实验7 文件
#include <stdio.h> #include <stdlib.h> #define N 10 typedef struct student { int num; char name[20]; int score; }STU; int main() { STU st[N]; int k; FILE*hp; hp=fopen("file4.dat","rb"); if(hp==NULL) { printf ("fail to open file4.dat\n"); exit(0); } for(k=0;k<N;k++) { fread(&st[k],sizeof(STU),N,hp); printf("%-6d%-10s%3d\n", st[k].num, st[k].name, st[k].score); } fclose(hp); return 0; }
#include <stdio.h> #include <string.h> const int N = 10; // 定义结构体类型struct student,并定义其别名为STU typedef struct student { long int id; char name[20]; float objective; /*客观题得分*/ float subjective; /*操作题得分*/ float sum; char level[10]; }STU; // 函数声明 void input(STU s[], int n); void output(STU s[], int n); void process(STU s[], int n); int main() { STU stu[N]; printf("录入%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: 准考证号,姓名,客观题得分,操作题得分,总分,等级\n"); output(stu, N); return 0; } //从文本文件examinee.txt读入考生信息:准考证号,姓名,客观题得分,操作题得分 void input(STU s[], int n) { int i; FILE*fp; fp=fopen("examinee.txt","r"); if(!fp){ printf("fail to open examinee.txt\n"); } for(i=0;i<N;i++){ fscanf(fp,"%ld %s %f %f",&s[i].id,s[i].name,&s[i].objective,&s[i].subjective); } fclose(fp); } //输出考生完整信息: 准考证号,姓名,客观题得分,操作题得分,总分,等级 //不仅输出到屏幕上,还写在文本文件result.txt中 void output(STU s[], int n) { int i; FILE*fout; fout=fopen("result.txt","w"); if(!fout){ printf("fail to open result.txt\n"); } for(i=0;i<N;i++){ printf("%22ld %9s %8.1f %10.1f %9.1f %5s\n",s[i].id,s[i].name,s[i].objective,s[i].subjective,s[i].sum,s[i].level); fprintf(fout,"%22ld %9s %8.1f %10.1f %9.1f %5s\n",s[i].id,s[i].name,s[i].objective,s[i].subjective,s[i].sum,s[i].level); } fclose(fout); } // 对考生信息进行处理:计算总分,排序,确定等级 void process(STU s[], int n) { int i,j; STU temp; for(i=0;i<n;i++){ s[i].sum=s[i].objective+s[i].subjective; for(i=0;i<n;++i){ if(s[i].sum>95) strcpy(s[i].level,"优秀"); else if(s[i].sum>90&&s[i].sum<=95) strcpy(s[i].level,"合格"); else strcpy(s[i].level,"不合格"); } } for(i=0;i<n-1;i++) for(j=0;j<n-1-i;j++) if(s[j].sum<s[j+1].sum) { temp = s[j]; s[j] = s[j+1]; s[j+1] = temp; } }