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

int main(void)
{
** ** * **     ** ** * * a, b, c, D, spD, x1, x2;
    
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*   * * **    ****   * * *  *      ******* ** * *    *   ** *   * ** **** 
*** *  **   *    **  *  * **  * *   *   ******    ***  ** ** *  * * **    * *   ** {
  * * *  *    ** * * * **  **  *  * ** *   * *  *****  *   * *  * * * *   *** *   ***   * * *  *   *** *  * *     * ** * ***  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
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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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