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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}
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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)
{
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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)
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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