用程序计算一个整数的各位数字之和，在下划线处应填写的语句是( )。 SET TALK OFF INPUT "X=" TO X S=0 DO WHILE X! =0 S=S+MOD(X, 10) ENDDO s SET TALK ON
A．X=int(X/10)
B．X=int(X%10)
C．X=X-int(X/10)
D．X=X-int(X%10)
参考答案：A
解析： 首先用户输入一个数字保存到变量X中，使用一个DO WHILE循环语句来累加各位数字之和，判断条件是变量X是否等于0，如果为0，则退出循环，否则通过求余函数MOD得到变量X的个位数。因为题意要求计算各位数字之和，所以接下来应当将变量X除以 10并取整，使之缩小10倍，以便将变量X的十位数变成个位数，然后再次循环计算。
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