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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}
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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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}
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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)
{
*****  ****     *  ********  a, b, c, D, spD, x1, x2;
    
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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)
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
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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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