第七次实验
实验任务三:在屏幕上输出了分数从高到低的信息;同时也生成了file3.dat;文件里的信息正确且可读;
实验任务四:
子任务1:生成了;生成了file4.dat;里面的数据不是直观且可读
子任务2:
#include <stdio.h> #include <stdlib.h> #define N 10 typedef struct student { int num; char name[20]; int score; }STU; int main() { FILE *fin; STU st[N]; int i; fin = fopen("file4.dat", "r+"); if( !fin ) { printf("fail to open file4.dat\n"); exit(0); } for(i=0; i<N; i++) fread(&st[i],sizeof(struct student),1,fin); fclose(fin); for(i=0; i<N; i++) printf("%-6d%-10s%3d\n", st[i].num, st[i].name, st[i].score); return 0; }
实验任务五:
#include <stdio.h> #include <string.h> #include <stdlib.h> const int N = 10; typedef struct student { 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("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; } void input(STU s[], int n) { int i; FILE *fin; fin = fopen("examinee.txt", "r"); if( !fin ) { printf("fail to open examinee.txt\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); } void output(STU s[], int n) { int i,j; FILE *fin; fin = fopen("result.txt", "w"); if( !fin ) { printf("fail to open result.txt\n"); exit(0); } printf("准考证号 姓名 客观题得分 操作题得分 总分 等级\n"); for(i=0;i<n;i++) printf("%ld %15s %15f %15f %17f %-8s\n",s[i].id,s[i].name,s[i].objective,s[i].subjective,s[i].sum,s[i].level); for(j=0;j<n;j++) fprintf(fin,"%ld %s %f %f %f %s\n",s[j].id,s[j].name,s[j].objective,s[j].subjective,s[j].sum,s[j].level); } void process(STU s[], int n) { int i,j,x,z; STU transport; float N=10; for(i=0;i<n;i++) s[i].sum=s[i].objective+s[i].subjective; for(x=1;x<n;x++){ for(j=0;j<n-x;j++){ if(s[j].sum<s[j+1].sum){ transport=s[j]; s[j]=s[j+1]; s[j+1]=transport; } } } for(z=0;z<n;z++){ if(z<=N/10-1) strcpy(s[z].level,"优秀"); else if(z>N/10-1&&z<=N/2-1) strcpy(s[z].level,"合格"); else strcpy(s[z].level,"不合格"); } }