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#include <stdio.h>
#include <stdlib.h>
#define ENTER 10

/* BAI TAP 1 */

int calculator(double number1, double number2, char op){
	double res;
	switch(op){
		case '+': 
			res = number1 + number2;
			break;
		case '-': 
			res = number1 - number2;
			break;
		case '*': 
			res = number1 * number2;
			break;
		case '/': 
			res = number1 / number2;
			break;
	}
	return res;
}

int baiTap1() {
    double number1, number2, res;
	char op;
	
	printf("Your operator : ");
	scanf("%c", &op);
	
	printf("Your 1st number : ");
	scanf("%lf", &number1);
	
	printf("Your 2nd number : ");
	scanf("%lf", &number2);
	
	res = calculator(number1, number2, op);
	printf("Result of: %lf %c %lf = %lf", number1, op, number2, res);
    
    return 0;
}

/* BAI TAP 2 */

int taxFreeIncome(){
	double pendPersonal = 9000000, pendDependent = 3600000;
	int dependentAmount;
	
	printf("Number of Dependent : ");
	scanf("%d", &dependentAmount);
	
	double taxFree;
	taxFree = 12 * (pendPersonal + dependentAmount * pendDependent);
	return taxFree;
}

double percentTax(double taxableIncome) {
	if(taxableIncome > 18000000)
		return 20;
	if(taxableIncome <= 18000000)
		return 15;
	if(taxableIncome <= 10000000)
		return 10;
	if(taxableIncome <= 5000000)
		return 5;
	if(taxableIncome <= 0)
		return 0;
}

int baiTap2() {
    double yourIncome, taxFree, taxableIncome, incomeTax;
	
	printf("Your Income : ");
	scanf("%lf", &yourIncome);
	
	taxFree = taxFreeIncome();
	printf("Tax-free Income : %lf \n", taxFree);
	
	taxableIncome = yourIncome - taxFree;
	if(taxableIncome <= 0) taxableIncome = 0;
	
	printf("Taxable Income : %lf \n", taxableIncome);
	
	incomeTax = taxableIncome * percentTax(taxableIncome) / 100;
	printf("Income Tax : %lf", incomeTax);
    
	return 0;
}

/* BAI TAP 3*/
int baiTap3() {
    int sum, input;
	
	
	sum = 0;
	do {
		printf("Type a random number: ");
		scanf("%d", &input);
		if(input != 0) sum += input;
	} while (input != 0);
	
	printf("Sum : %d", sum);
    
    return 0;
}

/* BAI TAP 4*/
		
int baiTap4() {
	int x,y,t;
	
	do {
		printf("x = ");
		scanf("%d", &x);
		
		printf("y = ");
		scanf("%d", &y);
		t = x;
		x = y;
		y = t;
		
		printf("x : %d, y : %d \n", x, y);
	} while (x != 0 && y != 0);
	
    return 0;
}

/* BAI TAP 5*/

int baiTap5() {
	int nVowels = 0, nConsonants = 0, nOthers = 0;
	char ch;
	printf("Input something then ENTER\n\n");
	do {
		ch = getchar();
		ch = toupper(ch);
		if(ch >= 'A' && ch <= 'Z'){
			switch(ch){
				case 'A':
				case 'E':
				case 'I':
				case 'O':
				case 'U': 
					nVowels++;
					break;
				default: 
					nConsonants++;
			}
		} else {
			nOthers++;
		}
	} while ( ch != ENTER);
	
	printf("\nnVowels: %d\n", nVowels);
	printf("nConsonants: %d\n", nConsonants);
	printf("nOthers: %d\n", nOthers - 1);	
    
    return 0;
}

/* BAI TAP 6*/

int baiTap6() {
	int code;
	for(code = 0; code <= 255; code++){
		printf("%c : %d, %o, %X\n", code, code, code, code);
		if(code != 0 && code % 20 == 0) {
			printf("Type to continuous...");
			getchar();
		};
	}
    
    return 0;
}

/* BAI TAP 7 */

int baiTap7() {
	char char1, char2, t;
	int dif, code;
	
	printf("Input char 1 : ");
	char1 = getchar();
	getchar();
	printf("Input char 2 : ");
	char2 = getchar();
	
	if(char1 > char2){
		t = char1; char1 = char2; char2 = t;
	}
	dif = char2 - char1;
	printf("Difference = %d\n", dif);
	
	for(code = char1; code <= char2; code++){
		printf("%c : %d, %o, %X\n", code, code, code, code);
	}
    
    return 0;
}

int main() {
	baiTap7();
//	Dung baiTap nao thi doi thanh cai day
	return 0;
}

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