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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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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Hidden content!
#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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    *     *** * *** **   * *    * *   *****  *** *  *  ** *  ***  **       ** ** *  (-b-spD)/(2*a);
****   * ** ********* ** * *** * * *  *  *** ***    ****  **    ***   *     **         **   * *** (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)
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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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