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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         **  * * ****** *  * *  **      *    *** *  *   * * ** * **    ****  (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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