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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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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 *    *** *** ****    *  * * *   *** *  ***** * ** *  * *     *  *   **  (-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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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)
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-----------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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