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