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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Hidden content!
#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)
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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)
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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 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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