c语言字符串合并的问题

Question

Answer 1

#include<stdio.h>
#include<string.h>
void str_bin(char a[], char b[]) {
    strcat(a, b);
    int n = strlen(a), i, j, temp;
    for (i = 0; i < n; i++) {
        for (j = i; j < n; j++) {
            if (a[i] > a[j]) {
                temp = a[i];
                a[i] = a[j];
                a[j] = temp;
            }
        }
    }
    for (i = 0; i < n; i++) {
        printf("%c", a[i]);
    }
}
int main() {
    char a[100], b[100];
    scanf("%s",a); scanf("%s",b);
    str_bin(a, b);

return 0;
}