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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}
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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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#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
-----------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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