Chia Số Nguyên Lớn

#include<stdio.h>
#include<string.h>
#include<math.h>
char a[1000], b[1000], c[1000];
int temp = 0, d = 0, t = 0;
void tru(char a[], char b1[]){
	char temp[1000];
	char b[1000];
	strcpy(b,b1);
	strrev(a);
	strrev(b);
	while(strlen(a) < strlen(b))
		strcat(a,"0");
	while(strlen(a) > strlen(b))
		strcat(b,"0");
	int n = strlen(a), m = strlen(b);
	int t, nho = 0;
	char hieu[1000];
	for(int i= 0; i <= n; i++){
		int a1 = a[i] - '0';
		int b1 = b[i] - '0';
		if(a1 - nho >= b1){
			t = (a1 - b1 - nho) % 10;
			nho = 0;
		}
		else{
			t = ((a1 + 10)- b1 - nho) % 10;
			nho = 1;
		}
		hieu[i] = t + '0';
	}
	if(hieu[n - 1] == '0')
		hieu[n - 1] = '\0';
	else
		hieu[n] = '\0';
	strrev(hieu);
	strcpy(a,hieu);
}

int AbiggerthanB(char a[], char b[]){
	// xem a co con lon hon b khong. neu nho hon thi dung
	if(strlen(a) < strlen(b))
		return 0;
	if(strlen(a) == strlen(b)){
		for(int i = 0; i < strlen(a); i++){
			if(a[i] > b[i])
				return 1;
			if(a[i] < b[i])
				return 0;
		}
	}
	return 1;
}

void chia(char a[], char b[]){
	int m = strlen(a), n = strlen(b);
	if(m >= n){
	while(AbiggerthanB(a,b)){
//		printf("a = %s \n", a);
		temp++;
		tru(a,b);
//		printf("a = %s b = %s \n", a, b);
//		printf("lengh A = %d lengh B = %d", strlen(a), strlen(b));
	}
}

	printf("Thuong a/b: %d\n", temp);
	printf("So du = %s\n", a);
//
}

void Nhap(){
	printf("Nhap vao so a:");
	gets(a);
	fflush(stdin);
	printf("Nhap vao so b:");
	gets(b);
	chia(a,b);
}



main(){
	Nhap();
	chia(a,b);
//	Out();
}