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
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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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 * ***  *  **  *  * * **** * ****    ***  **   *****   ****** **  ****   *   * *****  *   * ** **  *  **      *   **   *  * ** *  **  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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