如何转换NSNumber对象用于计算目的？

NSNumber *number = @(42);
int intValue = [number intValue];

NSNumber *number = @(3.14);
float floatValue = [number floatValue];

NSNumber *number = @(3.14);
double doubleValue = [number doubleValue];

NSNumber *number = @(3.14);
float floatValue = [number floatValue];
double doubleValue = [number doubleValue];

NSNumber *number = @(3.14);
NSDecimal decimalValue = [number decimalValue];

NSNumber *number = @(42);
int integerValue = [number integerValue];

NSNumber *number = @(42);
unsigned int unsignedIntegerValue = [number unsignedIntegerValue];

NSNumber *number = @(42);
long longValue = [number longValue];

NSNumber *number = @(42);
unsigned long unsignedLongValue = [number unsignedLongValue];

NSNumber *number = @(42);
long long longLongValue = [number longLongValue];

NSNumber *number = @(42);
unsigned long long unsignedLongLongValue = [number unsignedLongLongValue];