第五次实验
作者:互联网
1. 实验任务1
task1_1.
#include <stdio.h> #define N 5 #define M 80 typedef struct { char name[M]; char author[M]; }Book; int main() { Book x[N] = { {"一九八四", "乔治.奥威尔"}, {"美丽新世界", "赫胥黎"}, {"昨日的世界", "斯蒂芬.茨威格"}, {"万历十五年", "黄仁宇"}, {"一只特立独行的猪", "王小波"} }; 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); return 0; }task1_2.
#include <stdio.h> #define N 5 #define M 80 typedef struct { char name[M]; char author[M]; }Book; int main() { Book x[N] ; int i; FILE *fp; fp = fopen("data1.txt", "r"); if(fp == NULL) { printf("fail to open file\n"); return 1; } for(i=0; i<N; ++i) { fscanf(fp, "%s %s\n", x[i].name, x[i].author); printf("%-20s %-20s\n", x[i].name, x[i].author); } fclose(fp); return 0; }x[i].name和x[i].author都是字符串,他们的地址就是本身。 2. 实验任务2
#include <stdio.h> #define N 5 #define M 80 typedef struct { char name[M]; char author[M]; }Book; int main() { Book x[N] = { {"一九八四", "乔治.奥威尔"}, {"美丽新世界", "赫胥黎"}, {"昨日的世界", "斯蒂芬.茨威格"}, {"万历十五年", "黄仁宇"}, {"一只特立独行的猪", "王小波"} }; 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); return 0; }
生成了文件,且文件直观可现。
task2_2.#include <stdio.h> #define N 5 #define M 80 typedef struct { char name[M]; char author[M]; }Book; int main() { Book x[N] ; int i; FILE *fp; fp = fopen("data2.dat", "rb"); if(fp == NULL) { printf("fail to open file\n"); return 1; } fread(x,sizeof(Book),N,fp); for(i=0;i<N;i++) printf("%-20s %-20s\n",x[i].name,x[i].author); fclose(fp); return 0; }3. 实验任务3
#include <stdio.h> int main() { FILE *fin; int i=0; char ch; fin = fopen("data3_1.txt", "r"); if(fin == NULL) { printf("fail to open data3_1.txt\n"); return 1; } while((ch=fgetc(fin))!=EOF) { if(ch!=' ' &&ch!='\n'&&ch!=' ') i=i+1; } printf("data3_1.txt中的字符数为%d",i); fclose(fin); return 0; }5. 实验任务5
#include <stdio.h> #include <string.h> #include <stdlib.h> #define N 10 typedef struct { 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("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; } 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); } void output(STU s[], int n) { FILE* fout; int i; 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); 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); } void process(STU s[], int n) { int i, j, k; STU temp; for(i=0;i<n;i++) { s[i].sum = s[i].objective + s[i].subjective; } 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; } for (i = 0;i <n/10;i++) strcpy(s[i].level, "优秀"); for(k=n/10;k<n/2;k++) strcpy(s[k].level, "合格"); for (int m = n/2;m < n ;m++) strcpy(s[m].level, "不合格"); }6. 实验任务6
#include <stdio.h> #include<stdlib.h> #define M 80 typedef struct { long int id; char name[20]; char cla[80]; }STU; int main() { STU x[80]; FILE *fin,*fout; fin=fopen("list.txt","r"); fout=fopen("lucky.txt","w"); int i,k,j,a,b=0; for(i=0;i<80;i++) { fscanf(fin,"%ld %s %s",&x[i].id,x[i].name,x[i].cla); } for(j=0;j<5;j++) { k=rand()%80; if(k==b) continue; b=k; for(i=0;i<80;i++) { a=x[i].id%100; if(k==a) { printf("%-20d %-20s %-20s\n",x[i].id,x[i].name,x[i].cla); fprintf(fout,"%ld %s %s\n",&x[i].id,x[i].name,x[i].cla); } } } fclose(fin); fclose(fout); return 0; }
标签:fp,int,char,第五次,Book,实验,include,define 来源: https://www.cnblogs.com/tk-1816/p/16343150.html