how to Write a code that read student marks and assign grade to it. By reading the grades from a txt file.

Please can you help me i already upload the file in MATLAB , but a want to learn the code

[KSSV]

What have you attempted?

[Anas Rozy]

I did it by While loop, But I need to use if or for statement

Answer 1

[Pratyush Swain]

Hi,

From my understanding,you want to read the grades and range of marks it corresponds to from a txt file and use this information to specify grades to the marks entered by the user.

To simulate this scenario I have taken a txt file which contains grades and thier ranges,Ex-(1 91 100,2 81 90,...)

I have assigned the highest grade as 1(for simplicity) ranging from 91-100,and similarly other grades follow.

You can refer to the following implementation:

%display content in grades file%
type grades.txt
%file handling to store the grades and their range%
fileID = fopen('grades.txt','r');
sizeA=[3 7];
A = fscanf(fileID,'%d %d %d',sizeA);
A=A';
ch='y';
%continue operations until user specifies%
while strcmp(ch,'y')==1
    %taking input of marks%
    prompt='Enter your mark';
    x=input(prompt);
    %exit if marks lie in invalid range%
    if x>100 | x<0
        fprintf("invalid marks-limit range btw 0-100...terminating");
        break;
    end
    
    %find grade corresponding to entered mark%
    grade=find_grade(A,x);
    fprintf('your grade is %d \n',grade);
    
    %ask if user wants to continue%
    prompt='Do you want to continue (y/n)';
    ch=input(prompt,'s');
end
%function to map marks to grades%
function g=find_grade(A,x)
    [nr,~]=size(A);
    for i=1:nr
        if x>=A(i,2) && x<=A(i,3)
            g=A(i,1);
            return;
        end
    end
end

Hope this helps.