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