#import <Foundation/Foundation.h>
int main(int argc, const char * argv[])
{
@autoreleasepool {
NSString *aPath = @"/Users/chenliang/DeskTop/desktop.ini";
NSData * aData = [NSData dataWithContentsOfFile:aPath];
void *pTest = malloc(100);
NSData *bData = [NSData dataWithBytes:pTest length:100];
NSData *cData = [@"hello" dataUsingEncoding:NSUTF8StringEncoding];
//NSNumber
NSNumber *aIntNumber = [NSNumber numberWithInt:10];
NSNumber *bFloatNumber = [NSNumber numberWithFloat:10.12f];
NSNumber *cBoolNumber = [NSNumber numberWithBool:YES];
NSNumber *dCharNumber = [NSNumber numberWithChar:'a'];
NSLog(@"%@ %@ %@ %@",aIntNumber,bFloatNumber,cBoolNumber,dCharNumber);//10 10.12 1 97
int aInt = [aIntNumber intValue];
float bFloat = [bFloatNumber floatValue];
BOOL cBool = [cBoolNumber boolValue];
char dChar = [dCharNumber charValue];
char *aString = malloc(1);
*aString = dChar;
NSLog(@"%d %.2f %d %s",aInt,bFloat,cBool,aString);//10 10.12 1 a
free(aString);
//简单的运算NSNumber的子类NSDecimalNumber
//9后11个零
NSDecimalNumber *aNumber = [NSDecimalNumber decimalNumberWithString:@"9e11"];
NSDecimalNumber *bNumber = [NSDecimalNumber decimalNumberWithMantissa:9 exponent:11 isNegative:NO];
NSLog(@"aNumber = %@",aNumber);
NSLog(@"bNumber = %@",bNumber);
NSLog(@"%@",[aNumber decimalNumberByAdding:bNumber]);//相加
//以NSNumber的方式来初始化NSDecimalNumber对象
aNumber = (NSDecimalNumber *)[NSDecimalNumber numberWithFloat:1280.21];
bNumber = (NSDecimalNumber *)[NSDecimalNumber numberWithInt:128];
NSLog(@"aNumber = %@",aNumber);
NSLog(@"bNumber = %@",bNumber);
NSLog(@"%@",[aNumber decimalNumberBySubtracting:bNumber]);//相减
//数字格式
NSNumberFormatter *format = [[NSNumberFormatter alloc]init];
NSNumber *numberTest = [NSNumber numberWithDouble:11122223333444.321321];
[format setNumberStyle:NSNumberFormatterDecimalStyle];
NSLog(@"NSNumberFormatterDecimalStyle = %@",[format stringFromNumber:numberTest]);//11,122,223,333,444.3
[format setNumberStyle:NSNumberFormatterNoStyle];//无格式
NSLog(@"NSNumberFormatterNoStyle = %@",[format stringFromNumber:numberTest]);//11122223333444
[format setNumberStyle:NSNumberFormatterCurrencyStyle];//货币
NSLog(@"NSNumberFormatterCurrencyStyle = %@",[format stringFromNumber:numberTest]);//￥11,122,223,333,444.30
[format setRoundingMode:NSNumberFormatterRoundDown];
[format setPositiveFormat:@"#,##0.###"];//#表示预设值，当数字没有此位时则舍去不补位，0表示位数，当数字没有此位时会以0去补位
NSNumber *n = [NSNumber numberWithFloat:123456.3211f];
NSLog(@"setPositiveFormat = %@",[format stringFromNumber:n]);//123,456.32
[format setPositiveFormat:@"0.##"];
NSLog(@"setPositiveFormat = %@",[format stringFromNumber:n]);//123456.32
[format setPositiveFormat:@"0.####"];
NSLog(@"setPositiveFormat = %@",[format stringFromNumber:n]);//123456.3203
[format setPositiveFormat:@"0.00"];
NSLog(@"setPositiveFormat = %@",[format stringFromNumber:n]);//123456.32
[format setPositiveFormat:@"0.0000"];
NSLog(@"setPositiveFormat = %@",[format stringFromNumber:n]);//123456.3203
//NSNumberFormatterPercentStyle 百分号
//NSNumberFormatterScientificStyle 科学技术法
//NSNumberFormatterSpellOutStyle 拼写
//NSNumberFormatterDecimalStyle 十进制
}
return 0;
}