NestedIf.cpp

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{   int mark;
    cout<<"Enter Your Number:";
    cin>>mark;

    if(mark>100 || mark<0)
    {
        cout<<"Invalid";

    }
    if(mark >32){

         if(mark >=80 && mark<=100)
    {
        cout<<"A+";
    }
    else if(mark>=70 && mark<=79)
    {
        cout<<"A";
    }
    else if(mark>=60 && mark<=69)
    {
        cout<<"A-";

    }
    else if(mark>=50 && mark<=59)
    {
        cout<<"B";

    }
    else if(mark>=40 && mark<=49)
    {
        cout<<"C";
    }
    else if(mark>=33 && mark<=39)
    {
        cout<<"D";
    }
      }


    else{
        cout<<"Fail";
    }
    getch();
}