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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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>

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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*   ***  ** ***      *******  * **  * *    *     *  ********* * *   * **** *    (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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