[计算机类试卷]国家二级(C语言)机试模拟试卷308及答案与解析.doc

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1、国家二级( C语言)机试模拟试卷 308及答案与解析 一、程序填空题( 30分) 1 给定程序中,函数 fun的功能是:将形参 n中,各位上为偶数的数取出,并按原来从高位到低位相反的顺序组成一个新的数,并作为函数值返回。 例如。输入一个整数: 27638496,函数返回值为: 64862。 请在程序的下划线处填入正确的内容并把下划线删除,使程序得出正确的结果。 注意:源程序存放在考生文件夹下的 BLANKI C中。 不得增行或删行,也不得更改程序的结构 ! #include unsigned long fun(unsigned long n) unsigned long x=0; int t;

2、 while(n) t=n 10; *found* if(t 2= 【 1】 ) *found* x= 【 2】 +t; *found* n= 【 3】; return x; main() unsigned long n= 1 ; while(n99999999| n #define M 5 *found* int fun(int n, int xx) int i, j, sum=0; prLntf(“ nThe d x d matrix: n“, M, M); for(i=0; i=eps)精度判断 pi+=s; pi存放累加和 t=n (2*n+1);每一项 s*=t; 累积 n+; pi=pi*2; /求得 值 return pi; 【试 题解析】 进入 fun函数,根据前面的分析: (1)根据题意,需要把每一项累加起来;若每一累加项的值放在 t中,后一项等于前一项累加项的值乘以 n/(2*n+1)来求得。 (2)根据公式将求到的 2的值放到变量 pi中,每累加一次, n的值就增加 1,以便求下一个累加项,不断重复,直到满足题目中的精度要求。

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