实验七
实验任务三:
是
实验任务四:
子任务二:
#include <stdio.h> #include <stdlib.h> #define N 10 typedef struct student { int num; char name[20]; int score; }STU; int main(){ FILE *fp; int i; STU st[N]; fp=fopen("file4.dat","rb"); if(!fp){ printf("fail to open\n"); exit(0); } for(i=0;i<N;i++){ fread(&st[i], sizeof(STU), 1, fp); printf("%-6d%-10s%3d\n", st[i].num, st[i].name, st[i].score); } fclose(fp); return 0; }
实验任务五:
#include <stdio.h> #include <string.h> #include<stdlib.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 *fin; fin = fopen("examinee.txt", "r"); if( !fin ) { printf("fail to open \n"); exit(0); } 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); } // 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,还写到文本文件result.txt中 void output(STU s[], int n) { int i; FILE *fout; fout = fopen("result.txt", "w"); if( !fout ) { printf("fail to open \n"); exit(0); } for(i=0;i<n;i++) fprintf(fout,"%5ld %6s %6.2f %6.2f %6.2f %6s\n",s[i].id,s[i].name,s[i].objective,s[i].subjective,s[i].sum,s[i].level); for(i=0;i<n;i++) printf("%5ld %6s %6.2f %6.2f %6.2f %6s\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,a,b; STU t; a=0.1*n; b=0.5*n; for(i=0;i<n;i++){ s[i].sum=s[i].objective+s[i].subjective; } for(i=0;i<n;i++){ for(j=0;j<n-i-1;j++){ if(s[j].sum<s[j+1].sum){ t=s[j]; s[j]=s[j+1]; s[j+1]=t; } } } for(i=0;i<n;i++){ if(i<a) strcpy(s[i].level,"优秀"); else if(i>=a&&i<=b) strcpy(s[i].level,"合格"); else strcpy(s[i].level,"不合格"); } }