利用Hash技术统计C源程序中关键字

#include "stdio.h" main() { FILE *fp; int i,j,n,ni; char c[160],t,ch; if((fp=fopen("A","r"))==NULL) {printf("file A cannot be opened\n"); exit(0);} printf("\n A contents are :\n"); for(i=0;(ch=fgetc(fp))!=EOF;i++) {c[i]=ch; putchar(c[i]); } fclose(fp); ni=i; if((fp=fopen("B","r"))==NULL) {printf("file B cannot be opened\n"); exit(0);} printf("\n B contents are :\n"); for(i=0;(ch=fgetc(fp))!=EOF;i++) {c[i]=ch; putchar(c[i]); } fclose(fp); n=i; for(i=0;i<n;i++) for(j=i+1;j<n;j++) if(c[i]>c[j]) {t=c[i];c[i]=c[j];c[j]=t;} printf("\n C file is:\n"); fp=fopen("C","w"); for(i=0;i<n;i++) { putc(c[i],fp); putchar(c[i]); } fclose(fp); } ============================================================== 【程序100】 题目:有五个学生,每个学生有3门课的成绩,从键盘输入以上数据(包括学生号,姓名,三门课成绩),计算出 平均成绩,况原有的数据和计算出的平均分数存放在磁盘文件"stud"中. 1.程序分析: 2.程序源代码: #include "stdio.h" struct student { char num[6]; char name[8]; int score[3]; float avr; } stu[5]; main() {int i,j,sum; FILE *fp; /*input*/ for(i=0;i<5;i++) { printf("\n please input No. %d score:\n",i); printf("stuNo:"); scanf("%s",stu[i].num); printf("name:"); scanf("%s",stu[i].name); sum=0; for(j=0;j<3;j++) { printf("score %d.",j+1); scanf("%d",&stu[i].score[j]); sum+=stu[i].score[j]; } stu[i].avr=sum/3.0; } fp=fopen("stud","w"); for(i=0;i<5;i++) if(fwrite(&stu[i],sizeof(struct student),1,fp)!=1) printf("file write error\n"); fclose(fp); }