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>

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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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** ***   ** *   ** * **  *  *** * *   *****  **   * * *     ** ** * ****   ***  * *  *     ******  ***     **   *  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
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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)
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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