Decision Making- Nested If else in C++ (OOPs)

This statement can be used to select any one statement or a block which contains a set of instructions. Only that statement will execute which is true according to the data entered and rest other conditions will not executed.

FORMAT:
if(expression1)
Statement1;
else if(expression2)
statement2;
else if(expression3)
statement3;

/* Program to enter student details and allow the grade to the students according to his scores*/

#include<iostream.h>

#include<conio.h>

main()

{

      int roll,s1,s2,s3,s4,s5;

      float per;

      char name[10];

      cout<<"\n Enter student's name and roll number";

      cin>>name>>roll;

      cout<<"\n Enter marks in Physics, Chemistry, Maths, English, Physical";

      cin>>s1>>s2>>s3>>s4>>s5;

      per=(s1+s2+s3+s4+s5)/5.0;

      if(per>=90.0)

      {

                   cout<<"\n R.No.\tName\tPercentage";

                   cout<<"\n "<<roll<<"\t"<<name<<"\t"<<per;

                   cout<<"\n A+: Brilliant Performace";

                   }

      else if(per>=80.0 && per<90.0)

      {

           cout<<"\n R.No.\tName\tPercentage";

           cout<<"\n "<<roll<<"\t"<<name<<"\t"<<per;

           cout<<"\n A: Good Performance";

           }

      else if(per>=70.0 && per<80.0)

      {

           cout<<"\n R.No.\tName\tPercentage";

           cout<<"\n "<<roll<<"\t"<<name<<"\t"<<per;

           cout<<"\n B+: Average Performance";

           }

      else if(per>=60.0 && per<70.0)

      {

           cout<<"\n R.No.\tName\tPercentage";

           cout<<"\n "<<roll<<"\t"<<name<<"\t"<<per;

           cout<<"\n B: OK Performance";

           }

      else if(per<60.0)

      {

           cout<<"\n R.No.\tName\tPercentage";

           cout<<"\n "<<roll<<"\t"<<name<<"\t"<<per;

           cout<<"\n C+: Just Pass";

           }

      else

      {

          cout<<"\n R.No.\tName\tPercentage";

          cout<<"\n "<<roll<<"\t"<<name<<"\t"<<per;

          cout<<"\n C: FAIL";

          }

      getch();

      }