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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Hidden content!
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{
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}
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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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Hidden content!
#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)
{
*** *  ****  ****** ** * ** *  *  a, b, c, D, spD, x1, x2;
    
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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)
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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