iOS development-in-process conversion

1, decimal conversion to Binary

/**十进制转换为二进制@param decimal 十进制数@return 二进制数*/+ (NSString *)getBinaryByDecimal:(NSInteger)decimal {　　NSString *binary = @"";　　while (decimal) {　　　　binary = [[NSString stringWithFormat:@"%ld", decimal % 2] stringByAppendingString:binary];　　　　if (decimal / 2 < 1) {　　　　　　break;　　　　}　　　　decimal = decimal / 2 ;　　　　}　　if (binary.length % 4 != 0) {　　　　NSMutableString *mStr = [[NSMutableString alloc]init];　　　　for (int i = 0; i < 4 - binary.length % 4; i++) {　　　　　　[mStr appendString:@"0"];　　　　}　　　　binary = [mStr stringByAppendingString:binary];　　}　　return binary;}

2. Decimal conversion to hexadecimal

/**将十进制转化为十六进制@param decimal 10进制 int类型@return 16进制*/+ (NSString*)changDecimalToHex:(NSInteger)decimal {　　NSString* intDecimalStr = [[NSString alloc] initWithFormat:@"%1lx", (long)decimal];　　NSString* hexString = [NSString stringWithFormat:@"%@", intDecimalStr];　　if (hexString.length == 5) {　　　　return [[NSString stringWithFormat:@"0%@", hexString] uppercaseString];　　} else {　　　　return [hexString uppercaseString];　　}}

3. binary conversion to hexadecimal

/** binary converted to hexadecimal @param binary binary @return hexadecimal number */+ (NSString *) Gethexbybinary: (NSString *) binary {nsmutabledic    Tionary *binarydic = [[Nsmutabledictionary alloc] initwithcapacity:16];    [Binarydic setobject:@ "0" forkey:@ "0000"];    [Binarydic setobject:@ "1" forkey:@ "0001"];    [Binarydic setobject:@ "2" forkey:@ "0010"];    [Binarydic setobject:@ "3" forkey:@ "0011"];    [Binarydic setobject:@ "4" forkey:@ "0100"];    [Binarydic setobject:@ "5" forkey:@ "0101"];    [Binarydic setobject:@ "6" forkey:@ "0110"];    [Binarydic setobject:@ "7" forkey:@ "0111"];    [Binarydic setobject:@ "8" forkey:@ "1000"];    [Binarydic setobject:@ "9" forkey:@ "1001"];    [Binarydic setobject:@ "A" forkey:@ "1010"];    [Binarydic setobject:@ "B" forkey:@ "1011"];    [Binarydic setobject:@ "C" forkey:@ "1100"];    [Binarydic setobject:@ "D" forkey:@ "1101"];    [Binarydic setobject:@ "E" forkey:@ "1110"];        [Binarydic setobject:@ "F" forkey:@ "1111"]; if (binary.length% 4 = 0) {nsmutablestring *mSTR = [[nsmutablestring alloc]init];;        for (int i = 0; i < 4-binary.length% 4; i++) {[Mstr appendstring:@ "0"];    } binary = [Mstr stringbyappendingstring:binary];    } nsstring *hex = @ "";        for (int i=0; i<binary.length; i+=4) {nsstring *key = [Binary Substringwithrange:nsmakerange (I, 4)];        NSString *value = [Binarydic Objectforkey:key];        if (value) {hex = [hex Stringbyappendingstring:value]; }} return hex;}

4, hexadecimal to binary

/** 16 binary to binary @param hexstring hexadecimal number @return binary number */+ (NSString *) getbinarybyhexstring: (NSString *) hexstring {Nsmuta    Bledictionary *hexdic = [[Nsmutabledictionary alloc] initwithcapacity:16];    [Hexdic setobject:@ "0000" forkey:@ "0"];    [Hexdic setobject:@ "0001" forkey:@ "1"];    [Hexdic setobject:@ "0010" forkey:@ "2"];    [Hexdic setobject:@ "0011" forkey:@ "3"];    [Hexdic setobject:@ "0100" forkey:@ "4"];    [Hexdic setobject:@ "0101" forkey:@ "5"];    [Hexdic setobject:@ "0110" forkey:@ "6"];    [Hexdic setobject:@ "0111" forkey:@ "7"];    [Hexdic setobject:@ "forkey:@" 8 "];    [Hexdic setobject:@ "1001" forkey:@ "9"];    [Hexdic setobject:@ "1010" forkey:@ "A"];    [Hexdic setobject:@ "1011" forkey:@ "B"];    [Hexdic setobject:@ "1100" forkey:@ "C"];    [Hexdic setobject:@ "1101" forkey:@ "D"];    [Hexdic setobject:@ "1110" forkey:@ "E"];        [Hexdic setobject:@ "1111" forkey:@ "F"];    NSString *binary = @ ""; for (int i = 0; i < [hexstring length]; i++) {NSString *key =[HexString Substringwithrange:nsmakerange (I, 1)];        NSString *value = [Hexdic objectForKey:key.uppercaseString];        if (value) {binary = [binary stringbyappendingstring:value]; }} return binary;}

5, hexadecimal to decimal

/** 将十六进制转化为十进制  @param hexString 16进制 nsstring类型 @return 10进制 */+ (NSInteger)changHexToDecimal:(NSString*)hexString {    NSString* temp10 = [NSString stringWithFormat:@"%lu", strtoul([hexString UTF8String], 0, 16)];    int cycleNumber = [temp10 intValue];    return cycleNumber;}

iOS development-in-process conversion