实验任务4
源代码
#include <stdio.h> #include <ctype.h> int main() { char ch; FILE *fp; int n=0; fp = fopen("data4.txt", "r"); if(fp == NULL) { printf("fail to open file\n"); return 1; } ch = fgetc(fp); while(ch != EOF) { if(!isspace(ch)){n++; } ch = fgetc(fp); } fclose(fp); printf("data4.txt中共包含的字符数:%d",n); return 0; }
实验任务5
源代码
#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 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 // 不仅输出到屏幕上,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 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(i=0;i<n;i++) { for(j=0;j<n-1-i;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"); else if(i>=n*0.1&&i<n*0.5) strcpy(s[i].level,"合格"); else strcpy(s[i].level,"不合格"); } }
实验任务6
源代码
#include <stdio.h> #include <string.h> #include <stdlib.h> #include <time.h> #define N 80 #define M 100 typedef struct { long int id; char name[20]; char banji[100]; } STU; // 函数声明 void input(STU s[], int n); void output(STU s[],int n); int main() { STU stu[N]; input(stu, N); printf("随机抽选:\n"); output(stu,5); return 0; } void input(STU s[], int n) { int i; FILE *fin; 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", &s[i].id, s[i].name, s[i].banji); } fclose(fin); } void output(STU s[], int n) { FILE *fout; STU t[5]; int i; int k; // 输出 printf("\n"); srand((unsigned)time(NULL)); for (i = 0; i < n; i++){ int k=(rand()%80); t[i]=s[k]; printf("%ld\t\t%s\t%s\n", s[k].id, s[k].name, s[k].banji); } // 保存 fout = fopen("lucky.txt", "w"); if (!fout) { printf("fail to open or create lucky.txt\n"); exit(0); } for (i = 0; i < n; i++) fprintf(fout, "%ld\t\t%s\t%s\n", t[i].id, t[i].name, t[i].banji); fclose(fout); }
标签:int,void,STU,实验,printf,include,fin From: https://www.cnblogs.com/juhuajing/p/17479942.html