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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}
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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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