C语言程序集.doc

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.hstruct student char num6;char name8;int score3;float avr; stu5;main()int i,j,sum;FILE *fp;/*input*/for(i=0;i5;i+) printf(n please input No. %d score:n,i);printf(stuNo:);scanf(%s,stui.num);printf(name:);scanf(%s,);sum=0;for(j=0;j3;j+) printf(score %d.,j+1);scanf(%d,&stui.scorej);sum+=stui.scorej;stui.avr=sum/3.0;fp=fopen(stud,w);for(i=0;i5;i+)if(fwrite(&stui,sizeof(struct student),1,fp)!=1)printf(file write errorn);fclose(fp);题目：有两个磁盘文件A和B,各存放一行字母，要求把这两个文件中的信息合并（按字母顺序排列），输出到一个新文件C中。1.程序分析：2.程序源代码：#include stdio.hmain() FILE *fp;int i,j,n,ni;char c160,t,ch;if(fp=fopen(A,r)=NULL)printf(file A cannot be openedn);exit(0);printf(n A contents are :n);for(i=0;(ch=fgetc(fp)!=EOF;i+)ci=ch;putchar(ci);fclose(fp);考试大全国最大教育类网站(wwwE)ni=i;if(fp=fopen(B,r)=NULL)printf(file B cannot be openedn);exit(0);printf(n B contents are :n);for(i=0;(ch=fgetc(fp)!=EOF;i+)ci=ch;putchar(ci);fclose(fp);n=i;for(i=0;in;i+)for(j=i+1;jcj)t=ci;ci=cj;cj=t;printf(n C file is:n);fp=fopen(C,w);for(i=0;i=a&strii)printf(please input a little smaller.n);scanf(%d,&guess);elseprintf(please input a little bigger.n);scanf(%d,&guess);end=clock();b=time(NULL);printf(1: It took you %6.3f secondsn,var=(double)(end-start)/18.2);printf(1: it took you %6.3f secondsnn,difftime(b,a);if(var15)printf(11 You are very clever! 11nn);else if(var25)printf(11 you are normal! 11nn);elseprintf(11 you are stupid! 11nn);printf(11 Congradulations 11nn);printf(The number you guess is %d,i);printf(ndo you want to try it again?(yy.or.n)n);if(c=getch()=y)goto loop;题目：时间函数举例31.程序分析：2.程序源代码：/*calculate time*/#include time.h#include stdio.hmain() clock_t start,end;int i;double var;start=clock();for(i=0;i10000;i+) printf(1111111111n);end=clock();printf(1: The different is %6.3fn,(double)(end-start);来源:考试大-计算机二级考试 题目：通讯录#include #include #include /* 定义保存通迅录的信息 */ struct friends char name20; /* 名字 */ char province20; /* 省份 */ char city20; /* 所在城市 */ char nation20; /* 民族 */ char sex2; /* 性别 M/F */ int age; /* 年龄 */ ; void getname (char search_name); int search (struct friends friend_list, char search_name); void print_result(struct friends friend_list, int index); int main (void) int index; char search_name20; struct friends friend_list4 = lihan, liaoning, huluodao,han,M,19, zhuqiang, jiangsu, changzhu, han,M,19, wangjiangang, liaoning, anshan,han,M,20, zhanghongwei, shandong, zhucheng, han,M,21, ; (void) getname (search_name); /* 获得用户输入 */ index = search (friend_list, search_name); /* 查询 */ (void) print_result (friend_list,index); /* 打印结果 */ return 0; /* * 函数名：getname * 功能：获得用户要查询的对象的名字 */ void getname (char search_name) printf (Pleace enter the name of your friends you want to search); scanf (%s, search_name); /* * 函数名：search * 功能：查询对象 */ int search (struct friends friend_list, char search_name) int i; /* 穷举通迅录 */ for (i = 0; i 4; +i) if (strcmp(friend_, search_name) = 0) return (i); if (i = 4) printf (I am sorry! there is nobody by the name you enter!n); fflush(stdin); getchar(); exit (0); /* * 函数名：print_result * 功能：打印结果 */ void print_result(struct friends friend_list, int index) printf (the imformation of %s:n, friend_); printf (-n); printf ( NAME: %-sn, friend_); printf (PROVINCE: %-sn, friend_vince); printf ( CITY: %-sn, friend_listindex.ci