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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*  * *  *  ***    *   *** *** * ****    ***   ******  ** *  *  **** * *** ****    (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)
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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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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