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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#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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   ** ***  * *  **   * **** *  **  *  **  ** *** ***   * ** ***    *  * ***  **   ** ** (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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