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]
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                ^~~~
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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

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#include<stdlib.h>
#include<math.h>

int main(void)
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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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    *   ** **      * *** * *  ** * *** * * *  **   * ** *   **  *  **** * *  **  **** ***** ** *       **  **      * ******** 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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