1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
| #include<stdio.h>
#include<string.h>
#define maxn 1000
#define maxl 100
#define EPS 1e-5
int n;
char sid[maxn][maxl];
int cid[maxn];
char name[maxn][maxl];
int score[maxn][5];
int removed[maxn];
const char* course_name[]={"Chinese","Mathematics","English","Programming"};
int valid(int k)
{
for (int i=0;i<k;i++)
if(!removed[i])
if(!strcmp(sid[i],sid[k]))
return 0;
return 1;
}
void add()
{
while(1)
{
printf("Please enter the SID, CID, name and four scores. Enter 0 to finish.\n");
scanf("%s",sid[n]);
if(!strcmp(sid[n],"0"))
break;
scanf("%d%s%d%d%d%d",&cid[n],name[n],&score[n][0],&score[n][1],&score[n][2],&score[n][3]);
if(valid(n))
{
score[n][4]=score[n][0]+score[n][1]+score[n][2]+score[n][3];
n++;
}
else
printf("Duplicated SID.\n");
}
}
int rank(int k)
{
int r=0;
for(int i=0;i<n;i++)
if(!removed[i]&&score[i][4]>score[k][4])
r++;
return r+1;
}
void DQ (int isq)
{
char s[maxl];
while(1)
{
printf("Please enter SID or name. Enter 0 to finish.\n");
scanf("%s",s);
if(!strcmp (s, "0"))
break;
int r=0;
for(int i=0;i<n;i++)
if(!removed[i])
{
if(!strcmp(sid[i],s)||!strcmp(name[i],s))
{
if(isq)
printf("%d %s %d %s %d %d %d %d %d %.2f\n",rank(i),sid[i],cid[i],name[i],score[i][0],score[i][1],score[i][2],score[i][3],score[i][4],score[i][4]/4.0+EPS);
else
{
removed[i]=1;
r++;
}
}
}
if(!isq)
printf("%d student(s) removed.\n",r);
}
}
double get_course_stat(int c,int s,int* passed,int* failed)
{
int tot=0;
*passed=*failed=0;
for(int i=0;i<n;i++)
if(!removed[i]&&(!c||cid[i]==c))
{
tot+=score[i][s];
if(score[i][s]>=60)
(*passed)++;
else
(*failed)++;
}
return (double)tot/(double)(*passed+*failed);
}
void get_overall_stat(int c,int* cnt)
{
cnt[0]=cnt[1]=cnt[2]=cnt[3]=cnt[4]=0;
for(int i=0;i<n;i++)
if(!removed[i]&&(!c||cid[i]==c))
{
int k=0;
for(int j=0;j<4;j++)
if(score[i][j]>=60)
k++;
cnt[k]++;
}
}
void stat()
{
int c;
printf("Please enter class ID, 0 for the whole statistics.\n");
scanf("%d", &c);
for(int i=0;i<4;i++)
{
int passed,failed;
double avg=get_course_stat(c,i,&passed,&failed);
printf("%s\n",course_name[i]);
printf("Average Score: %.2f\n",avg+EPS);
printf("Number of passed students: %d\n",passed);
printf("Number of failed students: %d\n",failed);
printf("\n");
}
int cnt[5];
get_overall_stat(c,cnt);
printf("Overall:\n");
printf("Number of students who passed all subjects: %d\n",cnt[4]);
printf("Number of students who passed 3 or more subjects: %d\n",cnt[4]+cnt[3]);
printf("Number of students who passed 2 or more subjects: %d\n",cnt[4]+cnt[3]+cnt[2]);
printf("Number of students who passed 1 or more subjects: %d\n",cnt[4]+cnt[3]+cnt[2]+cnt[1]);
printf("Number of students who failed all subjects: %d\n",cnt[0]);
printf("\n");
}
int main()
{
while(1)
{
int choice;
printf("Welcome to Student Performance Management System (SPMS).\n");
printf("\n");
printf("1 - Add\n");
printf("2 - Remove\n");
printf("3 - Query\n");
printf("4 - Show ranking\n");
printf("5 - Show Statistics\n");
printf("0 - Exit\n");
printf("\n");
scanf("%d",&choice);
if(choice==0)
break;
if(choice==1)
add();
if(choice==2)
DQ(0);
if(choice==3)
DQ(1);
if(choice==4)
printf("Showing the ranklist hurts students' self-esteem. Don't do that.\n");
if(choice==5)
stat();
}
return 0;
}
|