10-26 Exercise 3: Find roots of a quadratic equation

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Write a program to find roots of a quadratic equation

A quadratic equation is a second order equation having a single variable. Any quadratic equation can be represented as where a, b and c are constants ( a can't be 0) and x is unknown variable. 

寫一個找二次方程的求根程式

For Example

 is a quadratic equation where a, b and c are 2, 5 and 3 respectively.

To calculate the roots of quadratic equation we can use below formula. There are two solutions of a quadratic equation.

使用下列公式:

x = (-b + sqrt(D))/(2*a)
x = (-b - sqrt(D))/(2*a)

where, D = (b*b-4*a*c) is Discriminant (判別式), which differentiate the nature of the roots of quadratic equation.

For the complex result (複數根):

realPart = -b/(2*a);
imaginaryPart =sqrt(-D)/(2*a);

Note: We have used sqrt() function to find square root which is in math.h library.

 

Example input 1:

1 2 1

Example output 1:

Roots of 1.00x^2 + 2.00x + 1.00 = 0 are real and same
x1 = x2 = -1.00

 

Example input 2:

1 -3 2

Example output 2:

Roots of 1.00x^2 + -3.00x + 2.00 = 0 are real and different
x1 = 2.00
x2 = 1.00

 

Example input 3:

1 2 2

Example output 3:

Roots of 1.00x^2 + 2.00x + 2.00 = 0 are complex and different
x1 = -1.00+1.00i
x2 = -1.00-1.00i
[Exercise] Coding (C) - asked in Chapter 5: Selection Statements by (5.2k points)
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We will continue this question in few days
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Everything is fixed. Enjoy your time with The Judge :)
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ANNNNNNNNNNNNNNNNNNNNNNNNNNGRYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY
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Your code has newline at the end sometime. You learned this lesson many times!
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After i correct the newline in my code,there is still wrong output.However,I had run the program in Codeblocks.The output is still as well as the result. Seeking for help.
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your output lack of 1 space at line 8 when print out "Roots of ...". Please be careful with all small details when working with online judge
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prog.c: In function 'main':
prog.c:9:16: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]
     x1 = (-b + sqrt(D))/(2*a);
                ^~~~
prog.c:9:16: warning: incompatible implicit declaration of built-in function 'sqrt'
prog.c:9:16: note: include '<math.h>' or provide a declaration of 'sqrt'
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Hidden content!
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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

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}
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#include<stdlib.h>
#include<math.h>

int main(void)
{
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}
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prog.c: In function 'main':
prog.c:8:11: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     while(scanf("%lf %lf %lf", &a, &b ,&c)==3)
           ^~~~~
prog.c:8:11: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:11: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:18:17: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
                 printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf",a,b,c,x1);
                 ^~~~~~
prog.c:18:17: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:18:17: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:17: warning: incompatible implicit declaration of built-in function 'printf'
                 printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and different\nx1 = %.2lf\nx2 = %.2lf",a,b,c,x1,x2);
                 ^~~~~~
prog.c:21:17: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:29:13: warning: incompatible implicit declaration of built-in function 'printf'
             printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf",a,b,c,x1);
             ^~~~~~
prog.c:29:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:34:13: warning: incompatible implicit declaration of built-in function 'printf'
             printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf",a,b,c,x1);
             ^~~~~~
prog.c:34:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:41:13: warning: incompatible implicit declaration of built-in function 'printf'
             printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are complex and different\nx1 = %.2lf+%.2lfi\nx2 = %.2lf%.2lfi",a,b,c,x1,x2,x1,x1);
             ^~~~~~
prog.c:41:13: note: include '<stdio.h>' or provide a declaration of 'printf'
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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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* ****  **** **** **  **** *  *  * **  *  ** *    *  * * *  *   * **  *   *  ****  *     *   ***  *******  *** ** * of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf\n",a,b,c,x1);
   *** * ** **   * **   *       * *  *  **   *  ***   *****  **   *  * * *   **** *     **
    * * *  *  * ** *   * ***  ***  * **  ****   * *  *** * ***    * *  * ** *   *     {
   *  * * * *** * ***  *  *  ****** * **  * **  * *  * **  **  * *** ** * **   ** *    ** *** **  * **** *    *  * *  * *   of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and different\nx1 = %.2lf\nx2 = %.2lf\n",a,b,c,x1,x2);
  *** **** *** ** *** **** *   **   ** **   *   *   * ****   **  *** *    * * *
      **    * ***  ** ***        ****  *   * ** * **** ***
*     *  ***  **   **   *  * ****  ***  *  **   ***   **   if(D==0)
** ***  *   *** **     **** * * **  * * *  *** *** * **
** * *   *    * *  * **   * * *    ********** ** * **** *  **   *****    **  ***** * (-b)/(2*a);
   ***  *****      * *     ***  *** **  * *  **  **  * *    *** * ******   *  *  * *
   **  *** * ****   * **      * *  *** * **** *  ***  ** ** * ***  *    ** * *     
* ***    *  ** *  ** * ** * * ** * *  *   *****  *     **  *  *  * ************ *** ** *   * *** ** of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf\n",a,b,c,x1);
 *    *   *** ** ***** **   *   * * *     * *  ***  ***    * ***   * * *  *
 * ************ *  *** **   * ****  *** ***  ** *   *    **** * *****  ** **** ** 
* ** * * **  **** *       ** *  *  * * *  *           **   ***  **  * *** * **  * *  * 
*** *  *   **  * **  *  **   * *   *   **** *****  *  * *   ****  *  
***  **    **   ** *    ***    ** **** **** * **   *     ***  *    * ** *    ** *  **  of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf\n",a,b,c,x1);
 * *     *  ***  *         * ****  * * **    * ***   *  ***   *  * * *  ** ***   ** **
 *  **** ** * *    * ******   *  *   **   **    * * *          **
*   *  *       *   *  **    ** **  ** *  * *    ** *  *   if(D<0)
   *     ** *  * * **     ***  *  * ***  **  ** *  *    *    
* *  *  * ****  * **     *       **  ** ** ****  ** **   ******  **** *  ***      *  (-b)/(2*a);
 *    ** *  * *** ******* * ********  *** *** ** **   ** * *   * ****    * * *  *   **  *   -x1;
 * *** **** * * *    **  *    *  ** ** * *****   **  ** ** ***    *  *  ***    *******  *  **** of %.2lfx^2 + %.2lfx + %.2lf = 0 are complex and different\nx1 = %.2lf+%.2lfi\nx2 = %.2lf%.2lfi",a,b,c,x1,x2,x1,x1);
  *  *   ** **   ***           *  *******    ****
* *      ***  *       *****
    
******* * *  **     *  * *  *   * * * * **   *   *   
 *** *    ***     *  * *****     0;
}
answered by (-249 points)
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Correct output
Case 3: Wrong output
commented by (4.3k points)
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Hidden content!
* ******** **** * *   
 * *   *    * ***** 
** *     *  **** 
int  * * * 
***  ** * *    **   *     *    ***   a, b, c, D, spD, x1, x2;
** * * *** ** ** ***  ** * 
*      *   * ***   *   * * *     **  *  ****  %lf ** ** *    *** ** &b  * * *  * 
   *     {
  *  *******   ** ******  ****      * *** ***   ** ***** ****  - (4*a*c);
  *    * ** ** * **** **    ** ** ****   * **** * **
     *           **   ***
** *   *       {
**     * * * ** ** ** *  *** ***  ** *** * * *  **  ** ***    *  **   
  ***    * ** **  * ***  * ***** *******  ***  * ** * *****  *   x1=  * **  * 
    *  *  *   **   * * **  *** * * *  **   * * ** *           x2= * * * ***
*  *  ** ***   *  * * **    **   *  ****   **  **    **   * **   if (x1==x2){
 *****  *  *   *  ** *** *  *** **  *    * *    ** *   **       * *  **   ***  of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 =   ****** ****     *
 *  ** ***** *******  ********* * *   **  ***  *  * ******  * **      **
 *   *   * ** *** *     ***    ** ****** *  * ** **    else {
     *** ** *  * * *  ** ** * *    ** * *** ** **  ** **    * *   *** * * *  *    *  *   *      *    **   ** * of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and   *  * * * = %.2lf\nx2 =    ****    *  ***** 
***  * *******  ***** * * *  ** **  *    *****  **** * ** *  *  *   ***  *  }
 *  * *  *** ***  ***  **    ** *  ** **  ** **   ***  *
 * ** *** * *** *   * * * * *  *** * * *   ** ** **  *  * ** if(D==0)
 ** ** * **     **  **   {
** **  * * *   *** ***  ********* *  *** *  *       * ***  *  *  *        **  *  **    ** 
  *   *  *  *  * * **  ** *******  * ****** * *** *   ******    * *   * * ****       
*      ** * *        {
 * *     * * * **   *   ****  * *  **  * * **  ** **** **   **    * ** ** * ** ***    * *   *  of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = **  * **** ** 
* ** *****  * ** *** * *  *   ** *  *   * *  * **    ** ****     **  *** * **  *   *
**  *** *  * ***      ** *             *** *  *  * * ****    * * ** **    * *  *  *** ***  **
 *  ***** ***   *  * *** ******  * *   *   *** * * *  *  **  *    *  *** *  *** *   *
  * *             {
** *  ****  * **        **    * * *  *   * ** **    ** * *  *    * *  ** *  *     ***   *  ** of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 =           *  *   **
**  ** ***  * **     **** ** ***   **  ***  ******  **  * ** *  * *  ** * ** *     *  ** *
**   *    ****  * *  *   *****  ** ** * ***   * ** **  
   **  *  *    ****** * * **  **      *  ****** ** ** ****     *  **
    **       *    **   
            x1= ***** 
 **          **** ***  **   **  ** x2= -x1;
* *  ***   * *  ****  **  ***  ***  *    *    * ****    **  ** * **  ***     * ******  *   * ** *   of %.2lfx^2 + %.2lfx + %.2lf = 0 are complex and   *    *  = * * *** ** ** =   * ** *   ** *   ** * *  ******   
*   ** * *** *  ****  **   *     ** * * * ** ** *  * *  
 *  *   **   * ***  ***     *
 * *  *  *     *** *****  *
 ** *    ** *       * *  *** **         *  ** *   
*  *   * * *     ** *** * * * * 0;
}
answered by (-249 points)
0 0
/tmp/ccvUqbC2.o: In function `main':
prog.c:(.text+0x6e): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Wrong output
Case 1: Wrong output
Case 2: Correct output
Case 3: Wrong output
commented by (4.3k points)
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Hidden content!
  **      ***** *  **
*** *    ** ***   * *   
int main(){
  ****     ** **** *   ****   **   a,b,c;
      *** **   ** ***  * *      D;
 *  ****** **   ****  ** *** ** * *   *   %lf   **     * ** **  * **   * **     
*  **  * *   ******* * *     ** **   ** - 4*a*c ;

* * * ****** * *   * * * ****  **   **        *  of %.2fx^2 + %.2fx + %.2f = 0 * ****  ****

 * *  ** * ** * **    * **** *  *
* * *******    *****     *  ****   * *****   ******* ****** ****  *  * *  complex and   *  *  *** * 
*  ****  ** **** * *****  **  *   * ** * * *   ******* *** * ***     * = *    **    *** (-b) / (2*a) ), sqrt(-D) / (2*a) );
*** ** *  * **      **  *****   ** * ** ****   *** **** * ** *   *  =  *  ** * *** ***  (-b) / (2*a) ), sqrt(-D) / (2*a) );
 * **   *** *  ***     * 
 **     * **  * * *   **  if(D==0){
 ** *  ***   *   *     *   *   *** * ***  * *   ** **   * * * *** *  real and same\n");
** ** *  **** * * *  * *** ***  * * **** *    *     *  * * * * **    = x2 = %.2f",( (-b) / (2*a) ) );
 *****  * ** * **  * ** 
 ** * ***** *   ****   *   **   * **  
    * *** **** *   ****** ***   *****   *     *** * * **  *  *   *  real and     *  *** ** ***
  *     **** * *   ****    *          *****    ********** **** ** *  * **  = %.2f\n",( ((-b) + sqrt(D)) / (2*a) ) );
**    *    *      ****      ****  ***      * * *  *   **  * *   * = %.2f", ( ((-b) - sqrt(D)) / (2*a) ) );
  *****  **** * * * * **  ** *  * 

*    * **** **  *  * **   *  0;
}
answered by (-116 points)
0 0
/tmp/cc8OPUJA.o: In function `main':
prog.c:(.text+0x51): undefined reference to `pow'
prog.c:(.text+0xdd): undefined reference to `sqrt'
prog.c:(.text+0x13f): undefined reference to `sqrt'
prog.c:(.text+0x213): undefined reference to `sqrt'
prog.c:(.text+0x26a): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
/tmp/ccLeUfQ5.o: In function `main':
prog.c:(.text+0x51): undefined reference to `pow'
prog.c:(.text+0xdd): undefined reference to `sqrt'
prog.c:(.text+0x13f): undefined reference to `sqrt'
prog.c:(.text+0x213): undefined reference to `sqrt'
prog.c:(.text+0x26a): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
commented by (4.3k points)
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Hidden content!
#include *** ** *   *****
#include <math.h>
int main()
{
  *** *   ****  * * *  * a,b,c,x,y,d;
** *       ** *      * * *****  ******  *    %f *  *   **** * ***   * * ** 
***** *  * *    ** *  ******* ******* 
*       * *  * * *   *  **   * ** *  *   * ** 
 * * *****  **  ** ***      ** **   * 
*  **** *  *  * ** * ** *** (d>0){
  ** **    ** **     ****  ** ***** of %.2fx^2 + %.2fx + %.2f = 0 are real and *   **  *** ****
**  ** **  *  *********  *****  **   = %.2f\nx2 = %.2f",x,y);
*** * **  * ** * * *   * *
***   **  ****** *      if (d==0){
* ** *   ***  *      ** * **   ** **  ***  *  of %.2fx^2 + %.2fx + %.2f = 0 are real and * ** *  *     *    
  *    * **     *       **  ***  * **    = x2 = %.2f",x);
*** * *** ***  *  **   *  
****    * *** *  **  * ** * * 
*   * *  **   **  * **** *****  ** 
*  * ** *   * * *  **   * *    ***  *    *  of %.2fx^2 + %.2fx + %.2f = 0 are complex and  ***  **   *  * **
   *** ** **  ***    **   * ***    * ** 
*    * ** **  * * ***   *******   *  **  = * ** ** * ***   **
  ***  **  **  **   * *  * * ** *   * ** =  *   ** ** ****  
***** *** * ***      *** *  * **

 ***    ***    **  ***      ** 0;
}
answered by (54 points)
1 0
/tmp/ccheVQNV.o: In function `main':
prog.c:(.text+0x87): undefined reference to `sqrt'
prog.c:(.text+0xd5): undefined reference to `sqrt'
prog.c:(.text+0x21f): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
/tmp/ccJPGNPl.o: In function `main':
prog.c:(.text+0x87): undefined reference to `sqrt'
prog.c:(.text+0xd5): undefined reference to `sqrt'
prog.c:(.text+0x21f): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
commented by (4.3k points)
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