#include<stdio.h> #define N 2 int main(){ char *x[N]={"0123456789-0123456789", "nuist2023 - nuist2024" }; int i; FILE *fp; fp=fopen("data4.txt","w"); if(fp==NULL){ printf("fail to open file\n"); return 1; } for(i=0;i<N;i++){ fputs(x[i],fp); fputs("\n",fp); } fclose(fp); return 0; }
#include<stdio.h> int main(){ char ch; int i=0; FILE *fp; fp=fopen("data4.txt","r"); if(fp==NULL){ printf("fail to open file\n"); return 1; } while(1){ ch=fgetc(fp); if(ch!=' '&&ch!='\n'&&ch!='\0'&&ch!=' '&&ch!=EOF){ i++; } if(ch==EOF){ break; } putchar(ch); } fclose(fp); printf("data4.txt中共包含字符数(不计空白符):%d",i); return 0; }
#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, N); // 输出到屏幕 foutput(stu, N); // 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,cnt=0; for(i=0;i<n;++i){ st[i].sum=st[i].objective+st[i].subjective; if(st[i].sum>=60){ strcpy(st[i].ans,"pass"); st_pass[cnt++]=st[i]; } else{ strcpy(st[i].ans,"fail"); } } return cnt; }
#include<stdlib.h> #include<time.h> #define N 20 #define M 80 #define K 5 typedef struct{ long int num; char name[N]; char cla[N]; }STU; void output(STU st[],int n); void foutput(STU st[],int n); void finput(STU st[],int n); void luck(STU st[],int n,STU stl[]); int main(){ STU list[M],lucky[M]; finput(list,M); luck(list,M,lucky); output(lucky,K); foutput(lucky,K); return 0; } void finput(STU st[],int n){ int i; FILE *fp; fp=fopen("list.txt","r"); if(fp==NULL){ printf("wrong"); exit(0); } while(!feof(fp)){ for(i=0;i<n;i++){ fscanf(fp,"%lld %s %s",&st[i].num,st[i].name,st[i].cla); } } fclose(fp); } void output(STU st[],int n){ int i; for(i=0;i<n;i++){ printf("%-10lld%-10s%-10s\n",st[i].num,st[i].name,st[i].cla); } } void foutput(STU st[],int n){ int i; FILE *fp; fp=fopen("lucky.txt","w"); for(i=0;i<n;i++){ fprintf(fp,"%-10lld%-10s%-10s",st[i].num,st[i].name,st[i].cla); fprintf(fp,"\n"); } fclose(fp); } void luck(STU st[],int n,STU stl[]){ int i,j,k; srand(time(NULL)); for(i=0,k=0;i<n;i++){ j=rand()%M; stl[k++]=st[j]; } }
#include<stdio.h> #include<stdlib.h> #include<string.h> #include<time.h> #define N 20 #define M 80 #define K 5 typedef struct{ long int num; char name[N]; char cla[N]; }STU; void output(STU st[],int n); void foutput(STU st[],int n); void finput(STU st[],int n); void luck(STU st[],int n,STU stl[]); void sort(STU st[],int n); int main(){ STU list[M],lucky[M]; finput(list,M); luck(list,M,lucky); sort(lucky,K); output(lucky,K); foutput(lucky,K); return 0; } void finput(STU st[],int n){ int i; FILE *fp; fp=fopen("list.txt","r"); if(fp==NULL){ printf("wrong\n"); exit(0); } while(!feof(fp)){ for(i=0;i<n;i++){ fscanf(fp,"%ld %s %s",&st[i].num,st[i].name,st[i].cla); } } fclose(fp); } void output(STU st[],int n){ int i; for(i=0;i<n;i++){ printf("%-10ld%-10s%-10s\n",st[i].num,st[i].name,st[i].cla); } } void foutput(STU st[],int n){ int i; FILE *fp; char date[20]={0}; time_t now; time(&now); strftime(date,sizeof(date),"%Y%m%d.txt",localtime(&now)); fp=fopen(date,"w"); for(i=0;i<n;i++){ fprintf(fp,"%-10ld%-10s%-10s",st[i].num,st[i].name,st[i].cla); fprintf(fp,"\n"); } fclose(fp); } void luck(STU st[],int n,STU stl[]){ int flag[M]={0}; int j,k; srand(time(NULL)); for(k=0;k<n;){ j=rand()%M; if(!flag[j]){ stl[k++]=st[j]; flag[j]=1; } } } void sort(STU st[],int n){ int i,j; STU t; for(i=0;i<n-1;i++){ for(j=0;j<n-1-i;j++){ if(st[j].num>st[j+1].num){ t=st[j]; st[j]=st[j+1]; st[j+1]=t; } } } }
标签:fp,int,void,st,STU,实验,printf From: https://www.cnblogs.com/u329089/p/17920160.html