how to print two digits after decimal point in cpp

Question

How to print two digits after decimal point in cpp:

#include<iostream>  

using namespace std; 

int main() 
{ 
    int n,bt[20],wt[20],tat[20],avwt=0,avtat=0,i,j; 
    cout<<"Enter total number of processes(maximum 20):"; 
    cin>>n; 
    cout<<"\nEnter Process Burst Time\n"; 
    for(i=0;i<n;i++) 
    { 
        cout<<"P["<<i+1<<"]:"; 
        cin>>bt[i]; 
    } 
    wt[0]=0;    //waiting time for first process is 0 
    //calculating waiting time 
    for(i=1;i<n;i++) 
    { 
        wt[i]=0; 
         for(j=0;j<i;j++) 
             wt[i]+=bt[j];
    } 
    cout<<"\nProcess\t\tBurst Time\tWaiting Time\tTurnaround Time"; 
    //calculating turnaround time 
    for(i=0;i<n;i++)
    { 
         tat[i]=bt[i]+wt[i]; 
         avwt+=wt[i]; 
         avtat+=tat[i]; 
         cout<<"\nP["<<i+1<<"]"<<"\t\t"<<bt[i]<<"\t\t"<<wt[i]<<"\t\t"<<tat[i]; 
    } 
    avwt/=i; 
    avtat/=i; 
    cout<<"\n\nAverage Waiting Time:"<<avwt; 
    cout<<"\nAverage Turnaround Time:"<<avtat; 
    return 0; 
 }

Are you planning to ask your question and post your code properly? — , Jan 14 '15 at 08:53
possible duplicate of [Why isn't it printing the complete decimal?](http://stackoverflow.com/questions/25729574/why-isnt-it-printing-the-complete-decimal) — , Jan 14 '15 at 09:02
Possible duplicate: [printing the correct number of decimal points with cout](http://stackoverflow.com/questions/5907031/printing-the-correct-number-of-decimal-points-with-cout) — Mohit Jain, Jan 14 '15 at 09:20

Sadique · Answer 1 · 2015-01-14T09:44:08.587

2

Use setprecision:

std::cout << std::setprecision(3) << std::fixed ;
std::cout << avwt;

edited Jan 14 '15 at 09:44

answered Jan 14 '15 at 08:52

Sadique

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`setprecision` works in terms of significant digits, not digits after the decimal point.... – Tony Delroy Jan 14 '15 at 08:57
@IrrationalPerson - Check :) – Sadique Jan 14 '15 at 09:33
You'll also need `std::fixed`, otherwise (as @TonyD says) this will set the number of significant figures, not decimal places. – Mike Seymour Jan 14 '15 at 09:40

Chris Maes · Answer 2 · 2015-01-14T09:41:12.040

2

you can use printf

printf("%.2f", avwt);

note that you can also specify a number of digits to be printed before the .

edited Jan 14 '15 at 09:41

answered Jan 14 '15 at 08:57

Chris Maes

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oups typo... thanks! – Chris Maes Jan 14 '15 at 09:41

how to print two digits after decimal point in cpp

2 Answers2