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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#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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**  *   ** * * ******* *  * *****  ** *   * **  **    *  **   *      *** **** ****     (-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)
0 0
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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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