第1题
编制程序PROG1.BAS其功能是：计算表达式1!+2!+3!+...+k!,计算k=6时的值。请根据程序的需要将函数FACT补充完整。
Prog1.bas
DECLARE FUNCTION FACT(t)
OPEN "QB12.DAT" FOR OUTPUT AS #1
sum = 0
INPUT k
FOR i = 1 TO k
sum = sum + FACT(i)
NEXT
PRINT "sum="; sum
PRINT #1, sum
CLOSE #1
END
FUNCTION FACT(t)
END FUNCTION
编程题参考答案程序
DECLARE FUNCTION FACT (t)
OPEN "QB12.DAT" FOR OUTPUT AS #1
sum = 0
INPUT k
FOR i = 1 TO k
sum = sum + FACT(i)
NEXT
PRINT "sum="; sum
PRINT #1, sum
CLOSE #1
END
FUNCTION FACT (t)
mm = 1
FOR j = 1 TO t
mm = mm * j
NEXT
FACT = mm
END FUNCTION
第2题
编制程序PROG1.BAS其功能是：求 1*5*10*15*...*30 的准确值，将结果保存在文件QB22.DAT中。请将程序补充完整。
OPEN "QB22.DAT" FOR OUTPUT AS #1
DIM t AS LONG
参考答案程序
OPEN "QB22.DAT" FOR OUTPUT AS #1
DIM t AS LONG
CLS
t = 1
FOR i = 5 TO 30 STEP 5
t = t * i
PRINT i
NEXT
PRINT t
PRINT #1, t
CLOSE #1
END
第3题
编制程序PROG1.BAS其功能是：求自然对数的底e 的近似值。其前十项的计算公式为：
e(10)=1+1+1/(1*2)+1/(1*2*3)+...+1/(1*2*3*...*10)
请在程序的【1】、【2】和【3】处填写适当的内容。
Prog1.bas
e = 【1】
t= 1
FOR j = 1 TO 10
t = t/【2】
e = e + t
NEXT j
PRINT 【3】
END
参考程序答案
e = 1
t= 1
FOR j = 1 TO 10
t = t/j
e = e + t
NEXT j
PRINT e
END
第4题
编制程序PROG1.BAS其功能是：求下式和s=a+aa+aaa+…+a…a,
其中a表示0至9间一个数字。计算a=8时4项和，写到文件"QB42.DAT"
中。请编写函数item实现此功能。
Prog1.bas
DECLARE FUNCTION item(a,k)
a = 8: n = 4
FOR j = 1 TO n
sum = sum + item(a,j)
NEXT j
PRINT "Sum=";sum
OPEN "QB42.DAT" FOR OUTPUT AS #1
PRINT #1, sum
CLOSE #1
END
FUNCTION item(a,k)
END FUNCTION
参考程序答案
DECLARE FUNCTION item (a, k)
a = 8: n = 4
FOR j = 1 TO n
sum = sum + item(a, j)
NEXT j
PRINT "Sum="; sum
OPEN "QB42.DAT" FOR OUTPUT AS #1
PRINT #1, sum
CLOSE #1
END
FUNCTION item (a, k)
mm = a
FOR i = 2 TO k
mm = mm * 10 + a
NEXT
item = mm
END FUNCTION
第5题
编制程序PROG1.BAS其功能是：打印下列图形。
A
AAA
AAAAA
AAAAAAA
BBBBBBB
BBBBB
BBB
B
请在程序的【1】、【2】和【3】处填写适当的内容。
Prog1.bas
FOR K=1 TO 4
FOR J=1 TO 2*K-1
PRINT 【1】
NEXT J
PRINT
NEXT K
FOR K=4 TO 1 【2】
FOR J=1 TO K*2-1
PRINT 【3】
NEXT J
PRINT
NEXT K
END
参考程序答案
FOR K=1 TO 4
FOR J=1 TO 2*K-1
PRINT "A";
NEXT J
PRINT
NEXT K
FOR K=4 TO 1 STEP -1
FOR J=1 TO K*2-1
PRINT "B";
NEXT J
PRINT
NEXT K
END
第6题
编制程序PROG1.BAS其功能是：从成绩文件"GRADE.TXT"中读入若干学生某一门课的成绩，计算并输出其平均值。
程序有【1】、【2】及【3】三处需要补充完整。请将程序调试出所需结果。
Prog1.bas
OPEN "GRADE.TXT" FOR INPUT AS #1
DO WHILE NOT EOF(1)
【1】 #1,G
N=N+1
S=S+G
【2】
CLOSE #1
S=S/【3】
PRINT "Mean=";S
END
参考程序答案
OPEN "GRADE.TXT" FOR INPUT AS #1
DO WHILE NOT EOF(1)
INPUT #1,G
N=N+1
S=S+G
LOOP
CLOSE #1
S=S/N
PRINT "Mean=";S
END
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