// 将图书信息写入文本文件data1.txt #define _CRT_SECURE_NO_WARNINGS #include <stdio.h> #define N 7 #define M 80 typedef struct { char name[M]; // 书名 char author[M]; // 作者 } 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; // 以写的方式打开文本文件data1.txt 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; } // 将结构体数组x中的图书信息写到fp指向的文件data1.txt // 同时也输出到屏幕上 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; }
// 从文本文件data1.txt中读取图书信息,并打印输出到屏幕 #define _CRT_SECURE_NO_WARNINGS #include <stdio.h> #define N 10 #define M 80 typedef struct { char name[M]; // 书名 char author[M]; // 作者 } Book; int main() { Book x[N]; int i, n; FILE* fp; // 以读的方式打开文本文件data1.txt fp = fopen("data1.txt", "r"); // 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; } // 从文件中读取图书信息,保存到结构体数组x中 i = 0; while (!feof(fp)) { fscanf(fp, "%s%s", x[i].name, x[i].author); ++i; } n = i -1; // 将图书信息打印输出到屏幕上 for (i = 0; i < n; ++i) printf("%d. %-20s%-20s\n", i + 1, x[i].name, x[i].author); fclose(fp); return 0; }
// 将图书信息写入二进制文件data2.dat #define _CRT_SECURE_NO_WARNINGS #include <stdio.h> #define N 7 #define M 80 typedef struct { char name[M]; // 书名 char author[M]; // 作者 } 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; // 以写的方式打开二进制文件data2.dat fp = fopen("data2.dat", "wb"); // 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; } // 将结构体数组x中的图书信息以数据块方式写入文件data2.dat fwrite(x, sizeof(Book), N, fp); fclose(fp); return 0; }
// 从二进制文件data2.dat读取图书信息,并打印输出到屏幕 #define _CRT_SECURE_NO_WARNINGS #include <stdio.h> #define N 7 #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; // 以读的方式打开二进制文件data2.dat fp = fopen("data2.dat", "rb"); // 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; } // 从文件data2.dat以数据块方式读入图书信息数据到结构体数组x fread(x, sizeof(Book), N, fp); // 在屏幕上输出结构体数组x中存储的图书信息 for (i = 0; i < N; ++i) printf("%d. %-20s%-20s\n", i + 1, x[i].name, x[i].author); fclose(fp); return 0; }
// 使用fputs()将字符串写入文本文件 #define _CRT_SECURE_NO_WARNINGS #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", "Philadelphia" }; 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); return 0; }
// 使用fgets()从文件中读取字符串并在屏幕上显示 #define _CRT_SECURE_NO_WARNINGS #include <stdio.h> #define N 5 #define M 80 int main() { char songs[N][M]; int i; FILE* fp; fp = fopen("data3.txt", "r"); 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); return 0; }
#define _CRT_SECURE_NO_WARNINGS #include <stdio.h> 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); return 0; }
#define _CRT_SECURE_NO_WARNINGS #include <stdio.h> 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); int k = 0; while (ch != EOF) { k++; ch = fgetc(fp); } fclose(fp); printf("data4.txt中共包含字符数(不计空白格):%d", k); return 0; }
#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; // 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) { // 补足代码 // ××× STU t[N]; for (int i = 0; i < n; i++) { s[i].sum = s[i].objective + s[i].subjective; } for (int i = 0; i < n; i++) for (int j = 0; j < n - i; j++) { if (s[j].sum < s[j + 1].sum) { t[j] = s[j]; s[j] = s[j + 1]; s[j + 1] = t[j]; } } for (int i = 0; i <= (int)N*0.1; i++) strcpy(s[i].level, "优秀"); for (int i = (int)N*0.1+1; i <= (int)N*0.4; i++) strcpy(s[i].level, "合格"); for (int i = (int)N * 0.4+1; i <= N; i++) strcpy(s[i].level, "不合格"); }
#define _CRT_SECURE_NO_WARNINGS #include <stdio.h> #include<stdlib.h> #include<string.h> #include<time.h> int main() { FILE* fp; struct STU { long no; char name[80]; char class[80]; }; struct STU t[80] = {0}; fp = fopen("list.txt", "r"); if (fp == NULL) { printf("fail to open file\n"); exit(0); } int i = 0; while (!feof(fp)) { fscanf(fp, "%ld%s%s",&t[i].no, t[i].name, t[i].class); ++i; } fclose(fp); FILE* fg; time_t rawtime; struct tm* info; char buffer[80]; time(&rawtime); info = localtime(&rawtime); strftime(buffer, 80, "%Y-%m-%d.txt", info); fg = fopen(buffer, "w"); struct STU a[5]; srand(time(NULL)); for (int j = 0; j < 5; j++) { int i = rand()% 80 ; a[j] = t[i]; } /*for (i = 1; i < 5; i++) { for (m = 0; m < i; m++) { if (a[m].no == a[i].no) {a[i] = t[rand() % 80]; i--; } } }*/ for(int i=0,j=4;i!=j;i++,j--) if (a[j].no == a[i].no) { a[i] = t[i]; i = 0; j = 4; } for (int i = 0; i < 5; i++) { fprintf(fg, "%ld %s %s\n", a[i].no, a[i].name, a[i].class); printf("%ld %s %s\n", a[i].no, a[i].name, a[i].class); } fclose(fg); }
标签:fp,return,int,char,实验,printf,define From: https://www.cnblogs.com/tfbw/p/17003033.html