iOS格式化字符串

        //%@ 字符串输出
        //%% 输出%这个字符
        int a = -1;
        NSLog(@"有符号32输出＝%d",a);
        NSLog(@"有符号32输出＝%D",a);
        NSLog(@"有符号32输出＝%i",a);
        
        unsigned int b = 2;
        NSLog(@"无符号32输出＝%u",b);
        NSLog(@"无符号32输出＝%U",b);
        
        short int c = 3;
        NSLog(@"有符号16输出＝%hi",c);
        unsigned short int d = 4;
        NSLog(@"无符号16输出＝%hu",d);
        
        long long e = 5;
        NSLog(@"有符号64输出＝%qi",e);
        unsigned long long f = 6;
        NSLog(@"无符号64输出＝%qu",f);
        
        unsigned int g = 7;
        NSLog(@"无符号32位16进制小写输出＝%x",g);
        NSLog(@"无符号32位16进制大写输出＝%X",g);
        
        unsigned long long h = 8;
        NSLog(@"无符号64位16进制小写输出＝%qx",h);
        NSLog(@"无符号64位16进制大写输出＝%qX",h);
        
        unsigned int i = 9;
        NSLog(@"无符号64位8进制小写输出＝%o",i);
        NSLog(@"无符号64位8进制小写输出＝%O",i);
        
        double j = 10;
        NSLog(@"有符号64位双精度输出＝%f",j);
        NSLog(@"有符号64位双精度科学计数法小写输出＝%e",j);
        NSLog(@"有符号64位双精度科学计数法大写输出＝%E",j);
        
        double k = 1000000;
        NSLog(@"有符号64位双精度智能科学计数输出＝%g",k);
        NSLog(@"有符号64位双精度智能科学计数输出＝%G",k);
        
        unsigned char l = 65;
        NSLog(@"8位＝%c",l);
        
        unichar m = 0x0042;
        NSLog(@"16位＝%C",m);
        
        char *n = "hello world";
        NSLog(@"8位＝%s",n);
        
        NSString *p = @"p";
        NSLog(@"指针：%p",p);