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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}
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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)
{
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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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