step2 . day7 C语言阶段小的项目总结

1.终于再一次实现了上大学时候的课堂大作业，C语言算是进入可以应用的阶段了

2.写这段代码使用了模块编程的思想，也尝试的用了结构体指针、共用体指针和枚举类型学的传参，解决了全局变量声明及初始化和传参的问题，虽然成功了，但是感觉代码上还是有些资源浪费，

下一阶段除了总结Linux的基本命令应用，就要开始加强数据结构的知识梳理，贴上代码，做个阶段记录

1.定义头文件，用来实现调用函数声明及变量声明

#ifndef __HEAD_H__
#define __HEAD_H__
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#define N 50
struct student{
int id;
char name[32];
int age;
char sex[10];
float height;
};
union ustudent{
int id;
char name[32];
int age;
char sex[10];
float height;
};
enum select{
id,
name,
age,
sex,
height
};
void print(void);//打印选择List
void printhead();
void print1(struct student *,int);//打印１位同学信息
int myindex(struct student *);//寻找插入位置
void add(struct student *);//插入学生信息
void printAll(struct student *);//打印所有同学信息
void printName(struct student *);//打印所有同学名字
void selectbyname(struct student *);
void printselect(struct student *,union ustudent,enum select);
void selectbyage(struct student *);
void selectbysex(struct student *);
void selectbyheight(struct student *); //4个选择函数
void del(struct student *);//删除

#endif

2.头文件实现的.c文件（没写注释，这不是个好习惯）

#include"head.h"

union ustudent st;
enum select s;
void print(void){
printf(" ******************************************************8** ");
printf("please select a menu: ");
printf(" 1.Add a student. ");
printf(" 2.List all student name. ");
printf(" 3.List all informationes of students. ");
printf(" 4.Select a student by name. ");
printf(" 5.Select students by age. ");
printf(" 6.Select students by sex. ");
printf(" 7.Select students by height. ");
printf(" 8.Delete a student. ");
printf(" 9.Exit. ");
printf("please select a menu:");
}

int myindex(struct student *stu){
int i=0;
for(i=0;i<N;i++){
if(strlen(stu[i].name) ==0)
break;
}

return i;
}

void add(struct student *stu){

int n = myindex(stu);

if(n == (N-1))
{
printf("内存已满，添加失败！ ");
return;
}

else{

printf("please input ID:");
scanf("%d",&(stu[n].id));
printf("please input Name:");
scanf("%s",stu[n].name);
printf("please input Age:");
scanf("%d",&(stu[n].age));
printf("please input sex(1.male,2.Female):");
scanf("%s",stu[n].sex);
printf("please input height:");
scanf("%f",&(stu[n].height));

printf("add successful! ");
}

printhead();
print1(stu,n);
}
void printhead(){

printf(" ID Name Age Sex Height ");
}
void print1(struct student *stu,int n){

printf(" %d %s %d %s %.2f ",stu[n].id,stu[n].name,stu[n].age,stu[n].sex,stu[n].height);
}
void printAll(struct student *stu){

int i;
int n = myindex(stu);
printhead();
for(i=0;i<n;i++){
printf(" %d %s %d %s %.2f ",stu[i].id,stu[i].name,stu[i].age,stu[i].sex,stu[i].height);
}
}
void printName(struct student *stu){

int i;
int n = myindex(stu);
printf(" Name: ");
for(i=0;i<n;i++){
printf(" %s ",stu[i].name);
}
}

void selectbyname(struct student *stu){
printf("please input name:");
scanf("%s",st.name);
s = name;
printselect(stu,st,s);
}

void selectbyage(struct student *stu){
printf("please input age:");
scanf("%d",&st.age);
s = age;
printselect(stu,st,s);
}
void selectbysex(struct student *stu){
printf("please input sex:");
scanf("%s",st.sex);
s = sex;
printselect(stu,st,s);
}
void selectbyheight(struct student *stu){
printf("please input height:");
scanf("%f",&st.height);
s = height;
printselect(stu,st,s);
}
void printselect(struct student *stu,union ustudent st,enum select s){

int i;
int n = myindex(stu);
switch(s){
case name:
printhead();
for(i=0;i<n;i++){
if(strcmp(stu[i].name,st.name));
else
print1(stu,i);
}
break;

case sex:
printhead();
for(i=0;i<n;i++){
if(strcmp(stu[i].sex,st.sex));
else
print1(stu,i);
}
break;
case age:
printhead();
for(i=0;i<n;i++){
if(stu[i].age==st.age)
print1(stu,i);

else;
}
break;
case height:
printhead();
for(i=0;i<n;i++){
if((int)stu[i].height == (int)st.height)
print1(stu,i);
else ;
}
break;
case id:
printhead();
for(i=0;i<n;i++){
if(stu[i].id==st.id)
print1(stu,i);
else ;
}
break;
}
}
void del(struct student *stu){

printf("please input student ID:");
scanf("%d",&st.id);
s = id;
printselect(stu,st,s);
char chose;

printf("insure del(y/n):");
getchar();
chose = getchar();
/* if(chose == 'y'){
stu[st.id-1].id = 0;
memset(stu[st.id-1].name,0,32);
stu[st.id-1].age = 0;
memset(stu[st.id-1].sex,0,10);
stu[st.id-1].height = 0;
}
*/
int i;
if(chose == 'y'){
for(i =(st.id-1);i<50;i++)
stu[i] = stu[i+1];
}
else
return;
printAll(stu);

}

3.main函数

#include"head.h"

struct student stu[N];

int main(int argc, const char *argv[])
{
int choice;
do
{
print();
scanf("%d",&choice);
switch(choice){
case 1:add(stu);continue;
case 2:printName(stu);continue;
case 3:printAll(stu);continue;
case 4:selectbyname(stu);continue;
case 5:selectbyage(stu);continue;
case 6:selectbysex(stu);continue;
case 7:selectbyheight(stu);continue;
case 8:del(stu);continue;
case 9:printf(" studetManage APP closeed ");return 0;
default:
printf("choice error,please input again");
continue;
}
}while(1);

return 0;
}

4Makefile工程文件，这个最简单。。。

studentManage:main.o head.o
gcc main.o head.o -o studentManage
main.o:main.c
gcc -c main.c -o main.o
head.o:head.c
gcc -c head.c -o head.o

.PHONY:clean

clean:
rm *.o studentManage

写这个功能过程中，遇到了很多bug，在逐步调试的过程中也看到自己的知识薄弱点，所幸调试出来了，也算大有长进，享受这种多屏操作，满屏跑代码的快感