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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56 Answers

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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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#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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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)
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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
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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 1: Correct output
Case 2: Correct output
Case 3: Correct output
commented by (4.3k points)
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#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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