c code doesnt work on turbo c++ with the float numbers

Question

#include <stdio.h>
#include <math.h>

int main(void)
{
    double r,d,x,y,pi;

    clrscr();
    printf("Input the value of r and degree: ");
    //scanf("%f",&r);
    //scanf("%f",&d);

    r = 12;
    d = 195;
    pi = 3.14;
    x = r * cos(d * pi/180);
    y = r * sin(d * pi/180);

    printf("The polar form is: (%f,%f)", x, y);
    getch();
}

In the 1st case with defined values of r and d the output comes correct but in 2nd case when I give the input the output doesn't match with the original answer. The code worked on codeblocks but isn't working on turbo c++.

what am I doing wrong in turbo c++?

Answer 1

Mis-matched format specifier. Use "%lf" with a double *

double r,d,x,y,pi;
...
//scanf("%f",&r);
//scanf("%f",&d);
scanf("%lf",&r);
scanf("%lf",&d);

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Better codes checks for success before using r.

if (scanf("%lf",&r) != 1) Handle_Error();

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Output is Cartesian coordinates. @Jens. I'd also recommend a '\n'.

// printf("The polar form is: (%f,%f)", x, y);
printf("The Cartesian form is: (%f,%f)\n", x, y);

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It appears Turbo-C requires "l" when printing double, so use

printf("The Cartesian form is: (%lf,%lf)\n", x, y);

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Little reason to use a low precision pi. Suggest

pi = acos(-1.0);