or MD5(i, 16) = MD5("abc", 16) Then: MsgBox "Ok": Else: MsgBox "failed": End
'MsgBox MD5("abc", 16) '返回16位小写
'MsgBox MD5("abc", 32) '返回32位小写
End Sub
'电子表格中调用方法1如 =MD5(A1,16)
'电子表格中调用方法2如 =MD5(A1,32)
'打开Excel按Alt+F11，然后点插入菜单中的模块，然后把这上面所有代码粘贴到模块1中，保存关闭即可在单元格中调用
Ⅶ 怎样用VB编写一个文件加密程序
字节逐位倒排序加密法是以比特为单位的换位加密方法，用VB实现的具体算法是：
(1) 以二进制模式打开源文件；
(2) 从源文件第I位读取一个字节，假设为字母“A”，得到“A”的ASCII值为65；
(3) 将65转换成八位二进制串为“01000001”；
(4) 将“01000001”按字节逐位倒排序得另一个八位二进制串“10000010”；
(5) 将“10000010”转换成十进制再写回源文件第I位置，完成一个字节的加密；
(6) 重复(2)、(3)、(4)和(5)，直到所有字节加密结束。
为了使程序模块化，我们用函数过程ByteToBin完成将字节型数据转换成二进制串（其实质就是将十进制数转换成八位二进制串）；用函数过程BinToByte将二进制串转换成字节型数据（实质是将八位二进制串转换成十进制数）：用函数过程Reverse将八位二进制串逐位倒排序。具体程序如下：
Function ByteToBin(m As Byte) As String ' 将字节型数据转换成八位二进制字符串
Dim c$
c$ = ""
Do While m <> 0
r = m Mod 2
m = m \ 2
c$ = r & c$
Loop
c$ = Right("00000000" & c$, 8)
ByteToBin = c$
End Function
Function Reverse(m As String) As String ' 将八位二进制字符串颠倒顺序
Dim i%, x$
x = ""
For i = 1 To 8
x = Mid(m, i, 1) & x
Next i
Reverse = x
End Function
Function BinToByte(m As String) As Byte ' 将八位二进制串转换成十进制
Dim x As String * 1, y%, z%
z = 0
For i = 1 To 8
x = Mid(m, i, 1)
y = x * 2 ^ (8 - i)
z = z + y
Next i
BinToByte = z
End Function
Private Sub Command1_Click()
Dim x As Byte, i%, fname$
fname = InputBox("请输入要加密的文件名！注意加上路径名：")
If Dir(fname) = "" Then
MsgBox "文件不存在！"
Exit Sub
End If
Open fname For Binary As #1 ' 以二进制访问模式打开待加密文件
For i = 1 To LOF(1) ' LOF函数是求文件长度的内部函数
Get #1, i, x ' 取出第i个字节
x = BinToByte(Reverse(ByteToBin(x))) ' 这里调用了三个自定义函数
Put #1, i, x ' 将加密后的这个字节写回到文件原位置
Next i
Close
MsgBox "任务完成！"
End Sub
本例可以完成对任意文件的加密与解密，对同一文件作第一次处理为加密，第二次处理为解密。要调试本程序，可用记事本在C盘根目录下任意建立一个文本文件（假设为文件名为aaa.txt），其中的内容任意（可以包括字母、汉字、数字、回车符、换行符等）。运行本程序后，在输入文件名的对话框中输入文件名（如：“C:\aaa.txt”）后回车，即可完成对文件的加密。文件加密后，可以在记事本中打开该文件查看加密效果。如果想解密，可再次运行该程序并输入相同文件名。
Ⅷ 如何写PHP加密算法
第一步.变量名称混淆[可选]
第二步.将所有代码用16进制字符或八进制字符表示组成字符串，如\x78,\187
第三步.将组合成的字符串先base64编码在base64解码,如base64_decode(base64_encode(str));
第四步.将组合成的字符串放入到eval()函数中执行
第五步 伪装整个页面
ok完成
当然也可以自己写个加密解密函数，加入到文件里面。
Ⅸ c++编写密码加密和解密函数
void encode(char * buff)
{
char *p=buff;
while(*p)
{
*p=255-*p;
p++;
}
}
Ⅹ C语言设计一个简单的加密解密程序
C语言设计一个简单的加密解密程序如下：
加密程序代码：
#include<stdio.h>
main()
{
char
c,filename[20];
FILE
*fp1,*fp2;
printf("请输入待加密的文件名:\n");
scanf("%s",filename);
fp1=fopen(filename,"r");
fp2=fopen("miwen.txt","w");
do
{
c=fgetc(fp1);
if(c>=32&&c<=126)
{
c=c-32;
c=126-c;
}
if(c!=-1)
fprintf(fp2,"%c",c);
}
while(c!=-1);
}
解密程序代码：
#include<stdio.h>
#include<string.h>
main()
{
char
c,filename[20];
char
yanzhengma[20];
FILE
*fp1,*fp2;
printf("请输入待解密文件名:\n");
scanf("%s",filename);
printf("请输入验证码:\n");
scanf("%s",yanzhengma);
if(strcmp(yanzhengma,"shan")==0)
{
fp1=fopen(filename,"r");
fp2=fopen("yuanwen.txt","w");
do
{
c=fgetc(fp1);
if(c>=32&&c<=126)
{
c=126-c;
c=32+c;
}
if(c!=-1)
fprintf(fp2,"%c",c);
}
while(c!=-1);
}
else
{
printf("验证码错误！请重新输入:\n");
scanf("%s",filename);
}
}