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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Hidden content!
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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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*  *   ****** * ****    *       *   **  **    *  *  *  ** **  * ***** * *** **  * * * (-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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-----------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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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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