百分比显示Inf

Question

程序运行正常，但唯一的错误是百分比值显示inf。当我初始化变量= 1。答案百分比就是我输入的* 100。

我尝试过不同地更改公式和初始化值。 这是我一段时间以来一直尝试更改的程序代码。

#include <iostream>
#include <cmath>
#include <cstring>
#include <cstdlib>

using namespace std;

int main()
{
        //Declaration of Variables;
    int option,total=1;
    float Y1=1,Y2=0,Y3=0,Y4=0,p1=1,p2=0,p3=0,p4=0;

        //Selection of Program;
    while (true)
    {
    cout <<"\nPlease enter program option for BSC: ";
    cout<<"\nPlease enter program option for BIT: ";
    cout<<"\nPlease enter program option for BBA: ";
    cout<<"\nPlease enter program option for BA: ";
    cout<<"\n***************************************";

        //User Prompt to input option;
    cout<<"\nplease enter option\n";

    cin>>option;



        //Choice of Correct answer;
    if(option==1 || option<=4)
{
        cout<<"\nSuccess";
        cout<<"\n***************************************";
        break;
}
        //Choice of Wrong answer;
    else
{
        cout<<"\nInvalid option\n";
        cout<<"Please select correct option\n";
}
    }



        //Enter number of students in each year;
    cout<<"\nplease Enter number of students in year 1: ";
    cin>>Y1;

    cout<<"\nplease Enter number of students in year 2: ";
    cin>>Y2;

    cout<<"\nplease Enter number of students in year 3: ";
    cin>>Y3;

    cout<<"\nplease Enter number of students in year 4: ";
    cin>>Y4;
    cout<<"\n***************************************";
        //Dept. Name based on user's choice;
     switch(option)
    {
        case 1:
        cout<<"\n********DEPT. OF COMPUTER SCIENCE********";
        break;

        case 2:
        cout<<"\n********DEPT. OF INFORMATION & TECHNOLOGY********";
        break;

        case 3:
        cout<<"\n********DEPT. OF BUSINESS********";
        break;

        case 4:
        cout<<"\n********DEPT. OF FINE ARTS********";
        break;

    }


        //Number of students in each year;
    cout<<"\n***************************************";
    cout<<"\nThe no. of students in year 1 is: "<<Y1;
    cout<<"\nThe no. of students in year 2 is: "<<Y2;
    cout<<"\nThe no. of students in year 3 is: "<<Y3;
    cout<<"\nThe no. of students in year 4 is: "<<Y4;
    cout<<"\n***************************************";



        //Percentage of students in each year;
       p1=(Y1/total)*100.00;
       cout<<"\n\npercentage of year 1 students is: "<< p1 << "%";

       p2=(Y2*100.00)/total;
       cout<<"\npercentage of year 2 students is: "<< p2 << "%";


       p3=(Y3/total)*100.00;
       cout<<"\npercentage of year 3 students is: "<< p3 << "%";

       p4=(Y4/total)*100.00;
       cout<<"\npercentage of year 4 students is: "<< p4 <<"%";
       cout<<"\n***************************************\n";


        //Total number of students in the program;
         total=Y1+Y2+Y3+Y4;
       cout<< "\nTotal no. of students in program is: "<<total;


        //Limit of students in each year;
        if (Y1>100)
        {
            cout<<"\n\nThe limit of students enrolled in Y1 is exceeded";
        }

        if (Y2>100)
        {
            cout<<"\n\nThe limit of students enrolled in Y2 is exceeded";
        }

        if (Y3>100)
        {
            cout<<"\n\nThe limit of students enrolled in Y3 is exceeded";
        }

        if (Y4>100)
        {
            cout<<"\n\nThe limit of students enrolled in Y4 is exceeded";
        }

}