printf的格式说明符

%c  
打印单个ASCII 字符
printf("The character is %c\n",x)
输出: The character is A
 
%d
打印一个十进制数
printf("The boy is %d years old\n",y)
输出：The boy is 15 years old
 
%e 
打印数字的e 记数法形式
printf("z is %e\n",z) 打印: z is 2.3e+0 1
 
%f 
打印一个浮点数
printf("z is %f\n", 2.3 * 2)
输出: z is 4.600000
 
 
%o 
打印数字的八进制
printf("y is %o\n",y)
输出：z is 17
 
%s 
打印一个字符串
print("The name of the culprit is %s\n",$1)
输出：The name of the culprit is Bob Smith
 
 
%x  打印数字的十六进制值
printf("y is %x\n",y)
输出：x is f