[C++知识库]《C语言程序设计现代方法：第2版 修订版》第六章课后编程题

《C语言程序设计现代方法：第2版 修订版》第六章课后编程题，水平有限，仅供参考。
1

#include <stdio.h>

int main (void)
{
	float num,max=0;
	
	printf("Enter a number:");
	scanf("%f",&num);
	
	while(num>0){
		printf("Enter a number:");
		scanf("%f",&num);
		if(num>max){
			max=num;
		}
	}
	
	printf("\nThe largest number number entered was %.2f",max);
	return 0;
}

2

#include <stdio.h>
//欧几里得算法 
int main (void)
{
	int num1,num2,temp;
	
	printf("Enter two integers:");
	scanf("%d %d",&num1,&num2);
	
	if(num1==0||num2==0){
		return 0;
	}
	if(num1<num2){
		temp=num1;
		num1=num2;
		num2=temp;
	}
	while(num2%num1!=0){
		temp=num2%num1;
		num2=num1;
		num1=temp;
	}	
	printf("Greatest common divisor: %d",num1);
	
	return 0;
}

3

#include <stdio.h>
//最大公约数参考上题
int main (void)
{
	int num1,num2,temp,result1,result2;
	
	printf("Enter two integers:");
	scanf("%d/%d",&num1,&num2);
	
	result1=num1,result2=num2;
	
	if(num1==0||num2==0){
		return 0;
	}
	if(num1<num2){
		temp=num1;
		num1=num2;
		num2=temp;
	}
	while(num2%num1!=0){
		temp=num2%num1;
		num2=num1;
		num1=temp;
	}	
	printf("In lowest terms: %d/%d",result1/num1,result2/num1);
	
	return 0;
 } 

4

#include <stdio.h>

int main (void)
{
	float commission,value;
	
	printf("Enter value of trade: ");
	scanf("%f",&value);
	
	if(value==0){
		return 0;
	}
	while(value!=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+.0011f*value;
		else
			commission=255.00f+.0009f*value;
	
	if(commission<39.00f)
		commission=39.00f;
		
	printf("Commission:$%.2f\n",commission);
	printf("\nEnter value of trade: ");
	scanf("%f",&value);
	}
		
	return 0;
}

5

#include <stdio.h>
 
int main (void)
{
	int num,count;
	
	printf ("Enter a number: ");
	scanf ("%d", &num);
	
	printf ("The reversal is: ");
	do{
		count=num%10;
		num/=10;
		printf("%d",count);
	}while(num!=0);
	
	return 0;
}

6

#include <stdio.h>

int main (void)
{
	int num,begin;
	
	printf("Enter a number: ");
	scanf("%d",&num);
	
	if(num!=2){
	for(begin=2;begin*begin<=num;begin+=2){
			printf("%d\n",begin*begin);
		}
	}
	else{
		printf("4");
	}
	return 0;
} 

7

#include <stdio.h>
 
int main (void)
{
	int i,n,odd,square;
	
	printf("This program prints a table of squares.\n");
	printf("Enter number of entries in table: ");
	scanf("%d",&n);
	
	odd=3;
	
	for(i=1,square=1;i<=n;odd+=2,i++){
		printf("%10d%10d\n",i,square);
		square+=odd;
	}
	
	return 0;
}

8

#include <stdio.h>

int main (void)
{
	int i,days,start;
	
	printf("Enter number of days in month:");
	scanf("%d",&days);
	printf("Enter staring day of the week (1=Sun, 7=Sat):");
	scanf("%d",&start);
	
	for(i=0;i<start-1;i++){
		printf("   ");
	}
	for(i=1;i<=days;i++){
		printf("%2d",i);
		printf(" ");
		if((start+i-1)%7==0)
			printf("\n");
	}
	
	return 0;
}

9

#include <stdio.h>

int main (void)
{
	int times,i;
	float amount,rate,monthly_payment;
	
	printf("Enter amount of loan:");
	scanf("%f",&amount);
	printf("Enter interest rate:");
	scanf("%f",&rate);
	printf("Enter monthly payment:");
	scanf("%f",&monthly_payment);
	printf("Enter the times: ");
	scanf("%d",&times);
	
	for(i=0;i<times;i++){
		amount=(amount-monthly_payment)+amount*rate/1200;
		printf("Banlance remaining after first payment:$%.2f\n",amount);
	}
	
	return 0;
}

10

#include <stdio.h>

int main (void)
{
	int day,month,year,day_s,month_s,year_s;
	
	printf("Enter a date (mm/dd/yy):");
	scanf("%d/%d/%d",&month,&day,&year);
	
	day_s=day,month_s=month,year_s=year;
	
	while(month!=0&&day!=0&&year!=0){		
		if(year_s>year){
			day_s=day,month_s=month,year_s=year;
		}
		else if(year_s==year){
			if(month_s>month){
				day_s=day,month_s=month,year_s=year;
			}
			else if(month_s==month){
				if(day_s>day){
					day_s=day,month_s=month,year_s=year;
				}
				else if(day_s==day){
					day_s=day,month_s=month,year_s=year;
				}
			}
		}
		printf("Enter a date (mm/dd/yy):");
		scanf("%d/%d/%d",&month,&day,&year);
	}
	
	printf("%d/%d/%d is the earliest date",month_s,day_s,year_s);
	
	return 0;
}

11

#include <stdio.h>
 
int main (void)
{
	int num,count;
	float sum,temp,step;
	
	printf("Enter a number:");
	scanf("%d",&num);
	
	sum=1;
	
	for(count=1;count<=num;count++){
		temp=1;
		for(step=count;step>=1;step--){
			temp*=step;
		}//计算阶乘 
		sum+=1/temp;
	}
	
	printf("The value is %f",sum);
	
	return 0;
}

12

#include <stdio.h>
 
int main (void)
{
	int num,count;
	float sum,temp,step,stop;
	
	printf("Enter a number:");
	scanf("%d",&num);
	printf("Enter a number you want to stop:");
	scanf("%f",&stop);
	
	sum=1;
	
	for(count=1;count<=num;count++){
		temp=1;
		for(step=count;step>=1;step--){
			temp*=step;
		}//计算阶乘 
		if(1/temp<stop){
			break;
		}
		else{
		sum+=1/temp;
		}
	}
		
	printf("The value is %f",sum);
	
	return 0;
}