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