浙江大学城市学院c语言上机

⑴ 镆充缪娴欐睙澶у﹀煄甯傚﹂櫌 鍓鏁欐巿

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⑵ C璇瑷 姹备袱锘庡竞闂磋窛绂

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define SIZE 3
#define pi 3.14
typedef struct city{
char Cname[21];
float Lat;
float Lon;
} CITY;

typedef struct {
int Nb_cities;
CITY Cities[SIZE];
} CITIES_LIST;

void main(){
FILE * fp;
CITIES_LIST list, list1;
int i,j,a[SIZE],b[SIZE],n1,n2,tem,tem1;
float d,dis;
if((fp=fopen("citylist","wb+"))==NULL){
printf("file open error");
exit(0);
}
printf("杈揿叆锘庡竞涓鏁\n");
scanf("%d",&list.Nb_cities);
printf("杈揿叆锘庡竞钖嶅强鍏剁粡绾搴\n");
for(i=0;i<SIZE;i++){
scanf("%s%f%f",list.Cities[i].Cname,&list.Cities[i].Lat,&list.Cities[i].Lon);
fwrite(&list.Cities[i],sizeof(struct city),1,fp);
}

fclose(fp);

if((fp=fopen("citylist","rb"))==NULL){
printf("file open error");
exit(0);
}
printf("镓链夊煄甯傚垪琛\n");
for(i=0;i<SIZE;i++){
fread(&list1.Cities[i],sizeof(struct city),1,fp);
printf("%s %6.2f%6.2f",list1.Cities[i].Cname,list1.Cities[i].Lat,list1.Cities[i].Lon);
printf("\n");
}
printf("\n");

fclose(fp);
i=0;

printf("杈揿叆鐩镙囧煄甯傜紪鍙凤纴浠-1缁撴潫");
printf("\n");
while(a[i]!=-1&&i<SIZE){
scanf("%d",&a[i]);
i++;
}
n1=i;
i=0;

printf("杈揿叆璧峰嫔煄甯傜紪鍙凤纴浠-1缁撴潫\n");
while(b[i]!=-1&&i<SIZE){
scanf("%d",&b[i]);
i++;
}

n2=i;
printf("DESTINATION ");
for(i=0;i<n1;i++){
tem=a[i];
printf("%s ",list1.Cities[tem].Cname);
}
printf("\n");

for(i=0;i<n2;i++){
tem=b[i];
printf("%s ",list1.Cities[tem].Cname);
for(j=0;j<n1;j++){
tem1=a[j];
dis=6378*(acos(cos(list1.Cities[tem].Lat/pi)*cos(list1.Cities[tem1].Lat/pi)*cos(list1.Cities[tem].Lat/pi-list1.Cities[tem1].Lat/pi)+sin(list1.Cities[tem].Lat/pi)*sin(list1.Cities[tem1].Lat/pi)));;
printf("%-8.2f ",dis);
}
printf("\n");
}
}

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