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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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>

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

int main(void)
{
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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)
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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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