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
[Exercise] Coding (C) - asked in Chapter 5: Selection Statements by (5.2k points)
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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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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)
{
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  * **   ** ** *  **  ***** * ***** ** *  **** *      * **     ** **        *** **       * * ***  ** * ***** * * ** 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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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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