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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* ** **  **  * **  *  ** **  ** **    * ** *     **  ** ***** ***   *** * *  * ** *  * *** ** ***  *     ***** ** *   *  ** **   *  * 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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* * ***** *  *   *
 ***   **   * * *  
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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#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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