TH-buoi2.c

#include <stdio.h>

const float pi = 3.14;
void ToChar(int); // 6a
void GetOrder(char); // 6b
void AreaVolumnGlob(float); // 7
void Power(int); // 8
void HourMinSec(unsigned int); // 9
void SumAllDigit(unsigned int); //10

int main () {
    // functions go here
    // scanf yourself
    return 0;
}

// Bai 6. Buoi 2
void ToChar(int n) {
    printf("%c", n);
}
void GetOrder(char c) {
    printf("%d", c);
}

// Bai 7. Buoi 2
const float pi = 3.14;
void AreaVolumnGlob(float r) {
    printf("Dien tich: %f\n", 4.0 * pi * r*r);
    printf("The tich: %f", 4.0/3 * pi * r*r*r);
}

// Bai 8
void Power(int a) {
    printf("a^2 = %d\n", a*a);
    printf("a^3 = %d\n", a*a*a);
    printf("a^4 = %d", a*a*a*a);
}

// Bai 9. Buoi 2.
void HourMinSec(unsigned int sec) {
    unsigned int hour = sec / 3600;
    unsigned int min = sec % 3600 / 60;
    sec = sec % 3600 % 60;
    printf("%02d:%02d:%02d", hour, min, sec);
}

// Bai 10. Buoi 2.
void SumAllDigit(unsigned int n) {
    // n has exactly 5 digits
    // unsigned sum = 0;
    // for (; n>0; n/=10) sum += n % 10;
    unsigned int sum = n % 10; n /= 10;
    sum += n % 10; n /= 10;
    sum += n % 10; n /= 10;
    sum += n % 10; n /= 10;
    sum += n % 10;
    printf("So nut: %d", sum);
}