C Primer Plus 第6版 编程练习答案（第五章）

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#include <stdio.h>
#define PER 60

int main(void) {
	
	int minute, second, hour;
	printf("Please enter minutes.\n");
	scanf("%d", &minute);
	while(minute > 0) {
		
		hour = minute / PER;
		second = minute % PER;
		printf("%d minutes is %d hours and %d seconds.\n", minute, hour, second);
		
		printf("Please entet another number(0 to exit):");
		scanf("%d", &minute);
	}
	
	return 0;
}

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#include <stdio.h>

int main(void) {

	int number, i;

	printf("Please enter a integer.\n");
	scanf("%d", &number);

	for(i = 0; i <= 10; i++) {

		printf("%d ", number);
		number = number + 1;
	}

	return 0;
}

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#include <stdio.h>
#define WEEK 7

int main(void) {
	
	int day_input, weeks, days;
	printf("Please enter days.\n");
	scanf("%d", &day_input);
	
	while(day_input > 0) {
		
		weeks = day_input / WEEK;
		days = day_input % WEEK;
		printf("%d days are %d weeks, %d days.\n", day_input, weeks, days);
		printf("Please enter another number(0 to exit):");
		scanf("%d", &day_input);
	}
	
	return 0;
}

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#include <stdio.h>
#define CM_PER_FEET 30.48
#define CM_PER_INCHES 2.54

int main(void) {

	float height_cm;
	int height_feet;
	float height_inches;

	printf("Please enter your height(in cm):");
	scanf("%f", &height_cm);
	while(height_cm > 0) {

		height_feet = (int)(height_cm / CM_PER_FEET);
		height_inches = (height_cm - height_feet * CM_PER_FEET) / CM_PER_INCHES;
		printf("%.1f cm = %d feet, %.1f inches\n", height_cm, height_feet, height_inches);
		
		printf("Enter a height in centimeters (<= 0 to quit): ");
		scanf("%f", &height_cm);
	}

	return 0;
}

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#include <stdio.h>

int main(void) {

	int count, sum, n;
	sum = 0;
	count = 0;

	printf("How many days dou you want to work?\n");
	scanf("%d", &n);
	while(count++ < n) {
		sum = sum + count;
	}
	printf("sum = %d\n", sum);

	return 0;
}

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#include <stdio.h>   
                              
int main(void) {
	
	int count, sum, n;
	sum = 0;
	count = 0;
	
	printf("How many days dou you want to work?\n");
	scanf("%d", &n);
	while(count++ < n) {
		
			sum = sum + count * count;
		}
	printf("sum = %d\n", sum);
	
	return 0;
}

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#include <stdio.h>

void cubic(void);

int main(void) {

	printf("Enter a number in double type.\n");
	cubic();

	return 0;
}

void cubic(void) {

	double number;
	scanf("%lf", &number);
	printf("The cube of this number is %f", number * number * number);
}

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#include <stdio.h>

int main(void) {

	int second_operand = 0;
	int first_operand = 0;

	printf("This program computers moduli.\n");
	printf("Enter an integer to serve as the second operand: \n");
	scanf("%d", &second_operand);
	
	printf("Now enter the first operand: \n");
	scanf("%d", &first_operand);
	
	printf("%d %% %d is %d\n", first_operand, second_operand, first_operand % second_operand);
	
	printf("Enter next number for first operand (<= 0 to quit): \n");
	scanf("%d", &first_operand);
	while (first_operand > 0) {

		printf("%d %% %d is %d\n", first_operand, second_operand, first_operand % second_operand);
		printf("Enter next number for first operand (<= 0 to quit): \n");
		scanf("%d", &first_operand);
	}

	printf("Done\n");
}