Read book information and prints the book descriptions in the order entered, then alphabetized by title, and then in order of increased value. - C Structure

C examples for Structure:Structure Value

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Description

Read book information and prints the book descriptions in the order entered, then alphabetized by title, and then in order of increased value.

Demo Code

#include <stdio.h>  
#include <string.h>  
char * s_gets(char * st, int n);  
#define MAXTITL   40  //ww w.  jav  a2  s .  co  m
#define MAXAUTL   40  
#define MAXBKS   100            /* maximum number of books  */  
struct book {                   /* set up book template     */  
    char title[MAXTITL];  
    char author[MAXAUTL];  
    float value;  

};  
  
void sortt(struct book * pb[], int n);  
void sortv(struct book * pb[], int n);  
  
int main(void)  
{  
     struct book my[MAXBKS]; /* array of book structures */  
     struct book * pbk[MAXBKS];   /* pointers for sorting     */  
     int count = 0;  
     int index;  
  
     printf("Please enter the book title. Press [enter] at the start of a line to stop.\n");  
     while (count < MAXBKS && s_gets(my[count].title, MAXTITL) != NULL  && my[count].title[0] != '\0')  
     {  
          printf("author:\n");  
          s_gets(my[count].author, MAXAUTL);  
          printf("value:\n");  
          scanf("%f", &my[count].value);  
          pbk[count] = &my[count];  
          count++;  
          while (getchar() != '\n')  
               continue;                /* clear input line */  
          if (count < MAXBKS)  
          printf("Enter the next title.\n");  
     }  
     printf("Here is the list of your books:\n");  
     for (index = 0; index < count; index++)  
         printf("%s by %s: $%.2f\n", my[index].title, my[index].author, my[index].value);  
            
     printf("Here is the list of your books sorted by title:\n");  
     sortt(pbk, count);  
     for (index = 0; index < count; index++)  
         printf("%s by %s: $%.2f\n", pbk[index]->title, pbk[index]->author, pbk[index]->value);  
     sortv(pbk, count);  
     printf("Here is the list of your books sorted by value:\n");  
     for (index = 0; index < count; index++)  
         printf("%s by %s: $%.2f\n", pbk[index]->title, pbk[index]->author, pbk[index]->value);  
  
     return 0;  
}  
  
void sortt(struct book * pb[], int n)  
{  
   int top, search;  
   struct book * temp;  
  
   for (top = 0; top < n -1; top++)  
       for (search = top + 1; search < n; search++)  
            if (strcmp(pb[search]->title, pb[top]->title) < 0) {  
                 temp = pb[search];  
                 pb[search] = pb[top];  
                 pb[top] = temp;  
            }  
}  
  
void sortv(struct book * pb[], int n)  
{  
   int top, search;  
   struct book * temp;  
  
   for (top = 0; top < n -1; top++)  
       for (search = top + 1; search < n; search++)  
            if (pb[search]->value < pb[top]->value)  
            {  
                 temp = pb[search];  
                 pb[search] = pb[top];  
                 pb[top] = temp;  
            }  
}  
  
char * s_gets(char * st, int n)  
{  
    char * ret_val;  
    char * find;  
      
    ret_val = fgets(st, n, stdin);  
    if (ret_val)  
    {  
        find = strchr(st, '\n');   // look for newline  
        if (find)                  // if the address is not NULL,  
            *find = '\0';          // place a null character there  
        else  
            while (getchar() != '\n')  
                continue;          // dispose of rest of line  
    }  
    return ret_val;  
}

Result


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