C Primer Plus编程练习答案（Chapter5）

C Primer Plus编程练习答案（Chapter5）

5.11.1

#include
#define N 60 
int main() {
	float min, hour, sec;
	
	printf("Please enter minute(<=0 quit):");
	scanf_s("%f", &min);

	while (min > 0) {
		hour = min / N;
		sec = min * N;
		printf("There are %.2f hours.n", hour);
		printf("There are %.0f seconds.n", sec);
		printf("n");
		printf("Please enter minute(<=0 quit):");
		scanf_s("%f", &min);
	}

	printf("That's over.");
	return 0;
}

 5.11.2

#include 
int main() {
	int num, tempnum;

	printf("Please enter a integer:");
	scanf_s("%d", &num);
	tempnum = num + 10;

	while (num <= tempnum) {
		printf("%dn", num);	// n or t or ' '
		num++;
	}
}

 5.11.3

#include 
int main() {
	int day, week, rest_day;

	printf("Please enter day number:");
	scanf_s("%d", &day);

	while (day > 0) {
		week = day / 7;
		rest_day = day % 7;
		printf("%d days are %d weeks, %d days.n", day, week, rest_day);

		printf("nPlease enter day number:");
		scanf_s("%d", &day);
	}
	printf("Wrong day number, over.");

	return 0;
}

 5.11.4

#include 
#include 
#define N 2.54  //一英寸的厘米数
#define M 12    //一英尺的英寸数
int main() {
	float height, feet, inch;

	printf("Enter a height in centimeters: ");
	scanf_s("%f", &height);

	while (height > 0) {
		inch = height / N;
		feet = (int)(inch / M);
		inch = inch - M*feet;
		printf("%.1f cm = %.0f feet, %.1f inches",height, feet, inch);
		printf("nEnter a height in centimeters (<=0 to quit):");
		scanf_s("%f", &height);
	}

	printf("bye");

	return 0;
}

 5.11.5

#include 
int main() {
	int day, money = 0;
	int i = 1;

	printf("Please enter the day number: ");
	scanf_s("%d", &day);

	while (i <= day) {
		money += i;
		i++;
	}
	printf("The money you earn is: $%d", money);

	return 0;
}

 5.11.6

#include 
int main() {
	int day, money = 0;
	int i = 1;

	printf("Please enter the day number: ");
	scanf_s("%d", &day);

	while (i <= day) {
		money += i * i;
		i++;
	}
	printf("The money you earn is: $%d", money);

	return 0;
}

 5.11.7

#include 
void cube(double NUM) {
	NUM = NUM * NUM * NUM;
	printf("The cube of number is: %.2f", NUM);
}
int main() {
	double num;
	
	printf("Please enter a float number:");
	scanf_s("%lf", &num);
	cube(num);

	return 0;
}

 5.11.8

#include 
int main() {
	int fstnum, secnum, trdnum;

	printf("This program computes moduli.n");
	printf("Enter an integer to serve as the second operand: ");
	scanf_s("%d", &secnum);
	printf("Now enter the first operand: ");
	scanf_s("%d", &fstnum);

	while (fstnum > 0) {
		trdnum = fstnum % secnum;
		printf("%d %% %d is %dn", fstnum, secnum, trdnum);
		printf("Enter next number for first operand (<= 0 to quit): ");
		scanf_s("%d", &fstnum);
	}

	printf("Done.");

	return 0;
}

 5.11.9

 

#include 
void Temperatures(double Fdegree) {
	double Cdegree, Kdegree;
	Cdegree = 5.0 / 9.0 * (Fdegree - 32.0);
	Kdegree = Cdegree + 273.16;

	printf("The centiagred temperatures is: %.2f^Cn", Cdegree);
	printf("The Kelvin temperatures is : %.2fKn", Kdegree);
}
int main() {
	double fdegree;
	int judge;

	printf("Please enter Fahrenheit degree: ");
	judge = scanf_s("%lf", &fdegree);
	while (judge == 1) {
		Temperatures(fdegree);
		printf("Please enter next Fahrenheit degree: ");
		judge = scanf_s("%lf", &fdegree);
	}

	printf("Done.");

	return 0;
}