task1
#include <stdio.h> #define N 80 #define M 100 typedef struct { char name[N]; char author[N]; } Book; void func1(); void func2(); int main() { func1(); func2(); return 0; } void func1() { Book x[] = { {"《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 n, i; FILE *fp; n = sizeof(x) / sizeof(Book); fp = fopen("data1.txt", "w"); if(fp == NULL) { printf("fail to open file\n"); return; } for(i = 0; i < n; ++i) fprintf(fp, "%-20s %-20s\n", x[i].name, x[i].author); fclose(fp); } void func2() { Book x[M]; int i, n; FILE *fp; fp = fopen("data1.txt", "r"); if(fp == NULL) { printf("fail to open file\n"); return; } 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); }
task2.1
#include <stdio.h> #define N 80 #define M 7 typedef struct { char name[N]; char author[N]; } Book; void func1(); void func2(); int main() { func1(); func2(); return 0; } void func1() { Book x[M] = { {"《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 n, i; FILE *fp; fp = fopen("data2.dat", "wb"); if(fp == NULL) { printf("fail to open file\n"); return; } fwrite(x, sizeof(Book), M, fp); fclose(fp); } void func2() { Book x[M]; int i; FILE *fp; fp = fopen("data2.dat", "rb"); if(fp == NULL) { printf("fail to open file\n"); return; } fread(x, sizeof(Book), M, fp); for(i = 0; i < M; ++i) printf("%d. %-20s%-20s\n", i+1, x[i].name, x[i].author); fclose(fp); }
2.2
#include <stdio.h> #define N 80 #define M 7 typedef struct { char name[N]; char author[N]; } Book; void func1(); void func2(); int main() { func1(); func2(); return 0; } void func1() { Book x[M] = { {"《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 n, i; FILE *fp; fp = fopen("data2.dat", "wb"); if(fp == NULL) { printf("fail to open file\n"); return; } fwrite(x, sizeof(Book), M, fp); fclose(fp); } void func2() { Book x[N]; int i, cnt; FILE *fp; fp = fopen("data2.dat", "rb"); if(fp == NULL) { printf("fail to open file\n"); return; } i = 0; while(!feof(fp)) { fread(&x[i], sizeof(Book), 1, fp); i++; } cnt = i - 1; for(i = 0; i < cnt; ++i) printf("%d. %-20s%-20s\n", i+1, x[i].name, x[i].author); fclose(fp); }
task3
#include <stdio.h> #define N 5 #define M 80 void func1(); void func2(); void func3(); int main() { func1(); func2(); func3(); return 0; } void func1() { char *ptr[N] = { "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; } for(i = 0; i < N; ++i) { fputs(ptr[i], fp); fputs("\n", fp); } fclose(fp); } void func2() { char songs[N][M]; int i; FILE *fp; fp = fopen("data3.txt", "r"); if(fp == NULL) { printf("fail to open file\n"); return; } 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); } void func3() { char ch; FILE *fp; fp = fopen("data3.txt", "r"); if(fp == NULL) { printf("fail to open file\n"); return; } while(!feof(fp)) { ch = fgetc(fp); if(ch == EOF) break; putchar(ch); } fclose(fp); }
task 4
#include <stdio.h> int main() { FILE *fp; char ch; int count=0; fp=fopen("data4.txt","r"); if(fp == NULL) { printf("fail to open file\n"); return; } while((ch=fgetc(fp)) != EOF) { if(ch != ' ' && ch != '\n' && ch != '\t') count++; } fclose(fp); printf("data4.txt中共包含字符数(不计空白符):%d",count); return 0; }
task 5
#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; // 总分 char ans[10]; // 考试结果 } STU; // 函数声明 void finput(STU st[], int n); void foutput(STU st[], int n); void output(STU st[], int n); int process(STU st[], int n, STU st_pass[]); int main() { STU stu[N], stu_pass[N]; int cnt; double pass_rate; printf("从文件读入%d个考生信息...\n", N); finput(stu, N); printf("\n对考生成绩进行统计...\n"); cnt = process(stu, N, stu_pass); printf("\n通过考试的名单:\n"); output(stu_pass, cnt); // 输出到屏幕 foutput(stu_pass, cnt); // 输出到文件 pass_rate = 1.0 * cnt / N; printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100); return 0; } // 把通过考试的考生完整信息输出到屏幕上 // 准考证号,姓名,客观题得分,操作题得分,总分,结果 void output(STU st[], int n) { int i; 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结果\n"); for (i = 0; i < n; i++) printf("%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[i].ans); } // 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 finput(STU st[], 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", &st[i].id, st[i].name, &st[i].objective, &st[i].subjective); } fclose(fin); } // 把通过考试的考生完整信息写入文件list_pass.txt // 准考证号,姓名,客观题得分,操作题得分,总分,结果 void foutput(STU s[], int n) { FILE *fout; int i; // 保存到文件 fout = fopen("list_pass.txt", "w"); if (!fout) { printf("fail to open or create list_pass.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结果\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].ans); fclose(fout); } // 对考生信息进行处理:计算每位考生考试总分、结果;统计考试通过的人数 int process(STU st[], int n, STU st_pass[]) { int i,j=0; for(i=0;i<n;i++){ st[i].sum=st[i].subjective + st[i].objective; if(st[i].sum >= 60){ strcpy(st[i].ans,"pass"); st_pass[j++]=st[i]; } else strcpy(st[i].ans,"fail"); } return j; }
task 6
#include <stdio.h> #include <string.h> #include <stdlib.h> #include <time.h> #define M 100 #define N 80 typedef struct { long int id; char name[10]; char c[20]; }STU; int main(){ STU st[M]; int i,n; FILE *fin; FILE *fp; 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,"%ld %s %s",&st[i].id,st[i].name,st[i].c); } fp = fopen("lucky.txt", "wb"); if(fp == NULL) { printf("fail to open file\n"); return 1; } srand(time(0)); for(i=0;i<5;i++){ n=rand()%N; fprintf(fp,"%ld %-10s %-20s\n",st[n].id,st[n].name,st[n].c); printf("%ld %-10s %-20s\n",st[n].id,st[n].name,st[n].c); } fclose(fin); fclose(fp); return 0; }
标签:fp,return,int,void,st,实验,printf From: https://www.cnblogs.com/520y/p/18252339