Remove \n after scanf() which read integer

Question

I am raw and I wrote a lot of basic programs. There is something wrong in my new schedule program. I want to caltculate total park recipes and write on screen it with car number

Answer 1

Standard C input functions only starts processing the input when you press the "Enter" key. Meanwhile, every key you press adds a character to a keyboard buffer.

So basically when you use the scanf function, it does not read the buffer until the "Enter" key has been pressed.

There are workarounds to pass this, but not with the standard C library.

Cheers!

Edit: The code below does not follow the standard C libraries. However, it does what you are asking for :)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

double calculateCharges ( double time1 );

int main( void )
{ //open main

    double time;
    int i,j = 0;
    double TotalCharges=0, TotalTime=0;
    char chTime[10];


    printf("Car\tHours\tCharge\t\n");

    for(i=1;i<=3;i++)   //there is 3 cars checkin
    {  //open for

        printf("%d\t",i);

        // Input the time
        j = 0;
        memset(chTime, '\0', 10);

        while ( 1 )
            {
            chTime[j] = getch();

            // User pressed "Enter"?
            if ( chTime[j] == 0x0d )
            {
                chTime[j] = '\0';
                break;
            }

            printf("%d", atoi(&chTime[j]));
            j++;
        }

        // Convert to the correct type
        time = atoi(&chTime[0]);

        TotalTime+=time;

        printf("\t%lf",calculateCharges(time) ); // fonks calculate

        TotalCharges+=calculateCharges(time);  // for total charge

        puts("");

        } // end for
}  // end main

double calculateCharges ( double time1 )
    {  //open fonk

        double totalC=0;

    if( time1<=3)       // untill 3 hours, for 2 dolars
    {   //open if

        totalC+=2.00;

    }   //end if

    else if(time1>3)      // after 3 hours, each hours cost 0.5 dolars
    {    //open else if

        totalC+=2+(time1-3)*0.5;

    }    //end else if


    return totalC;
} // end fonk

Answer 2

As far as I'm aware this is a "problem" linked to the terminal. When you type something in the terminal your input isn't sent to the program until you press enter and enter will add a new line.

What you have to do is change the terminal behavior, so that everything you type is immediately sent to the program.

Have a look at this question, the top answer will show you how to do what you want to do: How to avoid press enter with any getchar()