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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{
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}
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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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}
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Hidden content!
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}
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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)
{
* ***  * *   * *  *  ** ** ** ** a, b, c, D, spD, x1, x2;
    
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    {
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* ***** *  ***   *      *** *  * *    ***   * * *  *****
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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)
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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