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>

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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)
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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