任务4:
代码:
#include <stdio.h> int main() { int size=0; char sum; FILE *fp; fp = fopen("data4.txt", "r"); if(fp == NULL) { printf("fail to open file\n"); return 1; } sum=fgetc(fp); while(sum!=EOF){ if(sum!=' ') size++; sum=fgetc(fp); } printf("一个包含%d个字符\n",size-1); fclose(fp); return 0; }
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任务5:
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: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 a; for(i=0;i<n;i++) s[i].sum=s[i].objective+s[i].subjective; for (i = 1; i < n; i++){ for (j = n-1; j >= i; j--){ if (s[j].sum > s[j-1].sum){ a= s[j - 1]; s[j - 1] = s[j]; s[j] = a; } } } for(i=0;i<n;i++){ if(i==0) strcpy(s[i].level,"优秀"); else if(i<5) strcpy(s[i].level,"合格"); else strcpy(s[i].level,"不合格"); } }
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任务6:
代码:
#include <stdio.h> #include <stdlib.h> #define N 80 typedef struct { long int id; char name[20]; char cla[20]; } STU; int main() { STU s[N],stu[5]; int i; FILE *fin; fin = fopen("list.txt", "r"); if (fin == NULL) { printf("fail to open file\n"); return 1; } while (!feof(fin)) { for (i = 0; i < N; i++) fscanf(fin, "%ld %s %s", &s[i].id, s[i].name, s[i].cla); } fclose(fin); for (i = 0; i < 5; i++) stu[i]=s[rand()%20]; FILE *fout; printf("\n"); for (i = 0; i < 5; i++) printf("%ld\t%s\t%s\n", stu[i].id, stu[i].name, stu[i].cla); fout = fopen("lucky.txt", "w"); if (!fout) { printf("fail to open or create result.txt\n"); return 1;; } for (i = 0; i < 5; i++) fprintf(fout, "%ld\t%s\t%s\n", stu[i].id, stu[i].name, stu[i].cla); fclose(fout); return 0; }
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标签:STU,int,sum,stu,实验,printf,include From: https://www.cnblogs.com/FC000/p/17467208.html