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