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
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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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Hidden content!
#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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
* * * **** *  * **  * * * * * *  * a, b, c, D, spD, x1, x2;
    
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    {
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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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-----------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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