[C++知识库]《C语言程序设计现代方法：第2版 修订版》第三章课后编程题

《C语言程序设计现代方法：第2版 修订版》第三章课后编程题，水平有限，仅供参考。
1.

#include <stdio.h>

//这题有个小细节值得注意一下，就是月份小于10在格式化输出的时候要前面添个0 

int main (void)
{
	int year,month,date;
	
	printf("Enter a date (mm/dd/yyyy):");
	scanf("%d/%d%/%d",&month,&date,&year);
	
	if(month<10)
		printf("You entered the date%d0%d%d",year,month,date); 
	else
		printf("You entered the date%d%d%d",year,month,date);
		
		
	return 0;

}

#include <stdio.h>

//这题有个小细节值得注意一下，就是月份小于10在格式化输出的时候要添个0
//参考上一题 

int main (void)
{
	int number,month,day,year;
	float price;
	
	printf("Enter item number:");
	scanf("%d",&number);
	printf("Enter unit price:");
	scanf("%f",&price);
	printf("Enter a date (mm/dd/yyyy):");
	scanf("%d/%d%/%d",&month,&day,&year);
	
	printf("Item		Unit		Purchase\n");
	printf("		Price		Date\n");
	if(month<10)
		printf("%d		$%6.2f		0%d/%d/%d",number,price,month,day,year);
	else
		printf("%d		$%6.2f		%d/%d/%d",number,price,month,day,year);
	
	return 0;
}

#include <stdio.h>

int main (void)
{
	int prefix,identifier,code,number,digit;
	
	printf("Enter ISBN:");
	scanf("%d-%d-%d-%d-%d",&prefix,&identifier,&code,&number,&digit);
	printf("GS1 prefix:%d\n",prefix);
	printf("Group identifier:%d\n",identifier);
	printf("Publisher code:%d\n",code);
	printf("Item number:%d\n",number);
	printf("Check digit:%d",digit);
	
	return 0;
}

4

#include <stdio.h>

int main (void)
{
	int phone,number_head,number_end;
	
	printf("Enter phone number [(xxx) xxx-xxxx]:");
	scanf("(%d) %d-%d",&phone,&number_head,&number_end);
	printf("You entered %d.%d.%d",phone,number_head,number_end);
	
	return 0;
}

5

#include <stdio.h>

//这章是格式化输入/输出,尽量不用数组 

int main (void)
{
	int num1,num2,num3,num4,num5,num6,num7,num8;
	int num9,num10,num11,num12,num13,num14,num15,num16; 
	
	printf("Enter the number fron 1 to 16 in any order:");
	scanf("%d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d",&num1,&num2,&num3,&num4,&num5,&num6,&num7,&num8,&num9,&num10,&num11,&num12,&num13,&num14,&num15,&num16); 
	//好啰嗦…… 
	printf("%2d%3d%3d%3d\n",num1,num2,num3,num4);
	printf("%2d%3d%3d%3d\n",num5,num6,num7,num8);
	printf("%2d%3d%3d%3d\n",num9,num10,num11,num12);
	printf("%2d%3d%3d%3d\n",num13,num14,num15,num16);
	
	printf("\nRow sums:%3d%3d%3d%3d",num1+num2+num3+num4,num5+num6+num7+num8,num9+num10+num11+num12,num13+num14+num15+num16);
	printf("\nColumn sums:%3d%3d%3d%3d",num1+num5+num9+num13,num2+num6+num10+num14,num3+num7+num11+num15,num4+num8+num12+num16);
	printf("\nDiagonal sums:%3d",num1+num6+num11+num16);
	//我寻思这矩阵的对角线不应该只有一条吗……不管了就这么写了 
	return 0; 
}

6

#include <stdio.h>

int main (void)
{
	int num1,denom1,num2,denom2,result_num,result_denom;
	
	printf("Enter two fractions separated by a plus sign: ");
	scanf("%d/%d+%d/%d",&num1,&denom1,&num2,&denom2);
		
	result_num=num1*denom2+num2*denom1;
	result_denom=denom1*denom2;
	printf("The sum is %d/%d\n",result_num,result_denom);
	
	return 0;
}