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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Hidden content!
#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)
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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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