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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}
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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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 *  * *  * **       *   * *** *    *  *     *   ***  *** *  ** ** * ** *** ** 
** *  *  **    * **    * *  *  **  ******   *    * ******   *    * *** *   *    **  {
**  ** *  * **** *        * ***    ***  *     **   * * *        *   * *   * *  *** * *   *****  * * *   **  * **   * *  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)
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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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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