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)
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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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Hidden content!
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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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#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)
{
  * *  *    *      ******   * * a, b, c, D, spD, x1, x2;
    
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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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