标签:fp int STU 实验 printf include fin
实验一
#include <stdio.h> #define N 5 #define M 80 typedef struct { char name[M]; //书名 char author[M];// 作者 }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,茨威格子"}, {"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"); // 如果打开文件失败,输出提示信息并返回 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; }
#include <stdio.h> #define N 5 #define M 80 typedef struct { char name[M]; //书名 char author[M];// 作者 }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; }
实验二
#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;}
#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; }
实验三
#include <stdio.h> int main() { FILE *fin, *fout; char ch; // 以只读、文本方式打开文件data3_1.txt fin = fopen("data3_1.txt", "r"); // 如果打开失败,输出提示信息并返回 if(fin == NULL) { printf("fail to open data3_1.txt\n"); return 1; } // 以写、文本方式打开文件data3_2.txt fout = fopen("data3_2.txt", "w"); // 如果打开失败,输出提示信息并返回 if(fout == NULL) { printf("fail to open data3_2.txt\n"); return 1; } // 当fin指向的文件data1_txt没有结束时 while( !feof(fin) ) { // 从fin指向的文件data1_txt读取单个字符 ch = fgetc(fin); // 如果ch是小写字母,转换成大写 if(ch >= 'a' && ch <= 'z') ch -= 32; // 将字符变量ch中的字符写入fout指向的文件data3_2.txt fputc(ch, fout); } fclose(fin); fclose(fout); return 0; }
#include<stdio.h> #include <stdlib.h> int main() { char ch; int num=0; FILE *fp; int i; if((fp=fopen("data3_1.txt","r"))==NULL) /* 打开一个文件*/ { printf("not open"); exit(0); } while ((ch=fgetc(fp))!=EOF) { if(ch>='a'&&ch<='z') num++; else if(ch>='A'&&ch<='Z') num++; else if(ch>='0'&&ch<='9') num++; else if(ch==' '||ch=='\n') num==num; else num++; } printf("data3_1.txt中共包含字符数:%d\n",num); fclose(fp); }
实验四
#include <stdio.h> #define N 5 typedef struct { long no; char name[20]; int score; } STU; int findMinlist(STU s[], int n, STU t[]); int main() { STU stu[N], minlist[N]; int count, i; FILE *fin, *fout; // 从文件中读取学生数据到结构体数组stu中,并在屏幕上打印输出 fin = fopen("data4_1.txt", "r"); if(fin == NULL) { printf("fail to open file\n"); return 1; } for(i=0; i<N; ++i) { fscanf(fin, "%ld %s %d", &stu[i].no, stu[i].name, &stu[i].score); printf("%ld %s %d\n", stu[i].no, stu[i].name, stu[i].score); } fclose(fin); // 查找最低分学生信息并统计最低分学生人数 count = findMinlist(stu, N, minlist); // 将最低分学生信息在屏幕上打印输出 printf("\n一共有%d个最低分,信息如下: \n", count); for(i=0; i<count; ++i) printf("%ld %s %d\n", minlist[i].no, minlist[i].name, minlist[i].score); // 将最低分学生信息写入文件data4_2.txt fout = fopen("data4_2.txt", "w"); if(fout == NULL) { printf("fail to open file\n"); return 1; } for(i=0; i<count; ++i) fprintf(fout, "%ld %s %d\n", minlist[i].no, minlist[i].name, minlist[i].score); fclose(fout); return 0; } int findMinlist(STU s[], int n, STU t[]) { int i, k, min_score; // 找最低分 min_score = s[0].score; for(i=1; i<n; ++i) if(s[i].score < min_score) min_score = s[i].score; // 统计最低分人数,把最低分学生信息保存到数组t k = 0; for(i=0; i<n; ++i) if(s[i].score == min_score) { t[k] = s[i]; ++k; } return k; }
实验五
#define _CRT_SECURE_NO_WARNINGS #include <stdio.h> #include <string.h> #include <stdlib.h> #define N 10 typedef struct { long int id; char name[20]; float objective; 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, a; STU t; for (i = 0; i < n; i++) s[i].sum = s[i].objective * 0.4 + s[i].subjective * 0.6; for (i = 0; i < n; i++) { for (j = 0; j < n; j++) { if (s[i].sum > s[j].sum) { t = s[j]; s[j] = s[i]; s[i] = t; } } } j = (int)(0.1 * n); a = (int)(0.5 * n); for (i = 0; i < n; i++) { if (i <j)strcpy(s[i].level, "优秀"); else if (a<= i <j)strcpy(s[i].level, "合格"); else strcpy(s[i].level, "不合格"); } }
实验6
#include <stdio.h> #include <string.h> #include <stdlib.h> #include <time.h> #define N 80 typedef struct { long int id; char name[20]; char classe[80]; }STU; void input(STU s[], int n); void srand_stu(STU s[], STU lucky_[], int num); void output(STU s[], int n); int main() { STU x[80]; STU lucky[5]; input(x, N); srand_stu(x, lucky, 5); output(lucky, 5); return 0; } void input(STU s[], int n) { int i; FILE *fin; fin = fopen("list.txt", "r"); if (fin ==0) { printf("fail to open file\n"); exit(0); } while (!feof(fin)) { for (i = 0; i < n; i++) fscanf(fin,"%ld %s %s", &s[i].id, s[i].name, s[i].classe); } fclose(fin); } void srand_stu(STU s[],STU lucky_[], int num) { int i,r; srand(time(0)); r = rand() % (79 - 0 + 1) + 1; for (i = 0;i < num;i++) { lucky_[i] = s[r]; r = rand() % (79 - 0 + 1) + 1; } } void output(STU s[], int n) { int i; FILE *fout; fout = fopen("lucky.txt", "w"); if (fout ==0) { printf("fail to open file\n"); exit(0); } for (i = 0; i < n; i++) { fprintf(fout, "%ld %s %s", s[i].id, s[i].name,s[i].classe); fprintf(fout,"\n"); printf("%ld %s %s", s[i].id, s[i].name, s[i].classe); printf("\n"); } fclose(fout); }
标签:fp,int,STU,实验,printf,include,fin 来源: https://www.cnblogs.com/wozhende6/p/16343803.html
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