#include<stdio.h>//include<stdlib.h>//include<string.h>intmain()(inta,b,d,e,n,z；floatc=0,g;printff'lnputstudentnumber(n<30):\n");scanf("%d",&n);longv[n],f;floatvc[n];next:;intxl=0,x2=0,x3=0,x4=01x5=01x6=0;intzl=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""O.ExitXn""PleaseInputyourchoice:\n");scanf("%d",&a);switch(a)(printff'lnputstudent'sIDandscore:\n");for(b=0;b<n;b++)(scanf(',%ld%f",&v[b].&vc[b]);)break;for(b=0;b<n;b++)(c=c+vc[b];)printf("sum=%.0f1aver=%.2f\n",c,c/n);break;printf("Sortindescendingorderbyscore:\n");for(d=0;d<n;d++)(for(e=d+l;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%.Of\n",v[b],vc[b]);)break;printff'Sortinascendingorderbyscore:\n");for(d=0;d<n;d++)(for(e=d+l;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%.Of\n",v[b],vc[b]);)break;printf("Sortinascendingorderbynumber:\n");for(d=0;d<n;d++)(for(e=d+l;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%.OAn",v[b],vc[b]);)break;printf("lnputthenumberyouwanttosearch:\n");scanf("%ld",&f)；z=0;for(b=0;b<n;b++){if(v[b]==f)(printf("%ld\t%,Of\n",v[b],vc[b]);z=l;break;))if(z==0)printff'Notfound!\n");break;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++;elsex6++;)printf("<60\t%d\t%,2f%%\n",xl,(float)xl/n*100);printf("%d-%d\t%d\t%.2m\n",zl,z2,x2,(float)x2/n*100);printf("%d-%d\t%d\t%.2M\n",z3,z4,x3,(float)x3/n*100);printf("%d-%d\t%d\t%.2m\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+l;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%.Of