[职称英语等级考试模拟题理工类ＡＢ级]第1部分 词汇 选择（第1-15题，每题1分，共15分，建议10分钟以内完成）下面共有15句子，每个句子均有一个词或短语划有底横线，请从每个句子后面所给的四个选项中选择一个与划线部分意义...+阅读
☆题目21下列程序prog1.c的功能是：利用以下所示的简单迭代方法求方程：cos(x)-x=0的一个实根。
xn+1=cos(xn)
迭代步骤如下：
(1)取x1初值为0.0；
(2)x0=x1，把x1的值赋给x0；
(3)x1=cos(x0)，求出一个新的x1；
(4)若x0-x1的绝对值小于0.000001，执行步骤(5)，否则执行步骤(2)；
(5)所求x1就是方程cos(x)-x=0的一个实根，作为函数值返回。
请编写函数countvalue()实现程序的要求，后调用函数writedat()把结果输出到文件out17.dat中。
部分源程序已给出。
请勿改动主函数main()和输出数据函数writedat()的内容。
&emspinclude
&emspinclude
&emspinclude
floa
t countvalue()
{ float x0,x1;
x1=0.0;
do{ x0=x1;
x1=cos(x0);
}while(fabs(x0-x1)>=0.000001);
return x1;
}
main()
{
clrscr();
printf("实根=%f\n",countvalue());
printf("%f\n",cos(countvalue())-countvalue());
writedat();
}
writedat()
{
file *wf;
wf=fopen("out17.dat","w");
fprintf(wf,"%f\n",countvalue());
fclose(wf);
}
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