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以下代码在Dev C++上编译运行通过。学习过程中，欢迎指教！

具体代码如下：

#include

#include

#include

#include

#define  BUFLEN         81

#define  MORELEN        20

char delimiters[] = " \".,;;!?)(\n";

bool Seek_word(char *more, char *filename);

unsigned int Word_count(char *filename);

char *Most_words(char *filename, unsigned int count, char *data);

char *Word(char more[][MORELEN], unsigned int count, char *data);

int main(void)

{

char buf[BUFLEN] = "\0";

char more[MORELEN] = "\0";

char data[MORELEN] = "\0";

char filename[FILENAME_MAX] = "myfile.txt";

FILE *pfile = NULL;

unsigned int count = 0;

printf("该程序能将英文文章存储在myfile.txt文件中！\n");

printf("能在存储的文件中查找给定的单词是否存在！\n");

printf("也能够统计存储的文件中英文单词的数量和出现频率最高的单词！\n");

printf("注意：该程序统计单词时，是区分大小的。如：“And”与“and”是两个单词！\n");

if((pfile = fopen(filename, "w")) == NULL)

{

printf("打开 %s 文件失败！\n\a\a\a", filename);

exit(1);

}

setvbuf(pfile, NULL, _IOFBF, BUFSIZ);

printf("\n现在请从键盘输入要存储在myfile.txt文件中的英文文章：\n");

while(true)

{

fgets(buf, BUFLEN, stdin);

if(buf[0] == '\n')

break;

if(EOF == fputs(buf, pfile))

{

printf("写入 %s 文件错误！\n\a\a\a", filename);

exit(1);

}

}

fclose(pfile);

pfile = NULL;

printf("\n请输入要查找的单词： ");

scanf(" %s", more);

if(Seek_word(more, filename))

printf("\n%s有在文章中！", more);

else

printf("\n%s没有在文章中！", more);

printf("\n该文件中英文单词的数量为：%u!\n", Word_count(filename));

count = Word_count(filename);

printf("\n该文件中出现频率最高的单词为：%s!\n", Most_words(filename, count, data));

return 0;

}

bool Seek_word(char *more, char *filename)

{

FILE *pfile = NULL;

char buf[BUFLEN] = "\0";

if(!(pfile = fopen(filename, "r")))

{

printf("打开 %s 文件失败！\n\a\a\a", filename);

exit(1);

}

setvbuf(pfile, NULL, _IOFBF, BUFSIZ);

while(true)

{

if(!fgets(buf, BUFLEN, pfile))

break;

char *pWord = strtok(buf, delimiters);

if(pWord)

{

do

{

if(strcmp(pWord, more) == 0)

{

fclose(pfile);

pfile = NULL;

return true;

}

pWord = strtok(NULL, delimiters);

}

while(pWord);

}

}

fclose(pfile);

pfile = NULL;

return false;

}

unsigned int Word_count(char *filename)

{

FILE *pfile = NULL;

char buf[BUFLEN] = "\0";

unsigned int count = 0;

if(!(pfile = fopen(filename, "r")))

{

printf("打开 %s 文件失败！\n\a\a\a", filename);

exit(1);

}

setvbuf(pfile, NULL, _IOFBF, BUFSIZ);

while(true)

{

if(!fgets(buf, BUFLEN, pfile))

break;

char *pWord = strtok(buf, delimiters);

if(pWord)

{

do

{

++count;

pWord = strtok(NULL, delimiters);

}

while(pWord);

}

}

fclose(pfile);

pfile = NULL;

return count;

}

char *Most_words(char *filename, unsigned int count, char *data)

{

FILE *pfile = NULL;

char buf[BUFLEN] = "\0";

char more[count][MORELEN];

unsigned int count1 = 0;

if(!(pfile = fopen(filename, "r")))

{

printf("打开 %s 文件失败！\n\a\a\a", filename);

exit(1);

}

setvbuf(pfile, NULL, _IOFBF, BUFSIZ);

while(true)

{

if(!fgets(buf, BUFLEN, pfile))

break;

char *pWord = strtok(buf, delimiters);

if(pWord)

{

do

{

strcpy(more[count1++], pWord);

pWord = strtok(NULL, delimiters);

}

while(pWord);

}

}

fclose(pfile);

pfile = NULL;

strcpy(data, Word(more, count, data));

return data;

}

char *Word(char more[][MORELEN], unsigned int count, char *data)

{

int i = 0, j = 0;

int max = 0;

for(i = 0; i < count; ++i)

{

int n = 0;

for(j = 0; j < count; ++j)

{

if((strcmp(more[i], more[j])) == 0)

++n;

}

if(n > max)

{

strcpy(data, more[i]);

max = n;

}

}

return data;

}

还在学习过程中，欢迎指教！