#include <stdio.h> #include <stdlib.h> #define N 5 #define M 80 typedef struct { char name[M]; char author[M]; }Book; int main() { Book x[N] = { {"一九八四", "乔治.奥威尔"}, {"美丽新世界", "赫胥黎"}, {"昨日的世界", "斯蒂芬.茨威格"}, {"万历十五年", "黄仁宇"}, {"一只特立独行的猪", "王小波"}}; int i; FILE *fp; fp = fopen("data1.txt", "w"); if(fp == NULL) { printf("fail to open file\n"); return 1; } for(i=0; i<N; ++i) { fprintf(fp, "%-20s %-20s\n", x[i].name, x[i].author); printf("%-20s %-20s\n", x[i].name, x[i].author); } fclose(fp); system("pause"); return 0; }
task1-2
#include <stdio.h> #include <stdlib.h> #define N 5 #define M 80 typedef struct { char name[M]; char author[M]; }Book; int main() { Book x[N]; int i; FILE*fp; fp=fopen("data1.txt","r"); if(fp==NULL) { printf("fail to open file\n"); return 1; } for(i=0;i<N;i++) { fscanf(fp,"%s %s\n",x[i].name,x[i].author); printf("%s %s\n",x[i].name,x[i].author); } fclose(fp); system("pause"); }
x[i].name本身就代表的是地址啊，所以不需要加取地址符
task2-1
#include <stdio.h> #include <stdlib.h> #define N 5 #define M 80 typedef struct { char name[M]; char author[M]; }Book; int main() { Book x[N]={{"一九八四","乔治~奥威尔"}, {"美丽新世界","赫胥黎"}, {"昨日的世界","斯蒂芬~茨威格"}, {"万历十五年","黄仁宇"}, {"一只特立独行的猫","王小波"} }; int i; FILE*fp; fp=fopen("data2.dat","wb"); if(fp==NULL) { printf("fail to open file\n"); return 1; } fwrite(x,sizeof(Book),N,fp); fclose(fp); system("pause"); }
确实生成了一个data2.dat
用word打开可见
task2-2
#include <stdio.h> #include <stdlib.h> #define N 5 #define M 80 typedef struct { char name[M]; char author[M]; }Book; int main() { Book x[N]; int i; FILE*fp; fp=fopen("data2.dat","rb"); if(fp==NULL) { printf("fail to open file\n"); return 1; } fread(x,sizeof(Book),N,fp); for(i=0;i<N;i++) { printf("%-20s %-20s\n",x[i].name,x[i].author); } fclose(fp); system("pause"); }
task3-2
#include <stdlib.h> #include <stdio.h> int main() { FILE *fin; char ch; long count=0; fin=fopen("data3_1.txt","r"); if(fin==NULL) { printf("fail to open data3_1.txt\n"); return 1; } while((ch=fgetc(fin))!=EOF) { if(ch!=' '&&ch!=' '&&ch!='\n') count++;} printf("%d",count); fclose(fin); system("pause"); }
task 5
#include <stdio.h> #include <string.h> #include <stdlib.h> #define N 10 typedef struct { long int id; char name[20]; float objective; float subjective; float sum; char level[10]; } STU; void input(STU s[], int n); void output(STU s[], int n); void process(STU s[], int n); int main() { STU stu[N]; printf("从文件读入%d个考生信息: 准考证号，姓名，客观题得分(<=40)，操作题得分(<=60)\n", N); input(stu, N); printf("\n对考生信息进行处理: 计算总分，确定等级\n"); process(stu, N); printf("\n打印考生完整信息, 并保存到文件中"); output(stu, N); system("pause"); return 0; } void input(STU s[], int n) { int i; FILE *fin; fin = fopen("examinee.txt", "r"); if (fin == NULL) { printf("fail to open file\n"); exit(0); } while (!feof(fin)) { for (i = 0; i < n; i++) fscanf(fin, "%ld %s %f %f", &s[i].id, s[i].name,&s[i].objective, &s[i].subjective);} fclose(fin); } void output(STU s[], int n) { FILE *fout; int i; printf("\n"); printf("准考证号\t姓名\t客观题得分\t操作题得分\t总分\t\t等级\n"); for (i = 0; i < n; i++) printf("%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", s[i].id,s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].level); fout = fopen("result.txt", "w"); if (!fout) { printf("fail to open or create result.txt\n"); exit(0); } fprintf(fout, "准考证号\t\t姓名\t客观题得分\t操作题得分\t总分\t\t等级\n"); for (i = 0; i < n; i++) fprintf(fout, "%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", s[i].id,s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].level); fclose(fout); } void process(STU s[], int n) { int i,j,t; for(i=0;i<n;i++) { s[i].sum=(s[i].objective)+(s[i].subjective); } for(j=0;j<n;j++) { for(i=0;i<n-j;i++) { if(s[i].sum<s[i+1].sum) { t=s[i+1].sum; s[i+1].sum=s[i].sum; s[i].sum=t;} } } for(i=0;i<1;i++) { strcpy( s[i].level,"优秀");} for(;i>=1&&i<5;i++) strcpy(s[i].level,"合格"); for(;i<n;i++) strcpy(s[i].level,"不合格"); }
task 6
#include<stdio.h> #include<time.h> #include<stdlib.h> #define N 80 struct student { char xuehao[11]; char name[10]; char grade[20]; }; int main() { struct student std[N]; int i,t; FILE *fp,*fout; srand(time(0)); fp=fopen("list.txt","r"); if(fp==NULL) { printf("fail to open\n"); exit(0); } fout=fopen("lucky.txt","w+"); if(fout==NULL) { printf("fail to creat\n"); exit(0); } for(i=0;i<N;i++) fscanf(fp,"%s %s %s",std[i].xuehao,std[i].name,std[i].grade); for(i=0;i<5;i++) { t=rand()%80; printf("%-20s %-20s %-20s\n",std[t].xuehao,std[t].name,std[t].grade); fprintf(fout,"%-20s %-20s %-20s\n",std[t].xuehao,std[t].name,std[t].grade); } fclose(fp); fclose(fout); system("pause"); }
