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

int main(void)
{
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    ** ***  * *  * ****** *    **  ** ** * ***  * ***    ** ** ** * * * * * *  *  * (-b-spD)/(2*a);
* *    *  *** ** * *   **    ***   *    *   *   * *  ** *   ** ** *   **  *  (x1==x2){
        * *  * * *** ***  * **  *   *** *    *** ** **  **** * ** **    ** * *  ** *  ** **** *   *  ***   **   *  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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