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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Hidden content!
#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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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
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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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