c++ using user input data for multiple functions

Question

Hi i am looking to write a program for a arbitrary triangle. Whilst i have completed the first part of my task which is to find if the triangle is either true or false. i want to be able to use the data inputted by the user to calculate the perimeter then eventually the area of the triangle.

But when the perimeter is calculated it is rather huge number.

This is my code so far.#include "stdafx.h"
#include "math.h"

    enter code here

// ConsoleApplication6.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "math.h"

/* enter three variables a, b ,c to create a triangle*/
int main()
{
    double a;   /*insert dimensions of side a*/
    double b;   /*insert dimensions of side b*/
    double c;   /*insert dimensions of side c*/
    double p;   /*variable for the perimeter of a triangle*/
    double s;   /*variable for the area of a triangle*/

    /* Get the user to enter the dimensions of a*/
    printf_s("enter the  dimensions of a: ");   
    scanf_s("%d", &a);                          

    /* Get the user to enter the dimensions of b*/
    printf_s("enter the  dimensions of b: ");   
    scanf_s("%d", &b);
    /* Get the user to enter the dimensions of c*/
    printf_s("enter the  dimensions of c: ");   
    scanf_s("%d", &c);                          

    /* Conditions of a triangle*/
    if ("a + b > c && a + c > b && b + c > a")  

        printf_s("True\n");     /* Display True if able to make a triangle*/

    else printf_s("False\n"); /* Display false if unable to make a triangle*/

    double p = a + b + c;   

    /*Scan user input data a, b, c*/
    scanf_s("%d", &a, "%d", &b, "%d", &c);

    /*output total perimeter*/
    printf_s("The perimeter of the triangle is: ""%d, p");  





    return 0;
}

This is not C. Remove the printf and scanf stuff and use std::cout and std::cin. — Christian Hackl
– Christian Hackl, Commented Apr 9, 2017 at 10:34

xhg · Accepted Answer · 2017-04-09 09:31:32Z

1

The problems is that all %d should be replaced by %lf in order to match the type double.

And also remove the line scanf_s("%d", &a, "%d", &b, "%d", &c);, once you scan once, you cannot scan again to get the same value.

edited Apr 9, 2017 at 9:31

answered Apr 9, 2017 at 9:22

xhg

1,9033 gold badges22 silver badges36 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Elijah Ceeney Over a year ago

i have changed all the %d to %lf and now i receive 0.0000 i also only want to input this data only once instead of doing it a again.

xhg Over a year ago

@ElijahCeeney remove the line scanf_s("%d", &a, "%d", &b, "%d", &c);,

Elijah Ceeney Over a year ago

Thank you Im still getting the issue of perimeter equaling 0.000 instead of a + b + c.

xhg Over a year ago

@ElijahCeeney It is because your program also contains a lot of typos: for example: printf_s("The perimeter of the triangle is: ""%d, p"); should be printf_s("The perimeter of the triangle is: %d", p);; if ("a + b > c && a + c > b && b + c > a") should be if (a + b > c && a + c > b && b + c > a). You need to learn and practice more to avoid this kinds of errors.

Collectives™ on Stack Overflow

c++ using user input data for multiple functions

1 Answer 1

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related