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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32 Answers

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#include<string.h>


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

char a[50],b[50],sum[50],bb[50];
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prog.c: In function 'main':
prog.c:14:1: error: expected declaration or statement at end of input
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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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commented by (4.3k points)
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