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

int main(void)
{
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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
-----------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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