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>

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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* *** * **   * **  *   *****  **       *  *  * *  *  *   ***  ** *****  **** * (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)
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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 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
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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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