#task4
#include <stdio.h> #include <stdlib.h> int main(void){ FILE *fp; char ch; int letter=0; if((fp=fopen("data4.txt","r"))==NULL) { printf("File open error!\n"); exit(0); } while((ch=fgetc(fp))!=EOF) { if(ch>='!'&&ch<='z') letter=letter+1; } printf("data4.txt中所包含的字符数(不包含空白符)%d\n",letter); return 0; }
#task5
#include <stdio.h> #include <string.h> #include <stdlib.h> #define N 10 typedef struct { long int id; char name[20]; float objective; float subjective; float sum; char level[10]; } STU; 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; } void input(STU s[], int n) { int i; FILE* fin; fin = fopen("D:/Seven/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); } void output(STU s[], int n) { FILE* fout; int i; 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); 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); } void process(STU s[], int n) { STU tmp; int i, j; for (i = 0; i < n; ++i) { s[i].sum =s[i].objective+s[i].subjective; } for (i = 0; i < n-1; ++i) { for (j = 0; j < n- i-1; ++j) { if (s[j].sum < s[j + 1].sum) { tmp = s[j]; s[j] = s[j + 1]; s[j + 1] = tmp; } } } 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"); } }
#task6
#include <stdio.h> #include <string.h> #include <stdlib.h> #include <time.h> #define N 80 typedef struct { int id; char name[20]; char classes[30]; } STU; void input(STU s[], int n); void output(STU s[], int n); void process(STU s[], STU t[], int n); int main() { STU stu[N], lucky[N]; int num; printf("从文件读入学生信息\n\n"); input(stu, N); srand(time(NULL)); while(1) { printf("请输入要抽取的学生人数:\n"); scanf("%d", &num); if(num == 0) break; process(stu, lucky, num); printf("\n抽取完毕,正在输出。\n\n"); output(lucky, num); } 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, "%d %s %s", &s[i].id, s[i].name, s[i].classes); } fclose(fin); } void output(STU s[], int n) { FILE *fout; int i; time_t timeseed; struct tm *now; char name[N] = {0}; time(×eed); now = localtime(×eed); strftime(name, N, "%Y.%m.%d %H-%M-%S.txt", now); printf("\n"); //printf("%s\n", name); printf("学号\t\t姓名\t\t班级\n"); for (i = 0; i < n; i++) printf("%d\t%s\t\t%s\n", s[i].id, s[i].name, s[i].classes); printf("\n"); fout = fopen(name, "w"); if (!fout) { printf("fail to open or create lucky.txt\n"); exit(0); } fprintf(fout, "学号\t\t姓名\t\t班级\n"); for (i = 0; i < n; i++) fprintf(fout, "%d\t%s\t\t%s\n", s[i].id, s[i].name, s[i].classes); fclose(fout); } void process(STU s[], STU t[], int n) { int i, k; STU *temp[N]; for(i = 0; i < N; i++) temp[i] = &s[i]; for( i = 0; i < n; ) { k = rand()%N; if(temp[k] != NULL) { t[i++] = s[k]; temp[k] = NULL; } } }
标签:name,int,void,STU,实验,printf,include From: https://www.cnblogs.com/chw666/p/17482603.html