Simple C language exercise: access to student data

Problem description ：

Data files are now provided students.txt( The data of this topic is randomly generated by the program , Untrue data ), Inside is the student's information , The sample data is as follows ：

full name , Student number , Gender , Age , class

Zhang San ,2017002871, male ,17, big data 1702

Li Si ,2017001765, Woman ,18, Software Engineering 1712

path ,2016009876, male ,20, big data 1701

kid ,2014002715, male ,19, Computer 1402

Wang Ludan ,2017009479, Woman ,22, big data 1702

Zhang San ,2015009321, male ,22, Xinji 1502

 

requirement ：

a)       Read in students.txt Store the data in the memory , The student information is required to be stored in the form of structure array .

b)      Query the student information in the memory according to the user's input , You need to support the following three query modes , You need to provide a menu for users to select query mode ：

 

i.        Query mode 1： Query student information according to name or student number

ii.       Query mode 2： Query student information according to age range

iii.     Query mode 3： Query student information according to class

 

3. I/o sample ：

a)       Query mode 1

Examples 1：

Input ： Zhang San

Output ：

Zhang San ,2017002871, male ,17, big data 1702

Zhang San ,2015009321, male ,22, Xinji 1502

Examples 2：

Input ： 2017009876

Output ：

path ,2016009876, male ,20, big data 1701

b)      Query mode 2     

Examples 1：

Input ： 18 20

Output ：

Li Si ,2017001765, Woman ,18, Software Engineering 1712

path ,2016009876, male ,20, big data 1701

kid ,2014002715, male ,19, Computer 1402

c)      Query mode 3

Examples 1：

Input ： big data 1702

Output ：

Zhang San ,2017002871, male ,17, big data 1702

Wang Ludan ,2017009479, Woman ,22, big data 1702

The problem is simple c Language practice , It is mainly to practice the use of structures and the reading of files , And when reading %[^] Use

The program code is as follows ：

 

#include <stdio.h>
#include <string.h>
struct student
{
    char name[30];
    char number[30];
    char sex[10];
    int age;
    char classes[30];
};
int main()
{
    int num,num2,num3,num4;
    long int num1;
    FILE *fp;
    char temp[30],mode[30];
    struct student students[1000];
    if((fp=fopen("./students.txt","r"))==NULL)//open the file
    {
        printf("can not open file students.txt,please check if the file is in the same path.\n");
        system("pause");
        exit(1);
    }
    for(num=0;!feof(fp);num++)//read the file
    {
        fscanf(fp,"%[^,],%[^,],%[^,],%d,%s\n",&students[num].number,students[num].name,students[num].sex,&students[num].age,students[num].classes);
    }
    while(1)
    {
        system("cls");
        printf("               __________________________________________\n");
        printf("    ----------|Welcome to the student information system|-----------\n");
        printf("              ------------------------------------------\n");
        printf("    |mode1:Query student information by name or student number.     |\n");
        printf("    |mode2:Inquire about student information according to age range.|\n");
        printf("    |mode3:Check the student information according to the class.    |\n");
        printf("    |mode4:List all student information.                            |\n");
        printf("    |There are %d student's information in the system              |\n",num);
        printf("     ---------------------------------------------------------------\n");
        printf("    Please enter the query mode,enter is the return key.Enter 'q' to exit the program.\n");
        printf("    mode:");
        scanf("%s",&mode);//the welcome screen
        fflush(stdin);
        if(mode[0]==49)//mode1
        {
            system("cls");
            printf("please input the student's name or number:");
            scanf("%29s",temp);
            fflush(stdin);
            if(temp[0]<0)
            {
                for(num1=0,num3=0;num1<num;num1++)
                    {
                        if(!strcmp(temp,students[num1].name))
                        printf("%s,%s,%s,%d,%s\n",students[num1].name,students[num1].number,students[num1].sex,students[num1].age,students[num1].classes),num3++;
                    }
                if(num3==0) printf("can not find this name\n");
            }

            else
            {
                for(num1=0,num3=0;num1<num;num1++)
                    {
                        if(!strcmp(temp,students[num1].number))
                        printf("%s,%s,%s,%d,%s\n",students[num1].name,students[num1].number,students[num1].sex,students[num1].age,students[num1].classes),num3++;
                    }
                if(num3==0) printf("can not find this number\n");
            }
            system("pause");
        }
        else if(mode[0]==50)//mode2
        {
            system("cls");
            printf("please input the age range you need tu query:");
            scanf("%d %d",&num2,&num3);
            getchar();
            for(num1=0,num4=0;num1<num;num1++)
                {
                    if(students[num1].age>=num2&&students[num1].age<=num3)
                    printf("%s,%s,%s,%d,%s\n",students[num1].name,students[num1].number,students[num1].sex,students[num1].age,students[num1].classes),num4++;
                }
                if(num4==0) printf("can not find a term that meet the crietra\n");
                getch();
        }
        else if(mode[0]==51)//mode3
        {
            system("cls");
            printf("please input the class you want to find:");
            scanf("%s",temp);
            getchar();
            for(num1=0,num3=0;num1<num;num1++)
                    {
                        if(!strcmp(temp,students[num1].classes))
                        printf("%s,%s,%s,%d,%s\n",students[num1].name,students[num1].number,students[num1].sex,students[num1].age,students[num1].classes),num3++;
                    }
            if(num3==0) printf("the class wan not found\n");
            system("pause");
        }
        else if (mode[0]==52)//mode4
        {
            system("cls");
            printf("name,number,sex,age,class\n");
            for(num1=0;num1<num;num1++)
            {
                printf("%s,%s,%s,%d,%s\n",students[num1].name,students[num1].number,students[num1].sex,students[num1].age,students[num1].classes);
            }
            system("pause");
        }
        else if(mode[0]=='q') break;//exit
        else//input error
        {
            printf("can not find this mode\n");
            system("pause");
        }
    }
    fclose(fp);
    return 0;
}