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@@ -0,0 +1,188 @@
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+//
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+// NSString+NumberSystem.m
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+// ZZFoundation
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+//
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+// Created by Max on 2021/11/23.
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+//
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+
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+#import "NSString+NumberSystem.h"
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+
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+@implementation NSString (NumberSystem)
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+/**
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+ 十进制转换为二进制
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+
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+ @param decimal 十进制数
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+ @return 二进制数
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+ */
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++ (NSString *)getBinaryByDecimal:(NSInteger)decimal {
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+
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+ NSString *binary = @"";
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+ while (decimal) {
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+
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+ binary = [[NSString stringWithFormat:@"%ld", decimal % 2] stringByAppendingString:binary];
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+ if (decimal / 2 < 1) {
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+
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+ break;
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+ }
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+ decimal = decimal / 2 ;
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+ }
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+ if (binary.length % 4 != 0) {
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+
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+ NSMutableString *mStr = [[NSMutableString alloc]init];;
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+ for (int i = 0; i < 4 - binary.length % 4; i++) {
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+
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+ [mStr appendString:@"0"];
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+ }
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+ binary = [mStr stringByAppendingString:binary];
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+ }
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+ return binary;
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+}
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+
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+/**
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+ 十进制转换十六进制
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+
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+ @param decimal 十进制数
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+ @return 十六进制数
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+ */
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++ (NSString *)getHexByDecimal:(NSInteger)decimal {
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+
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+ NSString *hex =@"";
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+ NSString *letter;
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+ NSInteger number;
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+ for (int i = 0; i<9; i++) {
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+
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+ number = decimal % 16;
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+ decimal = decimal / 16;
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+ switch (number) {
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+
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+ case 10:
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+ letter =@"A"; break;
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+ case 11:
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+ letter =@"B"; break;
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+ case 12:
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+ letter =@"C"; break;
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+ case 13:
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+ letter =@"D"; break;
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+ case 14:
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+ letter =@"E"; break;
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+ case 15:
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+ letter =@"F"; break;
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+ default:
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+ letter = [NSString stringWithFormat:@"%ld", number];
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+ }
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+ hex = [letter stringByAppendingString:hex];
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+ if (decimal == 0) {
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+
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+ break;
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+ }
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+ }
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+ return hex;
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+}
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+
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+/**
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+ 二进制转换成十六进制
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+
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+ @param binary 二进制数
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+ @return 十六进制数
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+ */
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++ (NSString *)getHexByBinary:(NSString *)binary {
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+
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+ NSMutableDictionary *binaryDic = [[NSMutableDictionary alloc] initWithCapacity:16];
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+ [binaryDic setObject:@"0" forKey:@"0000"];
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+ [binaryDic setObject:@"1" forKey:@"0001"];
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+ [binaryDic setObject:@"2" forKey:@"0010"];
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+ [binaryDic setObject:@"3" forKey:@"0011"];
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+ [binaryDic setObject:@"4" forKey:@"0100"];
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+ [binaryDic setObject:@"5" forKey:@"0101"];
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+ [binaryDic setObject:@"6" forKey:@"0110"];
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+ [binaryDic setObject:@"7" forKey:@"0111"];
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+ [binaryDic setObject:@"8" forKey:@"1000"];
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+ [binaryDic setObject:@"9" forKey:@"1001"];
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+ [binaryDic setObject:@"A" forKey:@"1010"];
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+ [binaryDic setObject:@"B" forKey:@"1011"];
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+ [binaryDic setObject:@"C" forKey:@"1100"];
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+ [binaryDic setObject:@"D" forKey:@"1101"];
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+ [binaryDic setObject:@"E" forKey:@"1110"];
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+ [binaryDic setObject:@"F" forKey:@"1111"];
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+
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+ if (binary.length % 4 != 0) {
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+
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+ NSMutableString *mStr = [[NSMutableString alloc]init];;
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+ for (int i = 0; i < 4 - binary.length % 4; i++) {
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+
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+ [mStr appendString:@"0"];
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+ }
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+ binary = [mStr stringByAppendingString:binary];
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+ }
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+ NSString *hex = @"";
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+ for (int i=0; i<binary.length; i+=4) {
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+
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+ NSString *key = [binary substringWithRange:NSMakeRange(i, 4)];
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+ NSString *value = [binaryDic objectForKey:key];
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+ if (value) {
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+
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+ hex = [hex stringByAppendingString:value];
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+ }
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+ }
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+ return hex;
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+}
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+
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+/**
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+ 十六进制转换为二进制
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+
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+ @param hex 十六进制数
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+ @return 二进制数
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+ */
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++ (NSString *)getBinaryByHex:(NSString *)hex {
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+
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+ NSMutableDictionary *hexDic = [[NSMutableDictionary alloc] initWithCapacity:16];
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+ [hexDic setObject:@"0000" forKey:@"0"];
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+ [hexDic setObject:@"0001" forKey:@"1"];
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+ [hexDic setObject:@"0010" forKey:@"2"];
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+ [hexDic setObject:@"0011" forKey:@"3"];
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+ [hexDic setObject:@"0100" forKey:@"4"];
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+ [hexDic setObject:@"0101" forKey:@"5"];
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+ [hexDic setObject:@"0110" forKey:@"6"];
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+ [hexDic setObject:@"0111" forKey:@"7"];
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+ [hexDic setObject:@"1000" forKey:@"8"];
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+ [hexDic setObject:@"1001" forKey:@"9"];
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+ [hexDic setObject:@"1010" forKey:@"A"];
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+ [hexDic setObject:@"1011" forKey:@"B"];
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+ [hexDic setObject:@"1100" forKey:@"C"];
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+ [hexDic setObject:@"1101" forKey:@"D"];
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+ [hexDic setObject:@"1110" forKey:@"E"];
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+ [hexDic setObject:@"1111" forKey:@"F"];
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+
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+ NSString *binary = @"";
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+ for (int i=0; i<[hex length]; i++) {
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+
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+ NSString *key = [hex substringWithRange:NSMakeRange(i, 1)];
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+ NSString *value = [hexDic objectForKey:key.uppercaseString];
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+ if (value) {
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+
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+ binary = [binary stringByAppendingString:value];
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+ }
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+ }
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+ return binary;
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+}
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+
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+/**
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+ 二进制转换为十进制
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+
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+ @param binary 二进制数
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+ @return 十进制数
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+ */
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++ (NSString *)getDecimalByBinary:(NSString *)binary {
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+
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+ NSInteger decimal = 0;
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+ for (int i=0; i<binary.length; i++) {
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+
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+ NSString *number = [binary substringWithRange:NSMakeRange(binary.length - i - 1, 1)];
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+ if ([number isEqualToString:@"1"]) {
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+
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+ decimal += pow(2, i);
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+ }
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+ }
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+ return [NSString stringWithFormat:@"%zd",decimal];
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+}
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+@end
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