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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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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#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)
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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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