84669 person learning
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怎样将十六进制数转化为十进制数啊
Principle of custom conversion method:
十六进制数的第0位的权值为16的0次方,第1位的权值为16的1次方,第2位的权值为16的2次方…… 所以,在第N(N从0开始)位上,如果是是数 X (X 大于等于0,并且X小于等于 15,即:F)表示的大小为 X * 16的N次方. 假设有一个十六进数 2AF5,那么如何换算成10进制呢? 用竖式计算:2AF5换算成10进制: 第0位:5 * 16^0 = 5 第1位:F * 16^1 = 240 第2位:A * 16^2 = 2560 第3位:2 * 16^3 = 8192 +
Methods provided by C function:
iOS 十六进制字符串 转 十进制 UInt64 mac1 = strtoul([@"abcd1234" UTF8String], 0, 16); 如果在有溢出,使用下面方法: unsigned long long result = 0; NSScanner *scanner = [NSScanner scannerWithString:@"abcd12345678"]; [scanner scanHexLongLong:&result];
Principle of custom conversion method:
Methods provided by C function: