#include<stdio.h>

#include<stdlib.h>

#include<string.h>

intmain()

{

inta,b,d,e,n,z;

floatc=0,g;

printf("Inputstudentnumber(n<30):\n");

scanf("%d",&n);

longv[n],f;

floatvc[n];

next:;

intx1=0,x2=0,x3=0,x4=0,x5=0,x6=0;

intz1=60,z2=69,z3=70,z4=79,z5=80,z6=89,z7=90,z8=99,z9=100;

printf("ManagementforStudents'scores\n"

"1.Inputrecord\n"

"2.Caculatetotalandaveragescoreofcourse\n"

"3.Sortindescendingorderbyscore\n"

"4.Sortinascendingorderbyscore\n"

"5.Sortinascendingorderbynumber\n"

"6.Searchbynumber\n"

"7.Statisticanalysis\n"

"8.Listrecord\n"

"0.Exit\n"

"PleaseInputyourchoice:\n");

scanf("%d",&a);

switch(a)

{

case1:

printf("Inputstudent'sIDandscore:\n");

for(b=0;b<n;b++)

{

scanf("%ld%f",&v[b],&vc[b]);

}

break;

case2:

for(b=0;b<n;b++)

{

c=c+vc[b];

}

printf("sum=%.0f,aver=%.2f\n",c,c/n);

break;

case3:

printf("Sortindescendingorderbyscore:\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;

case4:

printf("Sortinascendingorderbyscore:\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;

case5:

printf("Sortinascendingorderbynumber:\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;

case6:

printf("Inputthenumberyouwanttosearch:\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("Notfound!\n");

break;

case7:

for(b=0;b<n;b++)

{

if(vc[b]<60)

x1++;

elseif(vc[b]<70)

x2++;

elseif(vc[b]<80)

x3++;

elseif(vc[b]<90)

x4++;

elseif(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;

case8:

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++)