Final Exam 3 (20%)

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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

 

[Exam] asked in Final Exam
ID: 42300 - Available when: 2018-01-17 14:00 - Due to: Unlimited
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#include<string.h>


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Hidden content!
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Hidden content!
#include <stdio.h>
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#include<stdio.h>
#include<string.h>

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prog.c: In function 'main':
prog.c:14:1: error: expected declaration or statement at end of input
 {
 ^
prog.c:14:1: error: expected declaration or statement at end of input
commented by (4.3k points)
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prog.c: In function 'main':
prog.c:14:1: error: expected declaration or statement at end of input
 {
 ^
prog.c:14:1: error: expected declaration or statement at end of input
commented by (4.3k points)
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prog.c:8:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'int'
 int main()
 ^~~
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prog.c: In function 'main':
prog.c:7:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
 char s1[50]. s2[50];
            ^
prog.c:7:12: error: expected expression before '.' token
prog.c:10:13: error: 's1' undeclared (first use in this function)
 scanf("%s", s1);
             ^~
prog.c:10:13: note: each undeclared identifier is reported only once for each function it appears in
prog.c:11:13: error: 's2' undeclared (first use in this function)
 scanf("%s", s2);
             ^~
prog.c:12:18: error: expected ';' before '!' token
 for (l1=0;s1[l1] ! = '\0';l1++){
                  ^
prog.c:15:22: error: expected ';' before '!' token
     for (l2=0;s2[l2] ! = '\0';l2++){
                      ^
prog.c:28:1: error: expected declaration or statement at end of input
 }
 ^
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Hidden content!
#include<stdio.h>
#include<string.h>
int main(void)
{
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*  *** **** **  * *  * ****  *  * * *** **** ** ** **   *** **  * *     *** **   * **    * *******  ** *  * **** ***

    }

    return 0;
}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main(){
    char a[50],b[50],sum[51];
 * *       ****  *  * *   * ***  i=0;i<51;i++) sum[i]=-1;
** *** *  *   * *  ***  **** **  **** *** %s",a,b);


    int n=strlen(a),m=strlen(b);
    int stop=n>m?n:m;

    int carry=0;
        * **   *   **       *  * i=1;i<=stop;i++){
*    ***** *   * ****** * ** * *      ** *  * *** *** ***  ** * *** * ****  ** q,w;
   ***      * *****    ** ** *  * *     *     * ***  * ***     ** **  ** * *** **  *******       * 
  * * **** *     *         * * *  *  ** *  **  ***     *** ****   * ** *  *** ***   ****  **    ** * *   * * **** * * *    *
* *  ****  * * *  * *** *  *  * *      *   * * *****    **     ** *  ***  ****  * ** ** if(m<i)
 * * **  ** *  *** ** *** *  *****  *  ** ** ******* * *** ** ***** ** *  *  *       *  ** ***  *   ***       ** *    ****    
***** * * ** * *    **    **     *  ** *    *** *  ** *** * *    * *  **  ****** * * * **
 *   ***  *  *      *       *  **      * * ***  **   ** *  *** ******* *  ** *     ******* * ** *    *   *** ***  ** *  ****  *  *** 

**  *      ****** **  * *    ** ****  *   *  *  *** * **  ** ** *   *   ** *  * **   *  *  ***
***     ****  **  * *  *  ******  ** ****  ***  ** ********     **  * **  *   *    *   **  *           ******* *  *** 
   **** *** ** ***    ** ***** * *****   **  **       * *  *    ***     * *  * * **  **  * * *     * *  *  *** ****** ** *
*** * *   *    *****   *  *  *    *    * * * *  ***   *    *   *** **  ***   * *  * *  * ** * *  *** *   *    * sum[stop-i]=1;
***      **     **    *   ***** **   ********** ** * *****    *  *    *** ***  **    ***  * * *   *****  *** *  sum[stop-i]=0;
* *  * * * ** **     ** * **   ***    * ****  * *    * *  * * *   *   ** *** **
*** **  * * * ** * *   ** *  ** *  ** ** ***  ****  *** * ****  *  * ***    ** * 
  ***** * *  *  *** * **    *    *  ***  ***   *** * *  ******* ********  * *  ** * *  **  *   **** *** * *******
 ***      * **** ***  * **  *** * *  **** ****** ** ** **** ***   * * * * * *
    }

 ** **  **  *  ***    *   ****    *  i=0;i<51;i++){
 * *     * *  **  *** *****   *  *  **  * ***   *  **   * ** * *   printf("%c",sum[i]+'0');
    }


** ** * *********   *** **** 0;
}
answered by (-116 points)
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