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www.waraxe.us Forum Index -> C and C++ -> Need some help in on C code
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PostPosted: Sat Sep 04, 2004 11:14 am Reply with quote
waraxe
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Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




Tere tulemast foorumisse!! Smile

I use M$ Visual C++ for programming in C and when i copy-pasted this source code and tried to compiel it, i got 3 warnings and 2 errors.
So what's wrong?

1. line "printf("x1=%lg\nx2=%lg\n",(-b+scrt(d))/(2.0*a),(-b-scrt(d))/(2.0*a)); " must be as "printf("x1=%lg\nx2=%lg\n",(-b+sqrt(d))/(2.0*a),(-b-sqrt(d))/(2.0*a)); "

Because compilator was not able to find function scrt(), and thats just typo, i guess.

2. line "char j,e;" is not needed and get's warning from compiler:
"unreferenced local variables".

3. line "printf("v?rrand on (%lg)*x*x+(%lg)*x(lg)\n",a,b,c); "
there is some code missing before last "lg"...

4. just to be mention - imaginary unit is "i", not "j", as in original source code. Ref: http://mathworld.wolfram.com/ImaginaryUnit.html

So, after all the fix-ups source code will be as:

Code:

/*
   Ruutv?rrandi lahendamise progre
*/
#include <stdio.h>
#include <conio.h>
#include <math.h>
/*
*/
void main(void)

{ double a,b,c,d;
  int v;
 
/*
 Kordajate sisselugemine
*/
 while (1)                          /* vigade puhul saab sisestust korrata */
     {printf("V?rrand on kujus a*x*x+b*x+c=0\n");
     printf("Palun sisesta kordajad:\n");
     while (1)                      /* kordaja ei tohi olla null */
        {printf("a=");
        scanf("%lf",&a);
        if (a)
             break;
        else
             {printf("Niimoodi ei teki ruutv?rrandit!\n");
             printf("palun korrata!\n");}}
printf("b=");
scanf("%lf",&b);
printf("c=");
scanf("%lf",&c);
printf("v?rrand on (%lg)*x*x+(%lg)*x+(%lg)\n",a,b,c);
printf("Kas see vastab teie soovile? (j/e)\n");
while ((v=getch())!='j' &&v!='e'); /* ei tohi reageerida valele s?rmisele */
if (v=='j')
      break;
    else
      printf("\n\n\n\nAlgame otsast peale!\n\n\n");}
/* Reaalarvulised  Lahendid */
if ((d=b*b-4.0*a*c)>=0.0)
   printf("x1=%lg\nx2=%lg\n",(-b+sqrt(d))/(2.0*a),(-b-sqrt(d))/(2.0*a));
   
/*     kompleksarvulised lahendid */
else
   printf("x1=%lg+i*%lg\nx2=%lg-i*%lg\n",
          -b/(2.0*a),sqrt(-d)/(2.0*a),
          -b/(2.0*a),sqrt(-d)/(2.0*a));
/*
  L?PETAMINE
*/
printf("N?GEMISENI");
return;} 


Now it will compile on M$ VC++ 5.0 (don't know about other compilators) and seems to work properly.
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Need some help in on C code
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