C语言现代方法：第六章课后编程 *** 作练习（1-5，8）

C语言现代方法：第六章课后编程 *** 作练习（1-5，8）

#define _CRT_SECURE_NO_WARNINGS
#include 
//第一题
int main()
{
	float a,max,b;

	printf("Enter a number: ");
	scanf("%f", &a);
	max = a;
	while (max > 0) {
		printf("Enter a number: ");
		scanf("%f", &b);
		if (b <= 0)
			break;
		if (b > max)
			max = b;
	}
	printf("The largest number entered was %-10g", max);//这个保留有效位数有点超出前六章的范围了
	
	return 0;
}
//第二题
int main()
{
	int m, n,a;
	printf("Enter two integers:");
	scanf("%d%d", &m ,&n);

	a = m % n;

	do {
		m = n;
		n = a;
		a = m % n;
	} while (a != 0);
		
	printf("Createst common divisor: %g", n);
	return 0;
}
//第三题
int main()
{
	int a, b, c, d, e,m,n;

	printf("Enter a fraction: ");
	scanf("%d/%d", &a, &b);
	m = a;
	n = b;
	c = m % n;
		do {
			n = c;
			m = n;
			c = m % n;
		} while (c != 0);

		d = a / n;
		e = b / n;
		printf("In lowest terms %d/%d", d , e);
	return 0;
}
//第四题
int main()
{
	float commission, value = 0;

	do {
		printf("Enter value of trade: ");
		scanf("%f", &value);

		if (value == 0)
			return 0;
		if (value < 2500.00f)
			commission = 30.00f + .017f * value;
		else if (value < 6250.00f)
			commission = 56.00f + .0066f * value;
		else if (value < 20000.00f)
			commission = 76.00f + .0034f * value;
		else if (value < 50000.00f)
			commission = 100.00f + .0022f * value;
		else if (value < 500000.00f)
			commission = 155.00f + .017f * value;
		else
			commission = 255.00f + .0009f * value;
		if (commission < 39.00f)
			commission = 39.00f;
		printf("Commission: $%0.2fn", commission);
	} while (value != 0);
	

	return 0;
}
//第五题
int main()
{
	int a = 0, b = 0, c = 0;

	printf("Enter a number:");
	scanf("%d", &a);
	printf("The reversal is: ");
	
	do {
		b = a % 10;
		c = a / 10;
		if (b == 0)
			break;

		a = c;
		printf("%d", b);
			
	} while (1);

	return 0;
}
//第八题
int main()
{
	int days, week=0,i=0;
	printf("Enter number of days in month: ");
	scanf("%d", &days);
	printf("Enter starting day of the week: ");
	scanf("%d", &week);

	for (i = 1;i <= week;i++) {
		printf("    ");
	}
	for (i = 1;i <= days;i++) {
		printf("%4d",i);
		if((i+week)%7==0)
			printf("n");
	}

	return 0;
}