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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Hidden content!
#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)
{
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*** ***   * ** **  * * **   *  **  ******* * ** * ***  
****** * * ** **  * **   * *  ******  ** *   * *** **    *****       *
 *** * *    *     ** ** *  *** * *** * **** * **** * 
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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)
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)
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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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