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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}
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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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Hidden content!
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}
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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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}
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Hidden content!
#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)
{
**  ** *   * * * ** *  *  * * * * a, b, c, D, spD, x1, x2;
    
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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)
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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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