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>

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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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Hidden content!
#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
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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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