1.定义枚举类型monthtype表示十二个月，输入1-12中的某一个数，输出对应月份的英文缩写和表示写一个月的数字。如：
输入 6
输出 jun next month ：7
program ex01;
type month=(jan,feb,mar,apr,may,jun,jul,aug,sep,oct,nov,dec);
var m,n:month;
k:1..12;
begin
write('input number:');readln(k);
case k of
1:m:=jan;
2:m:=feb;
3:m:=mar;
4:m:=apr;
5:m:=may;
6:m:=jun;
7:m:=jul;
8:m:=aug;
9:m:=sep;
10:m:=oct;
11:m:=nov;
12:m:=dec;
end;
if m=dec then n:=jan esle n:=succ(m);
case m of
jan:writeln('jan','next month:',ord(n)+1);
feb:writeln('feb','next month:',ord(n)+1);
mar:writeln('mar','next month:',ord(n)+1);
apr:writeln('apr','next month:',ord(n)+1);
may:writeln('may','next month:',ord(n)+1);
jun:writeln('jun','next month:',ord(n)+1);
jul:writeln('jul','next month:',ord(n)+1);
aug:writeln('aug','next month:',ord(n)+1);
sep:writeln('sep','next month:',ord(n)+1);
oct:writeln('oct','next month:',ord(n)+1);
nov:writeln('nov','next month:',ord(n)+1);
dec:writeln('dec','next month:',ord(n)+1);
end;
end.
2.由五个字符组成一个字符串，规定前四个字符为小写字母。第五个字符为数字，问有多少种排列方法。
program ex02;
type ch='a'..'z';d='0'..'9';
var k1,k2,k3,k4:ch;
k5:d;
n:longint;
begin
n:=0;
for k1:='a' to 'z' do
for k2:='a' to 'z' do
for k3:='a' to 'z' do
for k4:='a' to 'z' do
for k5:='0' to '9' do
n:=n=1;
writeln('total:',n);
end.
