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

int main(void)
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Hidden content!
#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)
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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