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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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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