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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
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#include<stdlib.h>
#include<math.h>

int main(void)
{
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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
-----------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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