1 #include <stdlib.h>

  2 #include <stdio.h>

  3 #include <string.h>

  4 #include <ctype.h>

  5

  6 #define NAME_MAX_LEN 20

  7 #define STUDENTS_MAX_NUMBER 100

  8

  9 typedef struct

 10 {

 11     int stuId;

 12     char name[NAME_MAX_LEN];

 13     int score;

 14     int flag;

 15     int age;

 16 } Student;

 17

 18 int add(Student stu, Student stus[])

 19 {

 20     for(int i=0; i<STUDENTS_MAX_NUMBER; i++)

 21     {

 22         if(stus[i].flag == 0)

 23         {

 24             // stus[i].name = stu.name; 刚开始这么写有问题，stus[i].name时字符串常量不能在=左边

 25             strcpy(stus[i].name,stu.name);

 26             stus[i].score = stu.score;

 27             stus[i].age = stu.age;

 28             stus[i].flag = 1;  // 当前学生属性设置完毕，改变状态

 29             return 0;

 30         }

 31     }

 32     return 1;

 33 }

 34

 35 int update(Student stu, Student stus[])

 36 {

 37     for(int i=0; i<STUDENTS_MAX_NUMBER; i++)

 38     {

 39         if(strcmp(stus[i].name,stu.name) == 0) // 之前直接用 == 判断，不报错，运用有bug，找了半天问题

 40         {

 41             stus[i].score = stu.score;

 42             return 0;

 43         }

 44     }

 45     return 1;

 46 }

 47

 48 int search(Student stu, Student stus[])

 49 {

 50     for(int i=0; i<STUDENTS_MAX_NUMBER; i++)

 51     {

 52         if(strcmp(stus[i].name,stu.name) ==0 && stus[i].flag == 1)

 53         {

 54             fprintf(stdout,"学号:%d 姓名:%s 分数:%d 年龄:%d\n",stus[i].stuId,stu.name,stu.score,stu.age);

 55             return 0;

 56         }

 57     }

 58     fprintf(stdout,"查无此人！\n");

 59     return 1;

 60 }

 61

 62 int delete(Student stu, Student stus[])

 63 {

 64     for(int i=0; i<STUDENTS_MAX_NUMBER; i++)

 65     {

 66         if(strcmp(stus[i].name,stu.name) == 0)

 67         {

 68             stus[i].flag = 0;

 69             return 0;

 70         }

 71     }

 72     fprintf(stdout,"该学生不存在！\n");

 73     return 1;

 74 }

 75

 76 int showlist(Student stus[])

 77 {

 78     fprintf(stdout,"**************************\n");

 79     fprintf(stdout,"学生名单\n");

 80     for(int i=0; i<STUDENTS_MAX_NUMBER; i++)

 81     {

 82         if(stus[i].flag == 1)

 83         {

 84             fprintf(stdout,"学号:%d 姓名:%s 分数:%d 年龄:%d\n",stus[i].stuId,stus[i].name,stus[i].score,stus[i].age);

 85         }

 86     }

 87     fprintf(stdout,"**************************\n");

 88     return 0;

 89 }

 90

 91 int main(void)

 92 {

 93     int option;

 94     int tag = 1;

 95     Student stu;

 96     Student stus[STUDENTS_MAX_NUMBER];  // 结构体数组

 97

 98     for(int i=0; i<STUDENTS_MAX_NUMBER; i++)  //所有学生id和状态初始化

 99     {

100         stus[i].stuId = i;

101         stus[i].flag = 0;

102     }

103

104     while(tag)

105     {

106         fprintf(stdout,"===========================\n");

107         fprintf(stdout,"欢迎进入学生管理系统\n\n");

108         fprintf(stdout,"1:添加\n\n");

109         fprintf(stdout,"2:修改分数\n\n");

110         fprintf(stdout,"3:学生个人信息查询\n\n");

111         fprintf(stdout,"4:删除\n\n");

112         fprintf(stdout,"5:显示学生名单\n\n");

113         fprintf(stdout,"0:退出系统\n\n");

114         fprintf(stdout,"===========================\n");

115         fprintf(stdout,"请输入选项:");

116

117         //option = getchar();

118         scanf("%d",&option);

119         switch(option)

120         {

121             case 1:

122                 fprintf(stdout,"请输入学生姓名:");

123                 scanf("%s",stu.name);

124                 fprintf(stdout,"请输入学生分数:");

125                 scanf("%d",&stu.score);

126                 fprintf(stdout,"请输入学生年龄:");

127                 scanf("%d",&stu.age);

128                 add(stu,stus);

129                 break;

130             case 2:

131                 fprintf(stdout,"请输入学生姓名:");

132                 scanf("%s",stu.name);

133                 fprintf(stdout,"请输入新的分数:");

134                 scanf("%d",&stu.score);

135                 update(stu,stus);

136                 break;

137             case 3:

138                 fprintf(stdout,"请输入要查询学生姓名:");

139                 scanf("%s",stu.name);

140                 search(stu,stus);

141                 break;

142             case 4:

143                 fprintf(stdout,"请输入要删除学生姓名:");

144                 scanf("%s",stu.name);

145                 delete(stu,stus); // 当前学生标记状态标记为0

146                 break;

147             case 5:

148                 showlist(stus);

149                 break;

150             case 0:

151                 tag = 0;

152                 break;

153             default:

154                 fprintf(stdout,"输入选项有误，请重新输入!\n\n");

155                 break;

156         }

157     }

158

159     exit(0);

160 }