Design of sales management system for C language course (big homework)

One 、 Design function ( The article is for reference only )

Try to design a note management system , It can provide the following functions ：
1、 The system works as a menu
2、 Note information entry function ( Note information is saved in a file )－－ Input
3、 After collecting all the notes from last month , Read sales
1） Calculate the sales of each product for each person .
2） Sort salesmen by sales , Output sorting results （ Salesman code ）
3） Count the total sales of each product , For these products, from top to bottom , Output sorting results （ Need to output product code and sales ）( optional )

Two 、 Function display

3、 ... and 、 Mind mapping

Four 、 Program source code

#include <stdio.h>
#include <string.h>
#include <conio.h>
#include <stdlib.h>
#define Z 5
#define R 4 /* Defining macro constants facilitates the generalization of programs */ /*R Indicates the number of salesmen */
typedef struct                 /* Shorten the structure variable name */
{
      int shangpin[Z];          /* Define the structure to facilitate the storage, reading and writing of information , identify */ 
}data;				/*R It means the kind of goods , The last one is the total of the salesperson's products */
void menu()                    
{
    	system("cls");						/* Clear screen command */
	printf("\n\n");
	printf("\t ┏━━━━━━━━━━━━ The main menu ━━━━━━━━━━┓\n");
	printf("\t ┃ 1. Calculate the sales of each product per person last month  ┃\n");
	printf("\t ┃ 2. Sort salesmen by sales , Output sorting results  ┃\n");
	printf("\t ┃ 3. Count the total sales of each product , Output sorting results  ┃\n");
	printf("\t ┃ 4. Output statistical reports  ┃\n");
	printf("\t ┃ 5. End operation  ┃\n");
     printf("\t ┗━━━━━━━━━━━━━━━━━━━━━━━━━┛\n");
}
void f1(data *x)              /* Calculate the sales of each product per person last month */
{
    	FILE *fp;
	char fname[10],hitkey;
	int j,t;                              /* Used to control the cycle */
	int i,k,s;                    /* Used to define employee serial number , Product serial number , Product quantity */
	system("cls");					/* Clear screen command */
	printf(" Which month do you want to calculate ?\n");
	printf(" Please enter the month :");     /* Input file name , In this way, the information of each month can be written */
	scanf("%s",fname);
	strcat(fname,".dat");
	if((fp=fopen(fname,"wb"))==NULL)          /* Open file */
	{
    	printf(" Can't open file ！！！\n");
		exit(0);							/*  normal exit(0); End procedure */
	}
	for(j=0;j<R;j++)                      /* Clear the commodity quantity */
		for(t=0;t<Z;t++)
			(x+j)->shangpin[t]=0;
	printf(" Please enter ：\n Employee number   Product number   sales volumes \n");          /* Prompt the user to write the format of the information */
	for(j=0;hitkey!=27;j++)
	{
    	scanf("%d%d%d",&i,&k,&s);
		if(i>R||i<0||k>Z||k<0) 
		{
    	printf(" Wrong information !\n");   /* Hint , Avoid input errors */
			continue;
		}
		else
			(x+i-1)->shangpin[k-1]=(x+i-1)->shangpin[k-1]+s;          /* Count the quantity of various products of each individual ,-1 To match the ordinal number in the array */
		printf(" To continue typing, press enter , To finish typing, press esc\n");
		printf("━━━━━━━━━━━━━━━━━━━━━━\n");
		hitkey=getch();
		for (;hitkey!=13&&hitkey!=27;)
		hitkey=getch();
	}
	for(j=0;j<R;j++)
		if(fwrite((x+j),sizeof(data),1,fp)!=1)          /* Write the information into the file and you will be called later */
			printf("write error!\n");
	fclose(fp);                             /* Close the file to avoid missing information */
	printf("\n\n\n\n\n\n\t\t\t Saved successfully , Press any key to return to the main menu ！");
    getch();
}



void f2(data *x)         /* Sort salesmen by sales , Output sorting results */
{
    	FILE *fp;
	char fname[10];
	int i,k,j,t,bianhao[R]={
    0},z;
	system("cls");						/* Clear screen command */
	printf(" Which month do you want ?\n");
	printf(" Please enter the month :");        /* Input file name , In this way, the information of each month can be read */
	scanf("%s",fname);
	strcat(fname,".dat");
	if((fp=fopen(fname,"rb"))==NULL)           /* Open file */
	{
    	printf(" Can't open file ！！！\n");
		exit(0);
	}
	for(i=0;i<R;i++)                          /* Read the message */
		if(fread(x+i,sizeof(data),1,fp)!=1)
			printf(" Error reading information ！");         /* Read in information prompt */
	for(i=0;i<R;)                         /* Used to store employee numbers */
		bianhao[i]=i++;
	printf(" Please enter by which product \n");
	scanf("%d",&k);
	k=k-1;                           /* It is convenient to correspond to the array value in the structure */
	for(i=0;i<R;i++)               /* Press K Sort salespeople by product , Sorting by selection */
	{
    	t=i;
		for(j=i+1;j<R;j++)
			if((x+bianhao[t])->shangpin[k]<(x+bianhao[j])->shangpin[k])/* Call the number of products in the corresponding structure of employees */  t=j;
		if(t!=i)
		{
    	z=bianhao[i];
			bianhao[i]=bianhao[t];
			bianhao[t]=z;
		}
	}
	printf("\t\t\t Press %d The order of products to salespeople is :\n",k+1);
	printf("━━━━━━━━━━━━━━━━━━━━━\n");
	for(i=0;i<R;i++)
		printf("\t\t\t The first %d The name is ：  staff %d\n",i+1,bianhao[i]+1);
	printf("\n\n\n\t\t\t Press any key to return to the previous main menu ！");
	getch();
	fclose(fp);		/* Close the read in file */
}



void f3(data *x)     	/* Count the total sales of each product , Output sorting results */
{
    	FILE *fp;
	char fname[10];
	int i,j,sum[Z]={
    0},bianhao[Z]={
    0},z,t,k;
    system("cls");								/* Clear screen command */
	printf(" Which month do you want to calculate ?\n");
	printf(" Please enter the month :");    		/* Input file name , In this way, the information of each month can be read */
	scanf("%s",fname);
	strcat(fname,".dat");
	if((fp=fopen(fname,"rb"))==NULL)             /* Open file */
	{
    	printf(" Can't open file ！！！\n");
		exit(0);
	}
	for(i=0;i<R;i++)                        /* Read the message */
		if(fread(x+i,sizeof(data),1,fp)!=1)
			printf(" Error reading information ！");
	for(i=0;i<Z;i++)                      /* Sum up all kinds of goods */
		for(j=0;j<R;j++)
			sum[i]=sum[i]+(x+j)->shangpin[i];
	for(i=0;i<Z;)                        /* Used to store item numbers */
		bianhao[i]=i++;
	for(i=0;i<Z;i++)
		printf("%3d",bianhao[i]);
    for(i=0;i<Z;i++)              /* Rank products from high to low , Sorting by selection */
	{
    	t=i;
		for(j=i+1;j<Z;j++)    /* When the product changes , The product number also changes , Easy to output */
			if(sum[t]<sum[j])                         
				t=j;
		if(t!=i)
		{
    	k=sum[i];
			sum[i]=sum[t];
			sum[t]=k;
			z=bianhao[i];
			bianhao[i]=bianhao[t];
			bianhao[t]=z;
		}
	}
	printf(" Output product sorting \n");
	printf(" Product number   Number \n");
	printf("━━━━━━━━━━━━━\n");
	for(i=0;i<Z;i++)
	printf("  product %-7d%-1d\n",bianhao[i]+1,sum[i]);
	printf("\n\n\n\t\t\t Press any key to return to the main menu ！");
	getch();
	fclose(fp);					/* Close the read in file */
}



void f4(data *x)                 /* Output statistical reports */
{
    	FILE *fp;
	char fname[10];
    int i,j,sum[Z+1]={
    0};
    system("cls");								/* Clear screen command */
	printf(" Which month do you want to calculate ?\n");
	printf(" Please enter the month :");              /* In fact, enter a file name , In this way, the information of each month can be read */
	scanf("%s",fname);
	strcat(fname,".dat");
	if((fp=fopen(fname,"rb"))==NULL)               /* Open file */
	{
       printf(" Can't open file ！！！\n");
		exit(0);
	}
    for(i=0;i<R;i++)                            /* Read the message */
		if(fread(x+i,sizeof(data),1,fp)!=1)
			printf(" Error reading information ！");
    for(i=0;i<Z;i++)                                /* Sum up all kinds of goods */
		for(j=0;j<R;j++)
			sum[i]=sum[i]+(x+j)->shangpin[i];
    for(i=0;i<Z;i++)                               /* Sum up goods */
		sum[Z]=sum[Z]+sum[i];
	printf("━━━━━━━━━━━━━━━━━━━━━━━━━━━\n");
	printf(" The output statistical report is as follows :\n");                 /* Output statistics as required */
	printf(" Salesman code   Product code   Sum of sales \n");
	for(i=0;i<R;i++)
		for(j=0;j<Z;j++)
			printf("  staff %-8d product %-6d Number %-10d\n",i+1,j+1,(x+i)->shangpin[j]);
	printf("━━━━━━━━━━━━━━━━━━━━━━━━━━━\n");
	for(i=0;i<Z;i++)
	{
    	if(i==0)   
			printf(" product %d The sum of the  %-10d  The sum of the  %-10d\n",i+1,sum[i],sum[Z]);
		else       
			printf(" product %d The sum of the  %-10d\n",i+1,sum[i]);
	}
	printf("\n\n\n\t\t\t Press any key to return to the main menu ！");
	getch();
}



	                       
 main()
{
    	int i,choice;
	data sxy[R];         /*R Indicates the number of employees , The previous macro constants */
printf("\n\n\n\n\n\n\t━━━━━━━━━━━━━━━━━━━━━━━━━\n");
	printf("\t--------------- Welcome to the commodity sales system ！-------------\n");
	printf("\t━━━━━━━━━━━━━━━━━━━━━━━━━\n");
	printf("\n\n\n\n\n\n\t\t\t Press any key to enter the main menu ！"); 
	getch();
	for(i=0;;i++)
	{
    	system("cls");                /* Clear screen command */
		menu();                        /* The main menu function prompts the user how to choose */
		printf(" What do you want to do ?\n");
		printf(" Please select :");            /* Enter the operation to be performed */
		scanf("%d",&choice);
		if(choice==5)   
		{
    		system("cls");						/* Clear screen command */
				printf("\n\n\n\n\n\n\t━━━━━━━━━━━━━━━━━━━━━━━━━\n\n");
				printf("\t--------------- Thank you for using the commodity sales system ！-------------\n\n");
				printf("\t━━━━━━━━━━━━━━━━━━━━━━━━━\n\n");
				printf("\n\n\n\n\n\n\t\t\t Press any key to exit ！(^.^)"); 
				getch();
			break;                       /* Quit the whole program */
		}
		else  
			switch(choice)
		   {
     	case 1 :   f1(sxy); break;      /* Calculate the sales of each product per person last month */
			    case 2 :   f2(sxy);  break;      /* Sort the sales of salespersons by sales amount , And output the sorting result */
			    case 3 :  f3(sxy);   break;        /* Count the total sales of each product , And output the sorting result */
			    case 4 :  f4(sxy);    break;          /* Output statistical reports */
		}
	}
}

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