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>

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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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Hidden content!
#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
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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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