第十三次作业

一、找出最长的字符串

#include "stdio.h"
#include "string.h"
int main()
{
    int i;
    char sx[5],smax[5];
    printf("输入五个字符串:");
    for(i=0;i<5;i++){    
        scanf("%s",sx);
        if(strlen(sx)>strlen(smax)){ 
            strcpy(smax,sx);
        }
    }
    printf("max is %s
",smax);
    
    return 0;
}

二、分类统计字符个数

#include <stdio.h>
#include <string.h>
int main()
{
    char sc[80];
    int LETTER,letter,blank,digit,other,i;
    LETTER=letter=0;
    digit=blank=other=0;
    printf("输入一行文字：");
    gets(sc);
    i=0;
    while(sc[i]!=''){
        if('A'<=sc[i]&&'Z'>=sc[i])
            LETTER++;
        else if(sc[i]>='a'&&sc[i]<='z')
            letter++;
        else if(sc[i]>='0'&&sc[i]<='9')
            digit++;
        else if(sc[i]==' ')
            blank++;
        else
            other++;
        i++;
    }
    printf("LETTER=%d,letter=%d,digit=%d,blank=%d,other=%d
",LETTER,letter,digit,blank,other);
    
    return 0;
}

三、学生信息管理系统

#include "stdio.h"
#include "string.h"
struct students_list{
    int xuehao;
    char name[10];
    float chengji1,chengji2,chengji3;
    float ave;
};
int Count=0;
void new_student(struct students_list students[],int n);
void print_student(struct students_list students[]);
void search_student(struct students_list students[],char *name);
void average_student(struct students_list students[],char *name);

int main()
{
    int choice,n;
    char name[10];
    struct students_list students[50];
    do{
        printf("******学生信息管理系统******
");
        printf("	1:输入学生基本信息
");
        printf("	2:输出学生基本信息
");
        printf("	3:计算学生平均成绩
");
        printf("	4:查找学生基本信息
");
        printf("	0:退出
");
        printf("请选择功能:");
        scanf("%d",&choice);
        switch(choice){
            case 1:
                printf("请输入学生个数:");
                scanf("%d",&n);
                new_student(students,n);
                break;
            case 2:
                print_student(students);
                break;
            case 3:
                printf("请输入要查找的学生姓名:"); 
                scanf("%s",name);
                average_student(students,name);
                break;
            case 4:
                printf("请输入要查找的学生姓名:"); 
                scanf("%s",name);
                search_student(students,name);
                break;
            case 0:
                break;
        }
    }while(choice!=0);
    printf("谢谢使用学生信息管理系统！
");
    
    return 0;
}

void new_student(struct students_list students[],int n)
{
    int i;
    if(Count>50){
        printf("系统已满！
");
        return;
    }
    printf("请输入%d个学生的学号、姓名、成绩1、成绩2、成绩3
",n);
    for(i=Count;i<Count+n;i++){
        scanf("%d%s%f%f%f",&students[i].xuehao,students[i].name,&students[i].chengji1,&students[i].chengji2,&students[i].chengji3);
    }
    Count=Count+n;
}

void print_student(struct students_list students[])
{
    printf("学生信息系统中的学生为：
");
    int i;
    for(i=0;i<Count;i++){
        printf("%d %s %.2f %.2f %.2f
",students[i].xuehao,students[i].name,students[i].chengji1,students[i].chengji2,students[i].chengji3);
    }
}

void average_student(struct students_list students[],char *name)
{
    int i;
    if(Count==0){
        printf("该系统无学生！
");
        return;
    }
    printf("学生的平均成绩为:");
    for(i=0;i<Count;i++){
        students[i].ave=(students[i].chengji1+students[i].chengji2+students[i].chengji3)/3.0;
        printf("第%d个学生的平均成绩为%.2f
",i+1,students[i].ave);
    }
}

void search_student(struct students_list students[],char *name)
{
    int i,flag=0;
    if(Count==0){
        printf("查无此人！
");
        return;
    }
    for(i=0;i<Count;i++){
        if(strcmp(name,students[i].name)==0){
            flag=1;
            break;
        }
    }
        if(flag){
            printf("姓名:%s	",students[i].name);
            printf("学号:%d	",students[i].xuehao);
            printf("成绩:%.2f	",students[i].chengji1);
            printf("成绩:%.2f	",students[i].chengji2);
            printf("成绩:%.2f	",students[i].chengji3);
        }
        else
            printf("查无此人！
");
    
}

四、冒泡排序法

#include <stdio.h> 
void sort(int a[80],int n)
{
    int i,j,t;
    for(i=0;i<n;i++){
        for(j=i+1;j<n;j++){
            if(a[i]>a[j]){
                t=a[i];
                a[i]=a[j];
                a[j]=t;
            }
        }
    }
}
int main()
{
    int a[80],n,i;
    printf("输入一个整数n:");
    scanf("%d",&n);
    printf("输入%d个数:",n);
    for(i=0;i<n;i++){
        scanf("%d",&a[i]);
    }
    sort(a,n);
    for(i=0;i<n;i++){
        printf("%d	",a[i]);
    }
    
    return 0;
}

五、报数游戏

#include<stdio.h>
void CountOff(int n,int m,int out[])
{
    int i,a[80],j=0,k=0;
    for(i=0;i<n;i++){
        a[i]=i+1;
    }
    while(k<n){
        for(i=0;i<n;i++){ 
            if(a[i]!=0){
                j++;
                if(j==m){
                    out[k]=a[i];
                    j=0;
                    k++;
                }
            }
        }    
    }
}
int main()
{
    int i,x,y,Out[80];
    printf("输入总人数n:");
    scanf("%d",&x);
    printf("输入退出次位m(m<n):");
    scanf("%d",&y);
    CountOff(x,y,Out);
    printf("退出的顺序编号:");
    for(i=0;i<x;i++){
         printf("%3d",Out[i]);
    }
    printf("
");
    
    return 0;
}