Language: C

#include<stdio.h>
int a[10],b[10];
int main()
{
	int i,la=0,lb=0,lmax,c,flag=0,t;
	char ch;
	for(i=1;i<=9;i++)			//謨ー扈??蟋句喧
	{
		a[i]=0;
		b[i]=0;
	}
	while((ch=getchar())!=EOF)
	{
		if(ch>='0'&&ch<='9')
		{
			if(flag==0)
			{
				a[++la]=ch-'0';
			}
			else if(flag==1)
			{
				b[++lb]=ch-'0';
			}
		}
		else if(ch==' ')
		{
			flag=1;
		}
		else if(ch=='\n')
		{
			for(i=1;i<=la/2;i++)			//a[]荳ュ螟ァ謨ー蛟堤スョ
			{
				t=a[i];
				a[i]=a[la+1-i];
				a[la+1-i]=t;
			}
			for(i=1;i<=lb/2;i++)			//b[]荳ュ螟ァ謨ー蛟堤スョ
			{
				t=b[i];
				b[i]=b[lb+1-i];
				b[lb+1-i]=t;
			}
			lmax=la>lb?la:lb;
			c=0;
			for(i=1;i<=lmax+1;i++)			//螟壼、?炊荳?ス搾シ亥屏荳コ譛?ォ倅ス咲嶌蜉?庄閭ス譛芽ソ帑ス搾シ?			{
				t=a[i];
				a[i]=(a[i]+b[i]+c)%10;
				c=(t+b[i]+c)/10;
			}
			for(i=9;i>=0;i--)
			{
				if(a[i]!=0)
				{
					printf("%d\n",i);
					break;
				}
			}
			flag=0;
			la=0;
			lb=0;
			for(i=1;i<=9;i++)			//謨ー扈??鄂ョ
			{
				a[i]=0;
				b[i]=0;
			}
		}
	}
	//譛?錘荳?サ?焚扈?	for(i=1;i<=la/2;i++)			//a[]荳ュ螟ァ謨ー蛟堤スョ
	{
		t=a[i];
		a[i]=a[la+1-i];
		a[la+1-i]=t;
	}
	for(i=1;i<=lb/2;i++)			//b[]荳ュ螟ァ謨ー蛟堤スョ
	{
		t=b[i];
		b[i]=b[lb+1-i];
		b[lb+1-i]=t;
	}
	lmax=la>lb?la:lb;
	c=0;
	for(i=1;i<=lmax;i++)
	{
		a[i]=(a[i]+b[i]+c)%10;
		c=(a[i]+b[i]+c)/10;
	}
	for(i=9;i>=0;i--)
	{
		if(a[i]!=0)
		{
			printf("%d\n",i);
			break;
		}
	}
	return 0;
}

Compiler output:
main.c:69:9: error: expected identifier or '(' before '{' token
   69 |         {
      |         ^
main.c:74:9: error: expected identifier or '(' before 'for'
   74 |         for(i=1;i<=lb/2;i++)                    //b[]荳ュ螟ァ謨ー蛟堤スョ
      |         ^~~
main.c:74:18: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<=' token
   74 |         for(i=1;i<=lb/2;i++)                    //b[]荳ュ螟ァ謨ー蛟堤スョ
      |                  ^~
main.c:74:26: error: expected '=', ',', ';', 'asm' or '__attribute__' before '++' token
   74 |         for(i=1;i<=lb/2;i++)                    //b[]荳ュ螟ァ謨ー蛟堤スョ
      |                          ^~
main.c:80:9: warning: data definition has no type or storage class
   80 |         lmax=la>lb?la:lb;
      |         ^~~~
main.c:80:9: error: type defaults to 'int' in declaration of 'lmax' [-Wimplicit-int]
main.c:80:14: error: 'la' undeclared here (not in a function); did you mean 'a'?
   80 |         lmax=la>lb?la:lb;
      |              ^~
      |              a
main.c:80:17: error: 'lb' undeclared here (not in a function); did you mean 'b'?
   80 |         lmax=la>lb?la:lb;
      |                 ^~
      |                 b
main.c:81:9: warning: data definition has no type or storage class
   81 |         c=0;
      |         ^
main.c:81:9: error: type defaults to 'int' in declaration of 'c' [-Wimplicit-int]
main.c:82:9: error: expected identifier or '(' before 'for'
   82 |         for(i=1;i<=lmax;i++)
      |         ^~~
main.c:82:18: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<=' token
   82 |         for(i=1;i<=lmax;i++)
      |                  ^~
main.c:82:26: error: expected '=', ',', ';', 'asm' or '__attribute__' before '++' token
   82 |         for(i=1;i<=lmax;i++)
      |                          ^~
main.c:87:9: error: expected identifier or '(' before 'for'
   87 |         for(i=9;i>=0;i--)
      |         ^~~
main.c:87:18: error: expected '=', ',', ';', 'asm' or '__attribute__' before '>=' token
   87 |         for(i=9;i>=0;i--)
      |                  ^~
main.c:87:23: error: expected '=', ',', ';', 'asm' or '__attribute__' before '--' token
   87 |         for(i=9;i>=0;i--)
      |                       ^~
main.c:95:9: error: expected identifier or '(' before 'return'
   95 |         return 0;
      |         ^~~~~~
main.c:96:1: error: expected identifier or '(' before '}' token
   96 | }
      | ^