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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#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 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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