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
[Exercise] Coding (C) - asked in Chapter 5: Selection Statements by (5.2k points)
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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)
{
 **  *    ***** *      ** * a, b, c, D, spD, x1, x2;
    
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 *  * ** *    ***** ** *   ** * **    * * ** **** **
 *  ** ** ***  **  ***    * * *   **   *  ****** *  **     ** **  *      **  * *  ***   ***  
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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)
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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 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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