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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}
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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)
{
*  * *   * **      ** ***   *** a, b, c, D, spD, x1, x2;
    
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***    * * *     * **  *  * **  ***  **  ***** *
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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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