#include <stdio.h> #include <stdlib.h> typedef struct { char name[100]; int price; }book; int down(const void* a, const void* b) { return (((book*)a)->price) - (((book*)b)->price); } int main() { int n = 0; scanf("%d", &n); book arr[10] = { 0 }; int i = 0; for( i=0;i&...