1、.#include #include #include int main()int a,b,d,e,n,z;float c=0,g;printf(Input student number(n30):n);scanf(%d,&n);long vn,f;float vcn;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 scoresn1.Input recordn2.Caculate t

2、otal and average score of coursen3.Sort in descending order by scoren4.Sort in ascending order by scoren5.Sort in ascending order by numbern6.Search by numbern7.Statistic analysisn8.List recordn0.ExitnPlease Input your choice:n);scanf(%d,&a);switch (a)case 1:printf(Input students ID and score:n);for

3、 (b=0;bn;b+)scanf(%ld%f,&vb,&vcb);break;case 2:for (b=0;bn;b+)c=c+vcb;printf(sum=%.0f,aver=%.2fn,c,c/n);break;.case 3:printf(Sort in descending order by score:n);for (d=0;dn;d+)for (e=d+1;en;e+)if (vcdvce)g=vcd;vcd=vce;vce=g;g=vd;vd=ve;ve=g;for (b=0;bn;b+)printf(%ldt%.0fn,vb,vcb);break;case 4:printf

4、(Sort in ascending order by score:n);for (d=0;dn;d+)for (e=d+1;evce)g=vcd;vcd=vce;vce=g;g=vd;vd=ve;ve=g;for (b=0;bn;b+)printf(%ldt%.0fn,vb,vcb);break;.case 5:printf(Sort in ascending order by number:n);for (d=0;dn;d+)for (e=d+1;eve)g=vcd;vcd=vce;vce=g;g=vd;vd=ve;ve=g;for (b=0;bn;b+)printf(%ldt%.0fn,

5、vb,vcb);break;case 6:printf(Input the number you want to search:n);scanf(%ld,&f);z=0;for (b=0;bn;b+)if (vb=f)printf(%ldt%.0fn,vb,vcb);z=1;break;if (z=0)printf(Not found!n);break;case 7:for (b=0;bn;b+)if (vcb60);.x1+;else if (vcb70)x2+;else if (vcb80)x3+;else if (vcb90)x4+;else if (vcb100)x5+;elsex6+

6、;printf(60t%dt%.2f%n,x1,(float)x1/n*100);printf(%d-%dt%dt%.2f%n,z1,z2,x2,(float)x2/n*100);printf(%d-%dt%dt%.2f%n,z3,z4,x3,(float)x3/n*100);printf(%d-%dt%dt%.2f%n,z5,z6,x4,(float)x4/n*100);printf(%d-%dt%dt%.2f%n,z7,z8,x5,(float)x5/n*100);printf(%dt%dt%.2f%n,z9,x6,(float)x6/n*100);break;case 8:for (d=0;dn;d+)for (e=d+1;eve)g=vcd;vcd=vce;vce=g;g=vd;vd=ve;ve=g;for (b=0;bn;b+)printf(%ldt%.0fn,vb,v