C / C++程序查找int，float，double和char的大小

给定四种类型的变量，即int，char，float和double，任务是用C或C++编写程序以查找这四种类型的变量的大小。

例子：

Input: int
Output: Size of int = 4

Input: double
Output: Size of double = 8

以下是所有数据类型及其大小，范围和访问说明符的列表：

Data Type	Memory (bytes)	Range	Format Specifier
short int	2	-32,768 to 32,767	%hd
unsigned short int	2	0 to 65,535	%hu
unsigned int	4	0 to 4,294,967,295	%u
int	4	-2,147,483,648 to 2,147,483,647	%d
long int	4	-2,147,483,648 to 2,147,483,647	%ld
unsigned long int	4	0 to 4,294,967,295	%lu
long long int	8	-(2^63) to (2^63)-1	%lld
unsigned long long int	8	0 to 18,446,744,073,709,551,615	%llu
signed char	1	-128 to 127	%c
unsigned char	1	0 to 255	%c
float	4		%f
double	8		%lf
long double	12		%Lf

查找四个变量的大小：

1. 四种类型的变量在integerType，floatType，doubleType和charType中定义。
2. 变量的大小是使用sizeof()运算符计算的。

下面是C和C++程序，用于查找int，char，float和double数据类型的大小：

C

// C program to find the size of int, char,
// float and double data types
  
#include 
  
int main()
{
    int integerType;
    char charType;
    float floatType;
    double doubleType;
  
    // Calculate and Print
    // the size of integer type
    printf("Size of int is: %ld\n",
           sizeof(integerType));
  
    // Calculate and Print
    // the size of charType
    printf("Size of char is: %ld\n",
           sizeof(charType));
  
    // Calculate and Print
    // the size of floatType
    printf("Size of float is: %ld\n",
           sizeof(floatType));
  
    // Calculate and Print
    // the size of doubleType
    printf("Size of double is: %ld\n",
           sizeof(doubleType));
  
    return 0;
}

C++

// C++ program to find the size of int, char,
// float and double data types
#include 
using namespace std;
  
int main() 
{ 
    int integerType; 
    char charType; 
    float floatType; 
    double doubleType; 
  
    // Calculate and Print 
    // the size of integer type 
    cout << "Size of int is: " << 
    sizeof(integerType) <<"\n"; 
  
    // Calculate and Print 
    // the size of doubleType 
    cout << "Size of char is: " << 
    sizeof(charType) <<"\n"; 
      
    // Calculate and Print 
    // the size of charType 
    cout << "Size of float is: " << 
    sizeof(floatType) <<"\n";
  
    // Calculate and Print 
    // the size of floatType 
    cout << "Size of double is: " << 
    sizeof(doubleType) <<"\n"; 
  
    return 0; 
}

输出：

Size of int is: 4
Size of char is: 1
Size of float is: 4
Size of double is: 8

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