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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#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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