基本数据类型

 数据类型可以表示其在占用内存的大小，当一个数据类型定义了一个变量时，这个变量占用的内存大小与其数据类型一样。

#include<stdio.h>

int main()
{
    char c = 'c';
    printf("sizeof(char)=%d,%d
",sizeof(c),sizeof(char));

    int j=1;
    printf("sizeof(int)=%d,%d
",sizeof(j),sizeof(int));

    float f = 0.78;
    printf("sizeof(float)=%d,%d
",sizeof(f),sizeof(float));

    long l = 89;
    printf("sizeof(long)=%d,%d
",sizeof(l),sizeof(long));

    unsigned int t = 7;
    printf("sizeof(unsigned int)=%d,%d
",sizeof(t),sizeof(unsigned int));

    unsigned long k = 8;
    printf("sizeof(unsigned long)=%d,%d
",sizeof(k),sizeof(unsigned long));

    double d = 1.90;
    printf("sizeof(double)=%d,%d
",sizeof(d),sizeof(double));

    return 0;
}

#include<stdio.h>

typedef int INT32;
typedef unsigned char BYTE;
typedef struct _tag_TS
{
    BYTE b1;
    BYTE b2;
    short s;
    INT32 i;
}TS;

struct _tag_DT
{
    double d;
    float f;
}dt;

//typedef DT struct _tag_DT ;

int main()
{
    INT32 i32;
    BYTE b;
    TS ts;
    //struct DT dt;

    printf("INT32=%d,%d
",sizeof(INT32),sizeof(i32));
    printf("BYTE=%d,%d
",sizeof(BYTE),sizeof(b));
    printf("TS=%d,%d
",sizeof(TS),sizeof(ts));
    printf("_tag_DT=%d,%d
",sizeof(_tag_DT),sizeof(dt));

    return 0;
}