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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#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)
{
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**** **   * *  ** ** ** *   *** ** ** **  *** *    * * *
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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
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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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