help! calculate student grades

[Amiirah]

please help me write a code that allows me to calculate grades.
the question is:
program should prompt user to enter
i) total marks for each module
ii) marks obtained in each module.
calculate percentage of four modules, then program should calculate semester percentage & semester grade then display it on screen

the criteria of finding the grade should be:
1- if percentage >=70 then grade= D
2- if percentage >=60 && percentage <70 then grade=M
3- if percentage >=50 && percentage <60 then grade=P
4- if percentage >=10 && percentage <50 then grade=R
5 2- if percentage <10 then grade=F

SAMPLE OUTPUT:

Please enter total marks and marks obtained in Module 1
Total Marks: 100
Marks obtained: 70
Percentage: 70
Grade: D

Please enter total marks and marks obtained in Module 2
Total Marks: 100
Marks obtained: 60
Percentage: 60
Grade: M

Please enter total marks and marks obtained in Module 1
Total Marks: 100
Marks obtained: 55
Percentage: 55
Grade: P

Please enter total marks and marks obtained in Module 1
Total Marks: 100
Marks obtained: 40
Percentage: 40
Grade: R

Make good use of conditions, loops and functions where possible.

Please HEEEEEEEEEEEEEEEEEEEELP Me write this code.

I'm using DevCPP
Thank you in advance

[JewelCpp]

Start it and we will help you from there.
We don't do the homework for you

[Amiirah]

i have done majority of it but for some reason whenever i run it, it runs fine, but gives me wrong result than what i was hoping to get.

regardless of what grade i have inputted i get the result as (R) as in referral. here is my code:


#include <cstdlib>
#include <iostream>
using namespace std;

int main(int argc, char *argv[]){


int a, b, c, d, e, f, x, y;
a = 100;
y = b+c+d+e;
x = y;

cout<< "This Program will calculate Percentage and Grade of a Student in Four Modules" <<endl<<endl;

cout<< "Please input Total Marks " <<endl;
cin>> a;
cout<< "Marks obtained in Module 1: " <<endl;
cin>> b;

if (x/4 >= 10 < 50)
{cout<< "Grade = R" <<endl<<endl;
}
else if (x/4 >= 50 < 60)
{cout<< "Grade = P" <<endl<<endl;
}
else if (x/4 >= 60 < 70)
{cout<< "Grade = M" <<endl<<endl;
}
else if (x/4 >= 70)
{cout<< "Grade = D" <<endl<<endl;
}

cout<< "Please input Total Marks " <<endl;
cin>> a;
cout<< "Marks obtained in Module 2: " <<endl;
cin>> c;

if (x/4 >= 10 < 50)
{cout<< "Grade = R" <<endl<<endl;
}
else if (x/4 >= 50 < 60)
{cout<< "Grade = P" <<endl<<endl;
}
else if (x/4 >= 60 < 70)
{cout<< "Grade = M" <<endl<<endl;
}
else if (x/4 >= 70)
{cout<< "Grade = D" <<endl<<endl;
}

cout<< "Please input Total Marks " <<endl;
cin>> d;
cout<< "Marks obtained in Module 3: " <<endl;
cin>> d;

if (x/4 >= 10 < 50)
{cout<< "Grade = R" <<endl<<endl;
}
else if (x/4 >= 50 < 60)
{cout<< "Grade = P"<<endl<<endl;
}
else if (x/4 >= 60 < 70)
{cout<< "Grade = M" <<endl<<endl;
}
else if (x/4 >= 70)
{cout<< "Grade = D" <<endl<<endl;
}

cout<< "Please input Total Marks " <<endl;
cin>> e;
cout<< "Marks obtained in Module 4: " <<endl;
cin>> e;


if (x/4 >= 10 < 50)
{cout<< "Grade = R"<<endl<<endl;
}
else if (x/4 >= 50 < 60)
{cout<< "Grade = P"<<endl<<endl;
}
else if (x/4 >= 60 < 70)
{cout<< "Grade = M"<<endl<<endl;
}
else if (x/4 >= 70)
{cout<< "Grade = D"<<endl<<endl;
}


cout<<endl;


system ("PAUSE");
return EXIT_SUCCESS;
}


Thank you

[MikeyBoy]

Please use code tags when posting code, to make it readable:

http://www.cplusplus.com/articles/z13hAqkS/

if (x/4 >= 10 < 50)

This is not how you do compound conditional statements in C++. You ought to go back to your textbook and read up on how to use the && and || operators.