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
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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>

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