Final Exam 3 (20%)

Question

You are requested to help in writing a program to perform addition of two large number up to 50-digits. In C there is no builtin datatype for large number, but we can use characters and array to solve the problem.

Input: The input will contain two positive integers are separated by a blank, the two positive integers do not exceed 50-digits.

Output: Sum.

寫一個程式輸入兩個大數(最大50個位數)，計算其總合。C語言不提供大數資料型態，但我們可以用字元和陣列來解決這個問題。

Example input:

999999999999999999999999999999 999999999999999999999999999999

Example output:

1999999999999999999999999999998

 

Answer 1

Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{
    int i,j,k,n,t=0,c[53]={};
 * *  ******       * ***** *   a[51],b[51];
** * * ***   *  **** ** ***        * *  %s",a,b);
** * **  *  *     *** *  ** * * * *   *   
   *  * *   ** *     **     *******   *
* * *  * * *   *  **   *  **  * ****   *  **** * 
 *    **** ** * * *   ***  ** ***   *** *  **     *    *
    }
 *** *  *  ******   **   *  ****  ****   * *   ** *
**   *  * *  ** *   **  *  *  *** ** *   * ****    * ** *   *    * * *
    }
   ****** *   ***  ****       **    *   *
* * * * ***    ** *  **  * ** * *  ***  * ***** * *  *   * **  
  ** * ****  *   ** * *  *  **   **** * *  *** *  * *   ** ** *  * *     * ****  
* *******  *********  * *  ** *** ****  *  ***   ** * *    **  **  * * * **    **** * **  *** *
*  *  **   **** ***  * *  **     **  *** * **    *        *
    }
********   ***  ****  *  *   *  **** * 
  *  * **  * **    * * *   * *   ** *   * *   * ** ** * *  * || t!=0){
   ****** *   *******      *** **  *  * * ****  *      ** * *** **** **    * * **  * ** * **     *      *** *
 * **  ****** ** ***   **  ******** ***** *        *  **      ****   ***      *
    * **  * *  ** ****   * **    ****   ** * *    ** 
    }
 ***   *  * ** ** *    * ** * *  0;
}

Comments

prog.c: In function 'main':
prog.c:7:7: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     k=strlen(a)-1;
       ^~~~~~
prog.c:7:7: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:7:7: note: include '<string.h>' or provide a declaration of 'strlen'

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

prog.c: In function 'main':
prog.c:19:22: warning: division by zero [-Wdiv-by-zero]
             c[i]=c[i]%0;
                      ^

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 2

Hidden content!
#include *  * ** ***    *
  **  * ***    * * *

int main()
{
*     **   **  *** **** **   * **  ****  **  ** * 
 *  **   *** *   * * * *   ****** 0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output