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

int main(void)
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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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