使用文件结构将数据从一个程序移动到另一程序

Question

Program(A)-----> file.txt-----> Program(B)

^This is the format I am using, I currently don't have enough knowledge with file structures. My text file is named myStudents.txt

EDIT: Program(A) writes the information properly. Program(B) needs to retrieve the information from the text file.

#include<stdio.h>

int main()
{
    char studentName[50];
    int grade=0;

    printf("Which students grade would you like to retrieve?: ");
    scanf("%s",&studentName);

    FILE *fptr;
    fptr = (fopen("myStudents.txt", "r"));

    if(fptr == NULL)
    {
        printf("Error!");
        exit(1);
    }
    printf("\nStudent details:\n");
    fscanf(fptr,"%d %[^\n]s",grade,studentName);
    printf("Name: %s\n",studentName);
    printf("Grade: %d\n",grade);

    fclose(fptr);
return 0;
}

I'm very confused on how to use program A's information in program B. Apologies if this is a repeat thread, I couldn't find any information here or anywhere else to solve my issue.

*Note(A solid explanation would be very helpful along with any constructive criticism)

Cheers! Have a good day!

Answer 1

Your program B does actually not search for any name, it just tries to print the first one. I won't write the complete code for you but here is a little help with what your program should do:

1. read in the file line by line. (functions fscanf , fgets or getline may be useful)
2. extract the name and grade out of the line. ( sscanf and all string functions)
3. check if the name is the one you are looking for, if yes print it and stop.

This is of course only an example what the program could look like, but i suggest to start by implementing this steps.