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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}
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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)
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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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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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