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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***  *    ** *      *** *** **  * *  ****  ***   *  ***    *    *** ***  (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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-----------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)
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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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