实验7
实验任务1
代码：
#include <stdlib.h> #include <stdio.h> #define N 7 #define M 80 typedef struct { char name[M]; char author[M]; }Book; int main() { Book x[N]={{"《雕塑家》","斯科特.麦克劳德"}, {"《灯塔》","克里斯多夫.夏布特"}, {"《五号屠宰场》","库尔特.冯内古特"}, {"《出卖月亮的人》","罗伯特.海因莱茵"}, {"《大地之上》","罗欣顿.米斯特里"}, {"《上学记》","何兆武"}, {"《命运》","蔡崇达"}}; 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; }
#include <stdlib.h> #include <stdio.h> #define N 7 #define M 80 typedef struct { char name[M]; char author[M]; }Book; int main() { Book x[N]; int i,n; FILE *fp; fp=fopen("data1.txt","r"); if(fp == NULL){ printf("fail to open file\n"); return 1; } i=0; while(!feof(fp)){ fscanf(fp,"%s%s",x[i].name,x[i].author); ++i; } n=i-1; for(i=0;i<n;++i) printf("%d.%-20s%-20s\n",i+1,x[i].name,x[i].author); fclose(fp); system("pause"); return 0; }
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实验任务2
代码：
#include <stdlib.h> #include <stdio.h> #define N 7 #define M 80 typedef struct { char name[M]; char author[M]; }Book; int main() { Book x[N] = { {"《雕塑家》", "斯科特.麦克劳德"}, {"《灯塔》", "克里斯多夫.夏布特"}, {"《五号屠宰场》", "库尔特.冯内古特"}, {"《出卖月亮的人》", "罗伯特.海因莱茵"}, {"《大地之上》", "罗欣顿·米斯特里"}, {"《上学记》", "何兆武"}, {"《命运》", "蔡崇达"} }; 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"); return 0; }
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实验任务3
代码：
#include <stdlib.h> #include <stdio.h> #define N 5 #define M 80 int main(){ char songs[N][M]={"Working's Blues", "Everything will flow", "Streets of london", "Perfect day", "Love story"}; int i; FILE *fp; fp=fopen("data3.txt","w"); if(fp==NULL){ printf("fail to open file\n"); return 1; } for(i=0;i<N;++i){ fputs(songs[i],fp); fputs("\n",fp); } fclose(fp); system("pause"); return 0; }
#include <stdlib.h> #include <stdio.h> #define N 5 #define M 80 int main(){ char songs[N][M]; int i; FILE *fp; fp=fopen("data3.txt","w"); if(fp==NULL){ printf("fail to open file\n"); return 1; } for(i=0;i<N;++i) fgets(songs[i],80,fp); for(i=0;i<N;++i) printf("%d.%s",i+1,songs[i]); fclose(fp); system("pause"); return 0; }
#include <stdlib.h> #include <stdio.h> #define N 5 #define M 80 int main(){ char ch; FILE *fp; fp = fopen("data3.txt", "r"); if(fp == NULL) { printf("fail to open file\n"); return 1; } ch = fgetc(fp); while(ch != EOF) { putchar(ch); ch = fgetc(fp); } fclose(fp); system("pause"); return 0; }
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实验任务4
代码：
#include <stdlib.h> #include <stdio.h> #include<string.h> #define N 5 #define M 80 int main(){ char ch[M]; int n=0; FILE*fp; fp=fopen("data4.txt","r"); while(!feof(fp)){ fscanf(fp,"%s",ch); n+=strlen(ch); } printf("data4.txt:%d",n); fclose(fp); system("pause"); return 0; }
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实验任务5
代码：
#include <stdio.h> #include <string.h> #include <stdlib.h> #define N 10 typedef struct { 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("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); 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 == 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); } // 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) { FILE *fout; int i; // 输出到屏幕 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); // 保存到文件 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); } // 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; 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) { STU t; t = s[j]; s[j] = s[j + 1]; s[j + 1] = t; } } } for(i = 0;i < n; i++) { if(i <= n * 0.1) strcpy(s[i].level, "优秀"); else if(i <= n * 0.5) strcpy(s[i].level, "合格"); else strcpy(s[i].level, "不合格"); } }
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实验任务6
代码：
#include <stdio.h> #include <stdlib.h> #include <ctime> const int N = 100; struct STU { int num; char name[10]; char banji[30]; } s[N], t[N]; void input(STU a[], int n) { int i; FILE *fin; fin = fopen("list.txt", "r"); if (fin == NULL) { printf("fail to open file\n"); exit(0); } while (!feof(fin)) { for (i = 0; i < n; i++) fscanf(fin, "%d %s %s", &a[i].num, a[i].name, a[i].banji); } fclose(fin); } void progress(STU a[], int n) { int i, x, j = 0; srand(time(0)); for(i = 1;i <= 5; i++) { x = rand() % n; t[j ++] = s[x]; } } void output(STU a[], int n) { int i; for(i = 0;i < n; i++) { printf("%d\t%s\t%s\n", a[i].num, a[i].name, a[i].banji); } FILE *fout; fout = fopen("result.txt", "w"); if(!fout) { printf("fail to open or create result.txt\n"); exit(0); } for(i = 0;i < n; i++) { fprintf(fout, "%d\t%s\t%s\n", a[i].num, a[i].name, a[i].banji); } fclose(fout); } int main() { int n = 80; input(s, n); progress(s, n); output(t, 5); return 0; }
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