#include<stdio.h> #include<stdlib.h> # define N 10 typedef struct student{ int num; char name[20]; int score; }STU; int main() { FILE *fp; STU st[N]; int i=0; fp=fopen("file4.dat","r"); if(fp==NULL){ printf("Failed to open filea\n"); exit(0); } for(i=0;i<N;i++) { if(fread(&st[i],sizeof(struct student),1,fp) == 1) { printf("%d %s %d\n", st[i].num, st[i].name, st[i].score); } } fclose(fp); return 0; }
运行结果:
#include <stdio.h> #include <stdlib.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); system("pause"); 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) { // 补足代码 // ××× FILE *fp; int i; if((fp=fopen("examinee.txt","r"))==NULL) { printf("cannot open file"); exit(0); } for(i=0;i<n;i++){ if(fscanf(fp,"%ld %s %f %f",&s[i].id,s[i].name,&s[i].objective,&s[i].subjective)==0) printf("error!"); } 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,还写到文本文件result.txt中 void output(STU s[], int n) { // 补足代码 // ××× FILE *fp; int i; if((fp=fopen("result.txt","w"))==NULL) { printf("cannot open file"); exit(0); } for(i=0;i<n;i++) { printf("%23d %8s %9.2f %9.2f %8.2f %7s\n",s[i].id,s[i].name,s[i].objective,s[i].subjective,s[i].sum,s[i].level); fprintf(fp,"%23d %8s %9.2f %9.2f %8.2f %7s\n",s[i].id,s[i].name,s[i].objective,s[i].subjective,s[i].sum,s[i].level); } fclose(fp); } // 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) { // 补足代码 // ××× int i,j; STU temp; for(i=0;i<n;i++) s[i].sum=s[i].objective*0.4+s[i].subjective*0.6; for(i=0;i<n-1;i++) for(j=0;j<n-1;j++) if(s[j].sum<s[j+1].sum){ temp=s[j]; s[j]=s[j+1]; s[j+1]=temp; } for(i=0;i<=n*0.1;i++) strcpy(s[0].level,"优秀"); for(i=n*0.1;i<=n*0.5;i++) strcpy(s[i].level,"合格"); for(i=n*0.5;i<n;i++) strcpy(s[i].level,"不合格"); }
运行结果:
#include <stdio.h> #include <stdlib.h> #include <time.h> #define N 80 int main(){ FILE *fp,*fout; int i,lucky[5],j; char stuinfo[N][80]; fp=fopen("list.txt","r"); if(fp==NULL){ printf("fail to open file"); exit(0); }; fout=fopen("lucky.txt","w"); if(fout==NULL){ printf("fail to open file"); exit(0); }; for(i=0;i<N;i++) fgets(stuinfo[i],80,fp);//读取 srand(time(NULL));//随机种子 for(i=0;i<5;i++){ lucky[i]=rand()%N;//随机数 for(j=0;j<i;j++){ if(lucky[j]==lucky[i])//避免重复 lucky[i]=rand()%N; } puts(stuinfo[lucky[i]]); fputs(stuinfo[lucky[i]],fout); } fclose(fp); fclose(fout); return 0; }
运行结果:
原文:https://www.cnblogs.com/chris2001/p/12113026.html