#include
#include
#define MAXTITL 40
#define MAXAUTL 40
#define MAXBKS 100
void sort_title(struct book *p, int count);
void sort_value(struct book *p, int count);
/* maximum number of books */
struct book { /* set up book template */
char title[MAXTITL];
char author[MAXAUTL];
float value;
};
int main(void)
{
struct book library[MAXBKS]; /* array of book structures */
int count = 0;
int index;
printf("Please enter the book title.\n");
printf("Press [enter] at the start of a line to stop.\n");
while (count < MAXBKS && gets(library[count].title) != NULL && library[count].title[0] != '\0')
{
printf("Now enter the author.\n");
gets(library[count].author);
printf("Now enter the value.\n");
scanf("%f", &library[count++].value);
while (getchar() != '\n')
continue; /* clear input line */
if (count < MAXBKS)
printf("Enter the next title.\n");
}
if (count > 0)
{
printf("Here is the list of your books:\n");
for (index = 0; index < count; index++)
printf("%s by %s: $%.2f\n", library[index].title, library[index].author, library[index].value);
printf("\nHere is the list of your books by title:\n");
sort_title(&library[0], count);
for (index = 0; index < count; index++)
printf("%s by %s: $%.2f\n", library[index].title, library[index].author, library[index].value);
printf("\nHere is the list of your books by value:\n");
sort_value(&library[0], count);
for (index = 0; index < count; index++)
printf("%s by %s: $%.2f\n", library[index].title, library[index].author, library[index].value);
}
else
printf("No books? Too bad.\n");
return 0;
}
void sort_title(struct book *p, int count)
{
int i,j;
struct book temp;
for(i=0; i
for(j=0; j
if( strcmp(p[j].title,p[j+1].title) > 0 )
{
temp = p[j] ;
p[j] = p[j+1] ;
p[j+1] = temp ;
}
}
void sort_value(struct book *p, int count)
{
int i,j;
struct book temp;
for(i=0; i
for(j=0; j
if( p[j].value > p[j+1].value )
{
temp = p[j] ;
p[j] = p[j+1] ;
p[j+1] = temp ;
}
}
编译通不过，注释掉函数声明以后编译通过了,为什么啊？
