学生成绩管理系统V2.0

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
int a,b,d,e,n,z;
float c=0,g;
printf("Input student number(n<30):\n");
scanf("%d",&n);
long v[n],f;
float vc[n];
next:;
int x1=0,x2=0,x3=0,x4=0,x5=0,x6=0;
int z1=60,z2=69,z3=70,z4=79,z5=80,z6=89,z7=90,z8=99,z9=100;
printf("Management for Students' scores\n"
"1.Input record\n"
"2.Caculate total and average score of course\n"
"3.Sort in descending order by score\n"
"4.Sort in ascending order by score\n"
"5.Sort in ascending order by number\n"
"6.Search by number\n"
"7.Statistic analysis\n"
"8.List record\n"
"0.Exit\n"
"Please Input your choice:\n");
scanf("%d",&a);
switch (a)
{
case 1:
printf("Input student's ID and score:\n");
for (b=0;b<n;b++)
{
scanf("%ld%f",&v[b],&vc[b]);
}
break;
case 2:
for (b=0;b<n;b++)
{
c=c+vc[b];
}
printf("sum=%.0f,aver=%.2f\n",c,c/n);
break;
case 3:
printf("Sort in descending order by score:\n");
for (d=0;d<n;d++)
{
for (e=d+1;e<n;e++)
{
if (vc[d]<vc[e])
{
g=vc[d];
vc[d]=vc[e];
vc[e]=g;
g=v[d];
v[d]=v[e];
v[e]=g;
}
}
}
for (b=0;b<n;b++)
{
printf("%ld\t%.0f\n",v[b],vc[b]);
}
break;
case 4:
printf("Sort in ascending order by score:\n");
for (d=0;d<n;d++)
{
for (e=d+1;e<n;e++)
{
if (vc[d]>vc[e])
{
g=vc[d];
vc[d]=vc[e];
vc[e]=g;
g=v[d];
v[d]=v[e];
v[e]=g;
}
}
}
for (b=0;b<n;b++)
{
printf("%ld\t%.0f\n",v[b],vc[b]);
}
break;
case 5:
printf("Sort in ascending order by number:\n");
for (d=0;d<n;d++)
{
for (e=d+1;e<n;e++)
{
if (v[d]>v[e])
{
g=vc[d];
vc[d]=vc[e];
vc[e]=g;
g=v[d];
v[d]=v[e];
v[e]=g;
}
}
}
for (b=0;b<n;b++)
{
printf("%ld\t%.0f\n",v[b],vc[b]);
}
break;
case 6:
printf("Input the number you want to search:\n");
scanf("%ld",&f);
z=0;
for (b=0;b<n;b++)
{
if (v[b]==f)
{
printf("%ld\t%.0f\n",v[b],vc[b]);
z=1;
break;
}
}
if (z==0)
printf("Not found!\n");
break;
case 7:
for (b=0;b<n;b++)
{
if (vc[b]<60)
x1++;
else if (vc[b]<70)
x2++;
else if (vc[b]<80)
x3++;
else if (vc[b]<90)
x4++;
else if (vc[b]<100)
x5++;
else
x6++;
}
printf("<60\t%d\t%.2f%%\n",x1,(float)x1/n*100);
printf("%d-%d\t%d\t%.2f%%\n",z1,z2,x2,(float)x2/n*100);
printf("%d-%d\t%d\t%.2f%%\n",z3,z4,x3,(float)x3/n*100);
printf("%d-%d\t%d\t%.2f%%\n",z5,z6,x4,(float)x4/n*100);
printf("%d-%d\t%d\t%.2f%%\n",z7,z8,x5,(float)x5/n*100);
printf("%d\t%d\t%.2f%%\n",z9,x6,(float)x6/n*100);
break;
case 8:
for (d=0;d<n;d++)
{
for (e=d+1;e<n;e++)
{
if (v[d]>v[e])
{
g=vc[d];
vc[d]=vc[e];
vc[e]=g;
g=v[d];
v[d]=v[e];
v[e]=g;
}
}
}
for (b=0;b<n;b++)
{
printf("%ld\t%.0f\n",v[b],vc[b]);
}
break;
case 0:
printf("End of program!\n");
goto end;
default:
printf("Input error!\n");
}
goto next;
end:;
}。