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

int main(void)
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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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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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