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全国计算机等级考试二级C语言上机题51

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[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51

已知数据文件in.dat中存有200个四位数,并已调用读函数readdat()把这些数存入数组a中,请考生编制一函数jsval(),其功能是:把千位数字和十位数字重新组成一个新的十位数(新十位数的十位数字是原四位数的千位数字,新十位数的个位数字是原四位数的十位数字),以及把个位数字和百位数字组成另一个新的十位数(新十位数的十位数字是原四位数的个位数字,新十位数的个位数字是原四位数的百位数字),如果新组成的两个十位数均是素数且新数的十位数字均不为零,则将满足此条件的四位数按从大到小的顺序存入数组b中,并要计算满足上述条件的四位数的个数cnt。后main()函数调用写函数writedat()把结果cnt以及数组b中符合条件的四位数输出到out.dat文件中。

 注意:部分源程序存在文件prog1.c中。

 程序中已定义数组:a[200],b[200],已定义变量:cnt

 请勿改动数据文件in.dat中的任何数据、主函数main()、读函数readdat()和写函数writedat()的内容。

&emspinclude

&emspdefine max 200

int a[max], b[max], cnt = 0 ;



int isprime(int m)

{int i;

 for(i=2;i

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