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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Hidden content!
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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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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)
{
*    * *   *  ***** *    **** a, b, c, D, spD, x1, x2;
    
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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)
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-----------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)
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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
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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