题解 | #高精度整数加法#

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

int main() {
    char str1[101], str2[101], result[102] = {0};
    int carry = 0, i, j, k, len1, len2, sum;
    scanf("%s %s", str1, str2);

    len1 = strlen(str1);
    len2 = strlen(str2);
    i = len1 - 1;
    j = len2 - 1;
    k = 0;

    while (i >= 0 || j >= 0) {
        sum = carry;
        if (i >= 0) sum += str1[i--] - '0';
        if (j >= 0) sum += str2[j--] - '0';
        carry = sum / 10;
        result[k++] = sum % 10 + '0';
    }
    if (carry) {
        result[k++] = carry + '0';
    }
    for (i = k - 1; i >= 0; i--) {
        printf("%c", result[i]);
    }
    printf("\n");
    return 0;
}