#include <stdio.h>
#include <stdlib.h>
#define MAXTITL 40
#define MAXAUTH 40
#define MAXBKS 10
struct book {
char title[MAXTITL];
char author[MAXAUTH];
float value;
};
int main(void){
struct book library[MAXBKS];
int count=0;
int index,filecount;
FILE *pbooks;
int size=sizeof(struct book);
if((pbooks=fopen("book.dat","a+b"))==NULL){
fputs("Can't open book.dat file.\n",stderr);
exit(1);
}
rewind(pbooks);
while(count<MAXBKS&&fread(&library[count],size,1,pbooks)==1){
if(count==0){
puts("Current contents of book.dat:");
}
printf("%s by %s:$%.2f\n",library[count].title,library[count].author,library[count].value);
count++;
}
filecount=count;
if(count==MAXBKS){
fputs("The book.dat file is full.",stderr);
exit(2);
}
puts("Please add new book titles.");
puts("Press [enter] at the start of a line to stop.");
while(count<MAXBKS&&gets(library[count].title)!=NULL&&library[count].title[0]!='\0'){
puts("Now enter the author.");
gets(library[count].author);
puts("Now enter the value.");
scanf("%f",&library[count++].value);
while(getchar()!='\n'){
continue;
}
if(count<MAXBKS){
puts("Enter the next title.");
}
}
if(count>0){
puts("Here is the list of your books:");
for(index=0;index<count;index++){
printf("%s by %s:$%.2f\n",library[index].title,library[index].author,library[index].value);
fwrite(&library[filecount],size,count-filecount,pbooks);
}
}else{
puts("No books? too bad.\n");
}
puts("Bye.\n");
fclose(pbooks);
return 0;
#include <stdlib.h>
#define MAXTITL 40
#define MAXAUTH 40
#define MAXBKS 10
struct book {
char title[MAXTITL];
char author[MAXAUTH];
float value;
};
int main(void){
struct book library[MAXBKS];
int count=0;
int index,filecount;
FILE *pbooks;
int size=sizeof(struct book);
if((pbooks=fopen("book.dat","a+b"))==NULL){
fputs("Can't open book.dat file.\n",stderr);
exit(1);
}
rewind(pbooks);
while(count<MAXBKS&&fread(&library[count],size,1,pbooks)==1){
if(count==0){
puts("Current contents of book.dat:");
}
printf("%s by %s:$%.2f\n",library[count].title,library[count].author,library[count].value);
count++;
}
filecount=count;
if(count==MAXBKS){
fputs("The book.dat file is full.",stderr);
exit(2);
}
puts("Please add new book titles.");
puts("Press [enter] at the start of a line to stop.");
while(count<MAXBKS&&gets(library[count].title)!=NULL&&library[count].title[0]!='\0'){
puts("Now enter the author.");
gets(library[count].author);
puts("Now enter the value.");
scanf("%f",&library[count++].value);
while(getchar()!='\n'){
continue;
}
if(count<MAXBKS){
puts("Enter the next title.");
}
}
if(count>0){
puts("Here is the list of your books:");
for(index=0;index<count;index++){
printf("%s by %s:$%.2f\n",library[index].title,library[index].author,library[index].value);
fwrite(&library[filecount],size,count-filecount,pbooks);
}
}else{
puts("No books? too bad.\n");
}
puts("Bye.\n");
fclose(pbooks);
return 0;
}
本文转sinojelly51CTO博客，原文链接：http://blog.51cto.com/pnig0s1992/412492，如需转载请自行联系原作者
