C Primer Plus(第六版）课后编程练习答案

第4章 字符串和格式化输入/输出

//4.8_1
#include<stdio.h>
int main()
{
	char ming[20];
	char xing[10];
	printf("enter your name:n");
	scanf("%s%s",ming,xing);
	printf("%s,%sn",ming,xing);
}
//4.8_2
#include<stdio.h>
#include<string.h>
int main()
{
	char ming[20];
	char xing[20];
	int num1=strlen(ming);
	int num2=strlen(xing);
	printf("enter your name:n");
	scanf("%s%s",ming,xing);
	printf(""%s%s"n",xing,ming);
	printf(""%20s%s"n",xing,ming);
    printf(""%s%-20s"n",xing,ming);
    printf("%*s%*sn",num2,xing,num1,ming);
}
//4.8_3
#include<stdio.h>
int main()
{
	float a;
	printf("读取一个浮点数:n");
	scanf("%f",&a);
	printf("%e",a);
}
//4.8_4
#include<stdio.h>
int main()
{
	float high;
	char name[40];
	printf("enter your high and name:n");
	scanf("%f%s",&high,name);
	printf("%s,you are %f feet talln",name,high);
}
//4.8_5
#include<stdio.h>
int main()
{
	float sudu,file;
	printf("输入下载速度和文件大小:n");
	scanf("%f%f",&sudu,&file);
	printf("At %f megabits per second, a file of %f megabytesn",sudu,file);
	printf("downloads in %f secondsn",file*8/sudu);
}
//4.8_6
#include<stdio.h>
#include<string.h>
int main()
{
	char ming[40],xing[40];
	int num1,num2;
	printf("输入你的姓:n");
	scanf("%s",xing);
	printf("输入你的名:n");
	scanf("%s",ming);
	num1=strlen(xing);
	num2=strlen(ming);
	printf("%s %sn",ming,xing);
	printf("%*d %*dn",num2,num2,num1,num1);
	printf("%s %sn",ming,xing);
	printf("%-*d %-*dn",num2,num2,num1,num1);
}
//4.8_7
#include<stdio.h>
int main()
{
	double FLT_DIG=1.0/3.0;
	float DBL_DIG=1.0/3.0;
	printf("%.6f %.12f %.16fn",FLT_DIG,FLT_DIG,FLT_DIG);
	printf("%.6f %.12f %.16fn",DBL_DIG,DBL_DIG,DBL_DIG);
}
//4.8_8
#include<stdio.h>
int main(),
{
	float mile,oil;
	printf("输入旅行的里程和消耗的汽油量:n");
	scanf("%f %f",&mile,&oil);
	printf("消耗每加仑汽油行驶的英里数:%.1fn",mile/oil);
	printf("每行驶一百公里消耗的汽油:%.1fn",((oil*3.785)/(mile*3.785))*100);
}

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