C++ DAY3

1.输入名字将名和姓输出顺序改变

#include 
int main()
{
	char firstname[20],lastname[20];
	
	printf("Please enter your firstname.");
	scanf("%19s",firstname);
	printf("Please enter you lastname.");
	scanf("%19s,",lastname);
	printf("Hello!%s,%s.n",lastname,firstname);
	
	return 0;
}

2.

#include 
#include 
int main()
{	
	int len=0;
	char name[20];
	printf("Write yor name.n");
	scanf("%19s",name);
	len=strlen(name); 
    printf("Print your name:n");
    printf("a."%s"n", name);
    printf("b."%20s"n", name);
    printf("c."%-20s"n", name);
    printf("d.%*sn", len + 3, name);
	
	return 0;
}

结果

3.

先输入浮点数，再输出别的

#include 
int main()
{
	float a;
	printf("put in a float number: ");
	scanf("%f",&a);
	printf("The in put is %.1f or %.1e.",a,a);
	return 0;
}

%s区分大小写。

%.1f