十进制转二进制
/**
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:@"%d", decimal % 2] stringByAppendingString:binary];
if (decimal / 2 < 1) {
break;
}
decimal = decimal / 2 ;
}
if (binary.length != 7) {
NSMutableString *mStr = [[NSMutableString alloc]init];;
for (int i = 0; i < 7 - binary.length; i++) {
[mStr appendString:@"0"];
}
binary = [mStr stringByAppendingString:binary];
}
DLog(@"bin---%@",binary);
return binary;
}
二进制转十进制
/**
二进制转十进制
@param str <#str description#>
@return <#return value description#>
*/
- (NSString *) turnBinarytoDecimal:(NSString *)str{
int sum = 0;
for (int i = 0; i < str.length; i++) {
sum *= 2;
char c = [str characterAtIndex:i];
sum += c - '0';
}
return [NSString stringWithFormat:@"%d",sum];
}
// 二进制转十进制
- (NSString *)toDecimalSystemWithBinarySystem:(NSString *)binary
{
int ll = 0 ;
int temp = 0 ;
for (int i = 0; i < binary.length; i ++)
{
temp = [[binary substringWithRange:NSMakeRange(i, 1)] intValue];
temp = temp * powf(2, binary.length - i - 1);
ll += temp;
}
NSString * result = [NSString stringWithFormat:@"%d",ll];
return result;
}
