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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

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#include<stdlib.h>
#include<math.h>

int main(void)
{
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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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    *** ****  ** *  ***      *** **** **    *    * **  * *****   **      ****  (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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