1. NSInteger打印以及字符串的转换
使用%zd打印NSInteger, %tu打印NSUInteger
NSInteger integer = 1;
NSLog(@"first number: %zd", integer);
NSUInteger uinteger = 1;
NSLog(@"second number: %tu", uinteger);
使用%zd打印NSInteger, %tu打印NSUInteger
NSInteger integer = 1;
NSLog(@"first number: %zd", integer);
NSUInteger uinteger = 1;
NSLog(@"second number: %tu", uinteger);