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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  *  ***** **  * ******* * *      **   ** *  * *  ** *    *** * * *** ***    ******* * (-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)
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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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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