例1： #include <stdio.h>                     
void main()
{
    int a, b, c, d;
    unsigned u;
    a = 10;
    b = -54;
    u = 24;
    c = a + b;
    d = b + u;
    printf("a+b=%d, b+u=%d\n", c, d);
}

例2：

#include <stdio.h>

int main()
{
    int a, b, c, d;
    unsigned u;
    a = 10;
    b = -54;
    u = 24;
    c = a + b;
    d = b + u;
    printf("a+b=%d, b+u=%d\n", c, d);
     return 0;
}

类型说明符                  数的范围          字节数
int                         32                4
unsigned short int          16                2   
short int                   16                2                 
unsigned short int          16                2      
long int                    32                4         
unsigned long               32                4
求出的字节数和范围正确吗？