task4
#include <stdio.h> #include <stdlib.h> int main(){ int i=0; FILE *fp; char ch; fp=fopen("data4.txt","r"); if(fp==NULL){ printf("fail to open\n"); return i; } ch=fgetc(fp); while(!feof(fp)){ ch=fgetc(fp); if(ch!=' '&&ch!='\n'){ i++; } } fclose(fp); printf("data4.txt共包含字符数(不计空白字符):%d",i); 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; 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; STU t; for(i=0;i<n;i++){ s[i].sum=s[i].objective+s[i].subjective; for(j=0;j<n-1;j++){ if(s[j].sum<s[j+1].sum){ t=s[j]; s[j]=s[j+1]; s[j+1]=t; } } } for(i=0;i<n;i++){ if(i<n*0.1){ strcpy(s[i].level,"优秀"); } if(i<n*0.5&&i>=n*0.1){ strcpy(s[i].level,"合格"); } if(i>=n*0.5&&i<n){ strcpy(s[i].level,"不合格"); } } }
task6
#include <stdio.h> #include<stdlib.h> #include<time.h> int main(){ FILE *fp; char s[100][100]; int i, list[5],j,k; fp=fopen("list.txt","r"); if(fp==NULL){ printf("Cannot open file\n"); exit(0); } for(i=0;i<80;i++){ fgets(s[i],80,fp); } fclose(fp); srand(time(NULL)); fp=fopen("lucky.txt","w"); for(i=0;i<5;i++){ k=int(rand()%(80+1)); list[i]=k; } for(i=0;i<5;i++){ printf("%s",s[list[i]]); fprintf(fp,"%s",s[list[i]]); } fclose(fp); return 0; }
标签:fp,ch,int,char,STU,实验,include From: https://www.cnblogs.com/ghytf/p/17469308.html