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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*       * * *  ** * ** ****   *   *  * ****** ** *** *   *******  **  * *** ** ** *   (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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