A:=10;B:=50; FOR K:=A TO B DO BEGIN K:=K+1;{这一句是错误的!} WRITELN (K); END;A:=10;B:=50; FOR K:=A TO B DO BEGIN K:=K+1;{这一句是错误的!} WRITELN (K); END; 在pascal语言中怎么改正过来,