数位拆分v1.0

#include "stdio.h"
#include "math.h"
int main() {
    int n = 4321;
    int a = n / 100, b = n % 100;
    printf("a=%d,b=%d\n", a, b);
    printf("a+b=%d\n", a + b);
    printf("a-b=%d\n", a - b);
    printf("a*b=%d\n", a * b);
    printf("a/b=%.2f\n", a*1.0/b);
    printf("a%%b=%d\n", a%b);
    return 0;
}