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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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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#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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