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

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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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*** *    * ** * *  *   * *      ****   ** ** *         ***  *   **  ***      **    *  (-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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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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