自增和自减操作符
自增自减操作符是可以直接改变 变量值的操作符
前加加 和 前减减
后加加 和 后减减
其实是一个 +1(或 -1 ) 操作和一个赋值操作的缩写
int a = 1 ;
System . out. println ( "a++=" + a++ ) ;
System . out. println ( "a=" + a) ;
System . out. println ( "++a=" + ++ a) ;
System . out. println ( "a=" + a) ;
int b = 10 ;
System . out. println ( "b--=" + b-- ) ;
System . out. println ( "b=" + b) ;
打印26个连续的字符
程序中的知识点
自动类型转换:char 到 int
强制类型转换:int 到 char
字符和数字的对应关系,字符集和编码
字符串的加法:任何数据和字符串都可以相加,将这个数据的字符串和另一个字符串拼接起来
自增操作符
char ch = 'A' ;
int num = ch;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
System . out. println ( num + "\t" + ( ( char ) num++ ) ) ;
找到可以被整除的数
程序中的知识点
取模运算: 整数的取模运算
布尔运算:==
操作符
自增运算
int dividend = 35 ;
int divisor = 9 ;
System . out. println ( dividend + "可以整除" + divisor + "吗?" + ( ( dividend++ ) % divisor == 0 ) ) ;
System . out. println ( dividend + "可以整除" + divisor + "吗?" + ( ( dividend++ ) % divisor == 0 ) ) ;