型や変数の大きさを表示

明解Ｃ言語入門編 > 7. 基本型 >

C



#include <stdio.h>
int main(int argc, char* argv[])

{

    char                a;

    signed char         b;

    unsigned char       c;
    int                 d;

    signed int          e;

    unsigned            f;

    unsigned int        g;
    short               h;

    short int           i;

    signed short int    j;

    unsigned short      k;

    unsigned short int  l;
    long                m;

    long int            n;

    signed long int     o;

    unsigned long       p;

    unsigned long int   q;
    float               r;

    double              s;

    long double         t;
    bool                w;

    wchar_t             x;
    printf("sizeof(char)                 = %u\n", sizeof(a));

    printf("sizeof(signed char)          = %u\n", sizeof(b));

    printf("sizeof(unsigned char)        = %u\n", sizeof(c));
    printf("sizeof(int)                  = %u\n", sizeof(d));

    printf("sizeof(signed int)           = %u\n", sizeof(e));

    printf("sizeof(unsigned)             = %u\n", sizeof(f));

    printf("sizeof(unsigned int)         = %u\n", sizeof(g));
    printf("sizeof(short)                = %u\n", sizeof(h));

    printf("sizeof(short int)            = %u\n", sizeof(i));

    printf("sizeof(signed short int)     = %u\n", sizeof(j));

    printf("sizeof(unsigned short)       = %u\n", sizeof(k));

    printf("sizeof(unsigned short int)   = %u\n", sizeof(l));
    printf("sizeof(long)                 = %u\n", sizeof(m));

    printf("sizeof(long int)             = %u\n", sizeof(n));

    printf("sizeof(signed long int)      = %u\n", sizeof(o));

    printf("sizeof(unsigned long)        = %u\n", sizeof(p));

    printf("sizeof(unsigned long int)    = %u\n", sizeof(q));
    printf("sizeof(float)                = %u\n", sizeof(r));

    printf("sizeof(double)               = %u\n", sizeof(s));

    printf("sizeof(long double)          = %u\n", sizeof(t));
    printf("sizeof(bool)                 = %u\n", sizeof(w));

    printf("sizeof(wchar_t)              = %u\n", sizeof(x));
    return 0;

}

実行結果



T:\>lesson058\project1.exe

sizeof(char)                 = 1

sizeof(signed char)          = 1

sizeof(unsigned char)        = 1

sizeof(int)                  = 4

sizeof(signed int)           = 4

sizeof(unsigned)             = 4

sizeof(unsigned int)         = 4

sizeof(short)                = 2

sizeof(short int)            = 2

sizeof(signed short int)     = 2

sizeof(unsigned short)       = 2

sizeof(unsigned short int)   = 2

sizeof(long)                 = 4

sizeof(long int)             = 4

sizeof(signed long int)      = 4

sizeof(unsigned long)        = 4

sizeof(unsigned long int)    = 4

sizeof(float)                = 4

sizeof(double)               = 8

sizeof(long double)          = 10

sizeof(bool)                 = 1

sizeof(wchar_t)              = 2