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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';
		sub=n1-n2-c;
		if(sub<0)
		{
			sub=10-sub;c=1;
			arr[k++]=sub+'0';
 
		}
		else {c=0;arr[k++]=sub+'0';
	 }
 
	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';
		}
		else {c=0;arr[k++]=sub+'0';}
	}
	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:18: warning: implicit declaration of function ‘printf’
prog.c:18: warning: incompatible implicit declaration of built-in function ‘printf’
prog.c:23: warning: implicit declaration of function ‘strcpy’
prog.c:23: warning: incompatible implicit declaration of built-in function ‘strcpy’
prog.c:62: warning: ‘return’ with a value, in function returning void
prog.c:66: warning: ‘main’ is normally a non-static function
prog.c: In function ‘main’:
prog.c:69: warning: implicit declaration of function ‘scanf’
prog.c:69: warning: incompatible implicit declaration of built-in function ‘scanf’
prog.c:68: warning: unused variable ‘c’
prog.c: In function ‘subtract’:
prog.c:72: error: expected declaration or statement at end of input
prog.c:8: warning: unused variable ‘j’
prog.c:7: warning: unused variable ‘m’

Standard output is empty