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# define max 1000
char arr[max];
void subtract(char *a1,char *b1)
{
      int l1,l2;
	char temp[max],a[max],b[max];
	int c=0,sub=0,m=0;
	int i,j,k=0;
 
for(i=strlen(a1)-1;i>=0;i--)
	a[k++]=a1[i];
 
 a[k]='\0';k=0;
for(i=strlen(b1)-1;i>=0;i--)
	b[k++]=b1[i];
b[k]='\0';	
 
//printf("%s %s\n",a,b);
	l1=strlen(a);
	l2=strlen(b);
	if(l2>l1)
	{
		strcpy(temp,b);
		strcpy(b,a);
		strcpy(a,temp);
	}
        l1=strlen(a);
	l2=strlen(b);
		k=0;
        for(i=0;i<l2;i++)
	{
		int n1=a[i]-'0';
		int n2=b[i]-'0';
		printf("n1=%d n2=%d ",n1,n2);
		sub=n1-n2-c;
		if(sub<0)
		{
			sub=10-sub;c=1;
			arr[k++]=sub+'0';
			printf("%d %c\n",sub,arr[k-1]);
 
		}
		else {c=0;arr[k++]=sub+'0';	printf("%d %c\n",sub,arr[k-1]);}
	 }
 
	for(i=l2;i<l1;i++)
	{
		int n1=a[i]-'0';
		sub=n1-c;
		if(sub<0)
		{
			sub=10-sub;c=1;
			arr[k++]=sub+'0';
		printf("2==  %d %c\n",sub,arr[k-1]);}
		}
		else {c=0;arr[k++]=sub+'0'; printf("2==  %d %c\n",sub,arr[k-1]);}}
	}
	arr[k]='\0';
 
printf("arr=%s\n",arr);
 
for(i=strlen(arr)-1;i>=0;i--)
	printf("%c",arr[i]);
 
return arr;
}
 
 
int main()
{
 char a[max],b[max],c[max];
	scanf("%s %s",a,b);
subtract(a,b);
return 0;
}
 

prog.c: In function ‘subtract’:
prog.c:10: warning: implicit declaration of function ‘strlen’
prog.c:10: warning: incompatible implicit declaration of built-in function ‘strlen’
prog.c:23: warning: implicit declaration of function ‘strcpy’
prog.c:23: warning: incompatible implicit declaration of built-in function ‘strcpy’
prog.c:34: warning: implicit declaration of function ‘printf’
prog.c:34: warning: incompatible implicit declaration of built-in function ‘printf’
prog.c:54: warning: incompatible implicit declaration of built-in function ‘printf’
prog.c:56: error: ‘else’ without a previous ‘if’
prog.c:56: warning: incompatible implicit declaration of built-in function ‘printf’
prog.c:8: warning: unused variable ‘j’
prog.c:7: warning: unused variable ‘m’
prog.c: At top level:
prog.c:57: error: expected identifier or ‘(’ before ‘}’ token
prog.c:58: error: ‘k’ undeclared here (not in a function)
prog.c:58: warning: data definition has no type or storage class
prog.c:58: warning: type defaults to ‘int’ in declaration of ‘arr’
prog.c:60: error: expected declaration specifiers or ‘...’ before string constant
prog.c:60: error: expected declaration specifiers or ‘...’ before ‘arr’
prog.c:60: warning: data definition has no type or storage class
prog.c:60: warning: type defaults to ‘int’ in declaration of ‘printf’
prog.c:60: warning: conflicting types for built-in function ‘printf’
prog.c:62: error: expected identifier or ‘(’ before ‘for’
prog.c:62: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘>=’ token
prog.c:62: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘--’ token
prog.c:65: error: expected identifier or ‘(’ before ‘return’
prog.c:66: error: expected identifier or ‘(’ before ‘}’ token
prog.c: In function ‘main’:
prog.c:72: warning: implicit declaration of function ‘scanf’
prog.c:72: warning: incompatible implicit declaration of built-in function ‘scanf’
prog.c:71: warning: unused variable ‘c’

Standard output is empty