C语言第四次实验代码.docx

第四次实验题（1）#includestdio.hint Days[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};struct Date{int year;int month;int day;};int isLeapYear(struct Date);int Dayth(struct Date);int Judge(struct Date);int main(){struct Date d;printf(year-month-day:);scanf(%d %d %d,d.year,d.month,d.day);if(Judge(d)){printf(%d年的第%d天\n,d.year,Dayth(d));}else{printf(Error input\n);}return 0;}int isLeapYear(struct Date d){if(((d.year%4==0)(d.year%100!=0))||(d.year%400==0))return 1;elsereturn 0;}int Dayth(struct Date d){int i,sum=0;if(isLeapYear(d))Days[2]=29;for(i=1;id.month;i++)sum+=Days[i];return sum+d.day;}int Judge(struct Date d){if(d.year=0)return 0;else{if(d.month12 || d.month1)return 0;else{switch(d.month){case 1:case 3:case 5:case 7:case 8:case 10:case 12:if(d.day31 || d.day1)return 0;break;case 4:case 6:case 9:case 11:if(d.day30 || d.day1)return 0;break;case 2:if(isLeapYear(d)){if(d.day29 || d.day1)return 0;}else{if(d.day28 || d.day1)return 0;}break;}}}return 1;}题（2）#includestdio.h#includestdlib.hint main(){FILE *fin,*fout;char ch;fin=fopen(D:\\f1.txt,r);if(fin==0){printf(file error\n);exit(1);}fout=fopen(D:\\f2.txt,w);if(fout==0){printf(file error\n);exit(1);}ch=fgetc(fin);while(!feof(fin)){putchar(ch);fprintf(fout,%c\t%d\n,ch,ch);ch=fgetc(fin);}fclose(fin);fclose(fout);return 0;}题（3）（本题较难，下图是运行界面）源代代码：#includestdio.h#includestdlib.h#includestring.h#define N 50struct Student {char ID[20];char name[30];int age;double score;};typedef struct Student Student;int Input_stu_Info(Student *stu){int n=0;char ID[20];char name[30];int age;double score;gets(ID);gets(name);scanf(%d%lf,age,score);while(ID[0]!=#){strcpy(stu[n].ID,ID);strcpy(stu[n].name,name);stu[n].age=age;stu[n].score=score;n++;getchar();gets(ID);gets(name);scanf(%d%lf,age,score);}return n;}void Save_Info(char *filename,Student *stu,int len){FILE *fout;fout=fopen(filename,wb);if(fout==0){printf(file error\n);exit(1);}fwrite(stu,sizeof(Student),len,fout);fclose(fout);}void ReadOut(char *filename){FILE *fin;Student st;fin=fopen(filenam