已知A、B分别是m、n位（位数为10-30的随机正整数）的随机正整数，编写程序给出这两个数相加结果。如：A=47858628539074，B= 212821064467，C=A+B=48071449603541 C语言

#include <stdio.h>
#include <string.h>

#define MAX_N 30

void reverse(char s[], int len)
{
for (int i = 0; i < len / 2; i++) {
char tmp = s[i];
s[i] = s[len - i - 1];
s[len - i - 1] = tmp;
}
}

void add(char a[], char b[], char c[])
{
int len_a = strlen(a);
int len_b = strlen(b);
int len_c = len_a > len_b ? len_a : len_b;
int carry = 0;

for (int i = 0; i < len_c; i++) {
int digit_a = i < len_a ? a[i] - '0' : 0;
int digit_b = i < len_b ? b[i] - '0' : 0;
int sum = digit_a + digit_b + carry;
carry = sum / 10;
c[i] = sum % 10 + '0';
}

if (carry) {
c[len_c] = carry + '0';
len_c++;
}

c[len_c] = '\0';
reverse(c, len_c);
}

int main()
{
char a[MAX_N + 1];
char b[MAX_N + 1];
char c[MAX_N + 2];

printf("Please enter two positive integers:\n");
scanf("%s%s", a, b);

add(a, b, c);

printf("The sum is: %s\n", c);

return 0;
}