Напишите пожалуйста программу на Си

 #include  

#include  

#include  

#define BUFFER 0x400 

#define SIZEBOX 0x100 

char char_max(const char* box) { 

    size_t index = 0; 

    size_t i = 0; 

    while (++i < SIZEBOX) if (box[i] > box[index]) index = i; 

    return (char)index; 

} 

int main(void) { 

    char line[BUFFER]; 

    gets_s(line, BUFFER); 

    const char* delim = " "; 

    char* word = NULL; 

    char* context = NULL; 

    char box[SIZEBOX] = { 0 }; 

    char letter; 

    word = strtok_s(line, delim, &context); 

    while (word != NULL) { 

        ++box[word[strlen(word) - 1]]; 

        word = strtok_s(NULL, delim, &context); 

    } 

    letter = char_max(box); 

    printf("Letter: %c", letter); 

    system("pause > nul"); 

    return 0; 

} 

 

 #include  

 

const char bukvy[] = "aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ"; 

 

int is_bukva(const char c) 

{ 

 for(int x = 0; bukvy[x]; x++) 

  if(c == bukvy[x]) 

   return 1; 

 return 0; 

} 

 

int main() 

{ 

 const int size = 1000; 

 char s[size]; 

 int i,j, count[26] = {0}, max = 0, i_max = 0; 

 

 fgets(s,size,stdin); 

 

 for(i = 0; s[i]; i++) 

 { 

  if(is_bukva(s[i]) && s[i]) 

   while(is_bukva(s[i]) && s[i]) 

    i++; 

  for(j = 0; bukvy[j]; j++) 

   if(s[i-1] == bukvy[j]) 

   { 

    count[(j)/2]++; 

   } 

 } 

 

 for(j = 0; j < 26; j++) 

 { 

  if(max < count[j]) 

  { 

   i_max = j; 

   max = count[j]; 

  } 

 } 

 

 printf("%c\n",bukvy[i_max*2]); 

 

 return 0; 

} 

 #include  

#include  

#include  

 

#define BUFFER_SIZE 512 

 

int main(void) 

{ 

    int i; 

    char buffer[BUFFER_SIZE]; 

    size_t chars['z'] = {0}; 

    char frequent = 'a'; 

     

    if (fgets(buffer, BUFFER_SIZE, stdin)) { 

        for (i = 0; i < strlen(buffer); i++) { 

            switch (buffer[i + 1]) { 

            case '\0': 

            case ' ': 

                chars[buffer[(i++)]]++; 

            } 

        } 

    } 

     

    for (i = 'a'; i < 'z'; i++) { 

        if (chars[frequent] < chars[i]) 

            frequent = i; 

    } 

     

    printf("frequent: %c\n", frequent); 

    return 0; 

} 

 

// one two three four five six seven eight nine ten      

// frequent: e