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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
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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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*   * * *** * * * *  ***   **   * *   *  **        * * * *  ** * ** * * *  (-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)
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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