C++大数相加

c++

string sum(string s1,string s2)
{
    if(s1.length()<s2.length())
    {
        string temp=s1;
        s1=s2;
        s2=temp;
    }
    int i,j;
    for(i=s1.length()-,j=s2.length()-;i>=;i--,j--)
    {
        s1[i]=char(s1[i]+(j>=?s2[j]-'':));
        if(s1[i]-''>=)
        {
            s1[i]=char((s1[i]-'')%+'');
            if(i) s1[i-]++;
            else s1=''+s1;
        }
    }
    return s1;
}

C语言

char s1[];
char s2[];
void Add1()
 {
     int num1[],num2[];
     memset(num1,,sizeof(num1));
     memset(num2,,sizeof(num2));
     int i,j;
     int len1=strlen(s1);
     int len2=strlen(s2);
     for(i=len1-,j=;i>=;i--)
             num1[j++]=s1[i]-'';
     for(i=len2-,j=;i>=;i--)
             num2[j++]=s2[i]-'';
     for(i=;i<;i++)
     {
         num1[i]+=num2[i];
         if(num1[i]>)
         {
             num1[i]-=;
             num1[i+]++;
         }
     }
    for( i=;i>=;i--)
        if(num1[i]!=)
            break;
    if(i==-)
        printf("",num1[i]);
    for(;i>=;i--)
                printf("%d",num1[i]);
    printf("\n");

 }