步骤1
int main()
{
    char controll;
    char arr1[] = { "                              1.Input" };
    char arr2[] = { "                              2.Output" };
    char arr3[] = { "                              3.Order" };
    char arr4[] = { "                              4.Quit" };
    char arr5[] = { "You are trying to Input info" };
    char arr6[] = { "You are trying to Output info" };
    char arr7[] = { "You are trying to Make things ordered" };
    char arr8[] = { "You are about to Quit" };
    printf("%s\n%s\n%s\n%s\n", arr1, arr2, arr3, arr4);
    scanf_s("%c", &controll);
    switch (controll) {
    case 'i':printf("\n%s\n", arr5); break;
    case 'o':printf("\n%s\n", arr6); break;
    case 'm':printf("\n%s\n", arr7); break;
    case 'q':printf("\n%s\n", arr8); break;
        default:printf("Wrong input");
    }
   
}
步骤2
#include <iostream>

int main()
{
	struct student
	{
		int number;
		float gaoshu;
		float dawu;
		float yy;
		float add;
	}student1, student2, student3;
	scanf("%d",&student1.number);
scanf("%f",&student1.gaoshu);
scanf("%f",&student1.dawu);
scanf("%f",&student1.yy);
scanf("%d",&student2.number);
scanf("%f",&student2.gaoshu);
scanf("%f",&student2.dawu);
scanf("%f",&student2.yy);
scanf("%d",&student3.number);
scanf("%f",&student3.gaoshu);
scanf("%f",&student3.dawu);
scanf("%f",&student3.yy);
	student1.add = (student1.gaoshu + student1.dawu + student1.yy);
	student2.add = (student2.gaoshu + student2.dawu + student2.yy);
	student3.add = (student3.gaoshu + student3.dawu + student3.yy);
	printf("%d  %f  %f  %f  %f\n", student1.number, student1.gaoshu, student1.dawu, student1.yy, student1.add);

printf("%d  %f  %f  %f  %f\n", student2.number, student2.gaoshu, student2.dawu, student2.yy, student2.add);

printf("%d  %f  %f  %f  %f\n", student3.number, student3.gaoshu, student3.dawu, student3.yy, student3.add);
}
步骤3
int main()
{
    char controll;
    char arr1[] = { "                              1.Input" };
    char arr2[] = { "                              2.Output" };
    char arr3[] = { "                              3.Order" };
    char arr4[] = { "                              4.Quit" };
    char arr5[] = { "Please input info of the three students:" };
    char arr7[] = { "You are trying to Make things ordered" };
    char arr8[] = { "You are about to Quit" };
    printf("%s\n%s\n%s\n%s\n", arr1, arr2, arr3, arr4);
    scanf_s("%c", &controll);
    switch (controll) {
    case 'i':printf("\n%s\n", arr5); break;
    case 'm':printf("\n%s\n", arr7); break;
    case 'q':printf("\n%s\n", arr8); break;
    default:printf("Wrong input");
    }
            struct student
            {
                int number;
                float gaoshu;
                float dawu;
                float yy;
                float add;
                float aver;
            }student1, student2, student3,studenttemp;
scanf("%d",&student1.number);
scanf("%f",&student1.gaoshu);
scanf("%f",&student1.dawu);
scanf("%f",&student1.yy);
scanf("%d",&student2.number);
scanf("%f",&student2.gaoshu);
scanf("%f",&student2.dawu);
scanf("%f",&student2.yy);
scanf("%d",&student3.number);
scanf("%f",&student3.gaoshu);
scanf("%f",&student3.dawu);
scanf("%f",&student3.yy);
            student1.add = (student1.gaoshu + student1.dawu + student1.yy);
            student2.add = (student2.gaoshu + student2.dawu + student2.yy);
            student3.add = (student3.gaoshu + student3.dawu + student3.yy);
            student1.aver = student1.add / 3;
            student2.aver = student2.add / 3;
            student3.aver = student3.add / 3;
            if (student1.add > student2.add) {
                studenttemp = student1;
                student1 = student2;
                student2 = studenttemp;
         }
            if (student1.add > student3.add) {
                studenttemp = student1;
                student1 = student3;
                student3 = studenttemp;
            }
            if (student2.add > student3.add) {
                studenttemp = student2;
                student2 = student3;
                student3 = studenttemp;
            }
            printf("%d,%.1f,%.1f\n", student1.number, student1.add, student1.aver);
            printf("%d,%.1f,%.1f\n", student2.number, student2.add, student2.aver);
            printf("%d,%.1f,%.1f\n", student3.number, student3.add, student3.aver);
    
   
}
步骤四
#include <stdio.h>
int num[4],cla[4];
float f[4],s[4],t[4],add[4];
int begin,sta;
int n=4;
int insert;
void sort(float add[])
{
	int i,j,te;
	float zh;
	for(i=n-1;i>sta;i--)
	{
		if(add[i]>add[i-1])
		{
			zh=add[i];add[i]=add[i-1];add[i-1]=zh;
			te=num[i];num[i]=num[i-1];num[i-1]=te;
			zh=f[i];f[i]=f[i-1];f[i-1]=zh;
			zh=s[i];s[i]=s[i-1];s[i-1]=zh;
			zh=t[i];t[i]=t[i-1];t[i-1]=zh;
		}
	}
	if(n!=sta+1)
	 {
	sta++; 
	sort(add);}
}

void div(int clas[])
{
	int i,j,te;
	float zh;
	for(i=0;i<n-1;i++)
	{
		if(clas[i]>clas[i+1])
		{
			te=clas[i];clas[i]=clas[i+1];clas[i+1]=te;
			zh=add[i];add[i]=add[i+1];add[i+1]=zh;
			te=num[i];num[i]=num[i+1];num[i+1]=te;
			zh=f[i];f[i]=f[i+1];f[i+1]=zh;
			zh=s[i];s[i]=s[i+1];s[i+1]=zh;
			zh=t[i];t[i]=t[i+1];t[i+1]=zh;
		}
	}
	if(n!=sta+1){
		n--;
	div(clas);}

}
 
int main()
{
void sort(float add[]);
void div(int clas[]);
num[0]=10001;num[1]=10002;num[2]=10003;
cla[0]=11;cla[1]=12;cla[2]=11;
f[0]=99.5;f[1]=77.9;f[2]=92.5;
s[0]=88.5;s[1]=56.5;s[2]=99.0;
t[0]=89.5;t[1]=87.5;t[2]=60.5;
for(int i=0;i<3;i++)
{
	add[i]=f[i]+s[i]+t[i];	
}
scanf("%d",&num[3]);
insert=num[3];
int in=num[3];
for(int i=0;i<3;i++){
	if(in==num[i]){
		printf("%d %d %f %f %f %f",num[i],cla[i],f[i],s[i],t[i],add[i]);
		return 0;
	}
}
scanf("%d",&cla[3]);
scanf("%f",&f[3]);
scanf("%f",&s[3]);
scanf("%f",&t[3]);
add[3]=f[3]+s[3]+t[3];
sta=0;begin=0;
div(cla);
n=4;
int m;
for(m=0;m<n;m++){
	if(cla[m]!=cla[m+1])
		break;
}
sta=m;begin=sta;
sort(add);
n=m+1;
sta=0;begin=sta;
sort(add);
n=4;
for(int j=0;j<n;j++){
	printf("%d %d %f %f %f %f",num[j],cla[j],f[j],s[j],t[j],add[j]);
	if(num[j]==insert) printf(" insert\n");
	else printf("\n");
}

 } 
 步骤五
 #include <stdio.h>
#include <string.h>
#include <stdlib.h>
int num[4],cla[4];
float f[4],s[4],t[4],add[4];
int begin,sta;
int n=3;
int insert;
char name[4][10]={{"Zhang"},{"Yang"},{"Liang"}};
void sort(float add[])
{
	int i,j,te;
	float zh;
	char oo[10];
	for(i=n-1;i>sta;i--)
	{
		if(add[i]>add[i-1])
		{
			zh=add[i];add[i]=add[i-1];add[i-1]=zh;
			te=num[i];num[i]=num[i-1];num[i-1]=te;
			zh=f[i];f[i]=f[i-1];f[i-1]=zh;
			zh=s[i];s[i]=s[i-1];s[i-1]=zh;
			zh=t[i];t[i]=t[i-1];t[i-1]=zh;
			strcpy(oo,name[i]);strcpy(name[i],name[i-1]);
			strcpy(name[i-1],oo); 
		}
	}
	if(n!=sta+1)
	 {
	sta++; 
	sort(add);}
}

void div(int clas[])
{
	int i,j,te;
	float zh;
	char oo[10];
	for(i=0;i<n-1;i++)
	{
		if(clas[i]>clas[i+1])
		{
			te=clas[i];clas[i]=clas[i+1];clas[i+1]=te;
			zh=add[i];add[i]=add[i+1];add[i+1]=zh;
			te=num[i];num[i]=num[i+1];num[i+1]=te;
			zh=f[i];f[i]=f[i+1];f[i+1]=zh;
			zh=s[i];s[i]=s[i+1];s[i+1]=zh;
			zh=t[i];t[i]=t[i+1];t[i+1]=zh;
			strcpy(oo,name[i]);strcpy(name[i],name[i+1]);
			strcpy(name[i+1],oo); 
		}
	}
	if(n!=sta+1){
		n--;
	div(clas);}

}
 

int main()
{
void sort(float add[]);
void div(int clas[]);
num[0]=10001;num[1]=10002;num[2]=10003;
cla[0]=11;cla[1]=12;cla[2]=11;
f[0]=99.5;f[1]=77.9;f[2]=92.5;
s[0]=88.5;s[1]=56.5;s[2]=99.0;
t[0]=89.5;t[1]=87.5;t[2]=60.5;
sta=0;begin=0;
div(cla);
n=3;
int m;
for(m=0;m<n;m++){
	if(cla[m]!=cla[m+1])
		break;
}
sta=m;begin=sta;
sort(add);
n=m+1;
sta=0;begin=sta;
sort(add);
n=3;
	scanf("delete");
	scanf("%s",name[3]);
	int exist=0,target;
	if(name[3][0]>='0'&&name[3][0]<='9') 
	{
		int number=atoi(name[3]);
		for(int i=0;i<3;i++){
			if(number==num[i]){
				printf("Are you sure?");
				exist=1;
				target=i;
				break;
			}
		}
	}
	else 
	{
		for(int i=0;i<3;i++){
			if(strcmp(name[i],name[3]));
			else{
				printf("Are you sure?\n");
				exist=1;
				target=i;
				break;
			}
		}
	}
	char ch;
	if(exist==1){
		scanf(" %c",&ch);
		if(ch=='y'){
			for(int i=0;i<3;i++){
				if(i!=target){
					printf("%d %d %s %.2f %.2f %.2f\n",num[i],cla[i],name[i],f[i],s[i],t[i]);
				}
			}
		}
		if(ch=='n'){
			for(int i=0;i<3;i++){
				printf("%d %d %s %.2f %.2f %.2f\n",num[i],cla[i],name[i],f[i],s[i],t[i]);				
				}		
			}
	}
	else{
		for(int i=0;i<3;i++){
				printf("%d %d %s %.2f %.2f %.2f\n",num[i],cla[i],name[i],f[i],s[i],t[i]);				
		}
	}
	return 0;	
 } 
步骤六
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int num[4],cla[4];
float f[4],s[4],t[4],add[4];
int begin,sta;
int n=3;
int insert;
char name[4][10]={{"Zhang"},{"Yang"},{"Liang"}};
void sort(float add[])
{
	int i,j,te;
	float zh;
	char oo[10];
	for(i=n-1;i>sta;i--)
	{
		if(add[i]>add[i-1])
		{
			zh=add[i];add[i]=add[i-1];add[i-1]=zh;
			te=num[i];num[i]=num[i-1];num[i-1]=te;
			zh=f[i];f[i]=f[i-1];f[i-1]=zh;
			zh=s[i];s[i]=s[i-1];s[i-1]=zh;
			zh=t[i];t[i]=t[i-1];t[i-1]=zh;
			strcpy(oo,name[i]);strcpy(name[i],name[i-1]);
			strcpy(name[i-1],oo); 
		}
	}
	if(n!=sta+1)
	 {
	sta++; 
	sort(add);}
}

void div(int clas[])
{
	int i,j,te;
	float zh;
	char oo[10];
	for(i=0;i<n-1;i++)
	{
		if(clas[i]>clas[i+1])
		{
			te=clas[i];clas[i]=clas[i+1];clas[i+1]=te;
			zh=add[i];add[i]=add[i+1];add[i+1]=zh;
			te=num[i];num[i]=num[i+1];num[i+1]=te;
			zh=f[i];f[i]=f[i+1];f[i+1]=zh;
			zh=s[i];s[i]=s[i+1];s[i+1]=zh;
			zh=t[i];t[i]=t[i+1];t[i+1]=zh;
			strcpy(oo,name[i]);strcpy(name[i],name[i+1]);
			strcpy(name[i+1],oo); 
		}
	}
	if(n!=sta+1){
		n--;
	div(clas);}

}
 

int main()
{
void sort(float add[]);
void div(int clas[]);
num[0]=10001;num[1]=10002;num[2]=10003;
cla[0]=11;cla[1]=12;cla[2]=11;
f[0]=99.5;f[1]=77.9;f[2]=92.5;
s[0]=88.5;s[1]=56.5;s[2]=99.0;
t[0]=89.5;t[1]=87.5;t[2]=60.5;
sta=0;begin=0;
div(cla); 
n=3;
int m;
for(m=0;m<n;m++){
	if(cla[m]!=cla[m+1])
		break;
}
sta=m;begin=sta;
sort(add);
n=m+1;
sta=0;begin=sta;
sort(add);
n=3;
int i;
int changer1,changer2,target,input;
float changer4,changer5,changer6;
scanf("%d",&changer1); 
 for(i=0;i<3;i++){
 	if(num[i]==changer1){input=1;break;}
 	else input=0;
 }
 char changer[10]; 
 scanf("%d",&changer2);
 scanf("%s",changer);
 scanf("%f",&changer4);
 scanf("%f",&changer5);
 scanf("%f",&changer6);
 if(input==0){
 	for(i=0;i<3;i++){
 		printf("%d %d %s %.2f %.2f %.2f\n",num[i],cla[i],name[i],f[i],s[i],t[i]);
	 }
 }
 else
 {
 	i=target;
 	cla[i]=changer2;strcpy(name[i],changer);f[i]=changer4;
 	s[i]=changer5;t[i]=changer6;
 	sta=0;begin=0;
	div(cla);
	n=3;
	int m;
	for(m=0;m<n;m++){
		if(cla[m]!=cla[m+1])
			break;
	}
	sta=m;begin=sta;
	sort(add);
	n=m+1;
	sta=0;begin=sta;
	sort(add);
	for(i=0;i<3;i++){
 		printf("%d %d %s %.2f %.2f %.2f\n",num[i],cla[i],name[i],f[i],s[i],t[i]);
	 }
 	
 }
 return 0;
}