#include <stdio.h>#include <string.h>#include <stdlib.h>int main(){ FILE *fp; fp=fopen("data4.txt","r"); char ch='a'; int i=0; do { ch=fgetc(fp); if(ch!=' '&&ch!='\n'&&ch!='\t') i++; }while(!feof(fp)); printf("%d",i-1); fclose(fp); return 0;} |

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#include <stdio.h>#include <string.h>#include <stdlib.h>#define N 10typedef 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; for(i=0;i<n;i++) s[i].sum=s[i].subjective+s[i].objective; int j; STU t; for(j=0;j<n-1;j++) for(i=0;i<n-1;i++) if(s[i].sum<s[i+1].sum) { t=s[i+1]; s[i+1]=s[i]; s[i]=t; } for(i=0;i<n;i++) if(1.0*i/10<=0.1) strcpy(s[i].level,"优秀"); else if(1.0*i/10<=0.5) strcpy(s[i].level,"合格"); else strcpy(s[i].level,"不合格"); } |


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#include <stdio.h>#include <string.h>#include <stdlib.h>#include <time.h>#define N 80typedef struct{long no;char name[40];char cla[40];}STU;int main(){ int i; FILE *fp; fp=fopen("list.txt","r"); if (fp == NULL) { printf("fail to open file\n"); exit(0); } STU s[80]; STU b[5]; while (!feof(fp)) { for (i = 0; i <N; i++) fscanf(fp, "%ld %s %s", &s[i].no, s[i].name,s[i].cla); } srand(time(0)); int a; for(int j=0;j<5;j++) { a=rand()%80; b[j]=s[a]; } for(int j=0;j<5;j++) printf("%-20ld%-20s%-20s\n",b[j].no,b[j].name,b[j].cla); fclose(fp); FILE *fin; fin=fopen("lucky.txt","w"); for(int j=0;j<5;j++) fprintf(fin,"%-20ld%-20s%-20s\n",b[j].no,b[j].name,b[j].cla); fclose(fin); return 0;} |

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