程序 两个数的加法 除法 步骤 截图或手写过程

//大数加法， 看成字符串输入
        scanf("%s%s",str1,str2);
        int len1,len2;
        len1=strlen(str1);
        len2=strlen(str2);
        j=0;
        for(i=len1-1;i>=0;i--)
        {
            num1[j]=str1[i]-'0';
            j++;
        }
        j=0;    
        for(i=len2-1;i>=0;i--)
        {
            num2[j]=str2[i]-'0';
            j++;
        }
        int len;
        if(len1>len2)
        {
            len=len1;
            for(j=len2;j                num2[j]=0;
        }
        else{
            len=len2;
            for(j=len1;j                num1[j]=0;
        }
        
        for(j=0;j        {
            num1[j]+=num2[j];
            if(num1[j]>9&&j            {
                num1[j+1]++;
                num1[j]-=10;
            }
        }
        
        
 //  普通
  printf("%d\n",a +b );