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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#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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    * *** * ** * ****  ** * * *  ** ***  **** ***  *   **   ** **  *       *   *** (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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