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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#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)
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-----------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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