从键盘输入一个实数和一个字符，若字符为大写字母。则输出该数单位为度时的sin值；若字符为小写字母，则输出该数单位为弧度时的sin值。否则，输出提示信息，并询问是否再输入一次，若是，则重复以上操作；否则结束。-Keyboard input from a real number and a character, if the characters for the uppercase letters. The output of the number of units for the degrees of sin value　if characters to lowercase letters, while the output of the number of units of radian value at the time of sin. Otherwise, the output message, and asked whether to enter the time, and if so, repeat the above operation　otherwise end.