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)
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-----------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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