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)
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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-----------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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