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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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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Hidden content!
#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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*   *** ** ***   *  *       ****   * **  * **   *    ** ****** **  *  **        * ****    *   * ** * **     **        * *** 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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