十进制和36进制之间的转换

/**

*十进制长整型变量转换36进制字符串

*

*@paramdecimal 10进制长整型

*

*@return36进制字符串

*/

+ (NSString*)decimal2ThirtySix:(unsignedlonglong)decimal

{

NSMutableString* dd = [NSMutableStringstring];

NSString* parma =@"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";

unsignedlonglongi = decimal;

while(i>0){

intc = i%36;

i = i/36;

charcc = [parmacharacterAtIndex:c];

[ddinsertString:[NSStringstringWithFormat:@"%c",cc]atIndex:0];

}

returndd;

}

/**

*  36进制字符串转换10进制长整型变量

*

*@paramthirtySixStr 36进制字符串

*

*@return10进制长整型变量

*/

+ (unsignedlonglong)thirtySix2Decimal:(NSString*)thirtySixStr{

NSString*str36 = [thirtySixStrcopy];

unsignedlonglongcou=0;

unsignedlonglength = [str36length];

for(unsignedlongj = length ; j>0;j--) {

charc = [str36characterAtIndex:j-1];

if(c>='0'&&c<='9'){

cou = cou+(c-'0')*pow(36,(length-j));

}elseif(c>='a'&&c<='z'){

cou = cou+(c-'a'+10)*pow(36,(length-j));

}

}

returncou;

}