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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Hidden content!
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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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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 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
-----------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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