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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}
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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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#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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*  **** *** ******  ***  * *   **  * ***** ** *   *   *  
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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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