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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}
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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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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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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