程序代码：

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

char *get_first_character(char *name);

int main(void)
{
    char first_name[10], middle_name[10], last_name[10];
    char *final1, *final2;
    
    final1 = (char *)malloc(30 * sizeof(char));
    final2 = (char *)malloc(3 * sizeof(char));
    
    puts("Please enter your first name:");
    gets(first_name);
    puts("Please enter your middle name:");
    gets(middle_name);
    puts("Please enter your last name:");
    gets(last_name);
    printf("%c", first_name[0]);
    final1 = get_first_character(first_name);
    puts(final1);
    final2 = get_first_character(middle_name);
    puts(final2);
    strcat(final1, final2);
    puts(final1);
    strcat(final1, last_name);
    puts(final1);
    
    printf("Now the result is %s\n", final1);

    return(0);
}

char *get_first_character(char name[])
{
    char name1[3];
    
    if(name[0] < 'z' && name[0] > 'a')
        name1[0] = name[0] - 32;
    else
        name1[0] = name[0];

    name1[1] = '.';
    name1[2] = '\0';

    return(name1);
}