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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Hidden content!
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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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* ***  ** **  ** **   ***   ** ** * * * *    * * *******    ***     *  * *   *    (-b-spD)/(2*a);
 * *  ***    **  *          ***  ** * * **     ** *   * *** *     * *   *      * (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)
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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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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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