从一个C语言源程序文件中，统计出该C程序中使用的关键字及其频率。统计结果表格保存到文件keyword.txt中。

#include<stdio.h>#include<stdlib.h>#include<iostream.h>#include<string.h>

#define KEYNUM 32                                      //c语言中的关键字个数 32#define KEYMAX 8                                       //最大关键字字节个数 8

const char Key[KEYNUM][KEYMAX+1]=                      //把32个关键字存储在二维数组Key中{ "auto","break","case","char","const","continue","default","do","double",  "else","enum","extern","float","for","goto","if","int","long","register",  "return","short","signed","sizeof","static","struct","switch","typedef",  "union","unsigned","void","volatile","while"};

const char split[26]=" ();'~:+-<>_.|/{,!#&*///"/t/n";  //分割依据：源程序中可能出现的所有字符

void welcome();void statistics();

void welcome()                                         //欢迎界面{ printf("┏━━━━━━━━━━━━━━━━━━━━━━━━━━━┓/n");                             printf("┃    ▲                                         ▲     ┃/n"); printf("┃    ■▁▁欢迎使用统计C程序关键字频率程序▁▁▁■     ┃/n"); printf("┃    ╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬    ┃/n"); printf("┃                                                      ┃/n"); printf("┃                                                      ┃/n"); printf("┃      注意：统计结果默认保存在C://keyword.txt中        ┃/n");  printf("┃                                                      ┃/n");   printf("┗━━━━━━━━━━━━━━━━━━━━━━━━━━━┛/n");}

void statistics()                                         //统计函数{    FILE *fp1,*fp2;    int num = 0,i,j = 0,k;    char cha[250],che[250];  char *p; char filename[20];  printf("请输入文件名及路径:/n");                     //输入所要统计的源程序文件路径 scanf("%s",filename);    printf("The result :/n");

 if((fp1=fopen(filename,"r"))==NULL)               //打开源程序文件 {  printf("Can not open flie/n");  exit(1); }

 if((fp2=fopen("c://keyword.txt","w"))==NULL)      //打开或新建存储统计结果的文件c://keyword.txt {  printf("Can not open flie/n");  exit(1); }

 for(k=0;k<KEYNUM;k++) {   while(!feof(fp1))  {      fgets(cha,sizeof(cha),fp1);               //从源程序文件中分块获取指定字节内容   strcpy(che,cha);   p = strtok(che,split);      while(p!=NULL)   {    strcpy(che,cha);    p = strtok(che,split);                //按照分割依据将获取内容进行分割,并存储在che中        for(i=0;i<j;i++)    {     p=strtok(NULL,split);    }        if(p!=NULL)    {     if(strcmp(p,Key[k])==0)                //分割取出的字符串与关键字比较，如果相同计数加一     {      num++;     }    }    j++;   }     j=0;  }          rewind(fp1);                                 //比较完一个关键字，指针返回源程序文件开头          printf("%-10s]/n",Key[k],num);             //将统计结果显示在屏幕上  fprintf(fp2,"%-10s]/n",Key[k],num);        //将统计结果记录在指定文件中    num=0; }   fclose(fp1);                                     //关闭源程序文件 fclose(fp2);                                     //关闭记录统计结果的文件 }

int main()                                           //主函数{ welcome();                                       //调用欢迎界面函数 statistics();                                    //调用统计函数  return 0;}