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
[Exercise] Coding (C) - asked in Chapter 5: Selection Statements by (5.2k points)
ID: 28934 - Available when: 2017-10-26 18:00 - Due to: Unlimited
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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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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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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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*      * ***   *** ****  **  **** ***  *       ** *****    * *  ***   **    ****** **  
  **   ***     **   *    * *** ** * *    ** *   *   ** ** **   *  *****  ** ** *** * *  {
**    *** * ****  * ******* * ** ** **  * **** **  *  *** ***   * ***  ** ** *    * *  *  **   ***           *    *** 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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