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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#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)
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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
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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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