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Dev-C++下关于几种int类型格式符的实验

2005-03-10 21:46 549 查看
kingwei 2005.3.10

实验环境: Dev-C++ 4.9.6.0 (gcc/mingw32), 使用-Wall编译选项
#include <stdio.h>
int main()
{
int v_int;
signed int v_signed_int;
unsigned int v_unsigned_int;
signed short int v_signed_short_int;
unsigned short int v_unsigned_short_int;
signed long int v_signed_long_int;
unsigned long int v_unsigned_long_int;

freopen("intuex.txt", "r", stdin);
freopen("out.txt", "w", stdout);

/* [-2^31, 2^31-1] ==> [-2147483648, 2147483647] */
scanf("%d", &v_int);
printf("%d/n", v_int);

/* [-2^31, 2^31-1] ==> [-2147483648, 2147483647] */
scanf("%d", &v_signed_int);
printf("%d/n", v_signed_int);

/* [0, 2^32-1] ==> [0, 4294967295] */
scanf("%u", &v_unsigned_int);
printf("%u/n", v_unsigned_int);

/* [-2^15, 2^15-1] ==> [-32768, 32767] */
scanf("%hd", &v_signed_short_int);
printf("%hd/n", v_signed_short_int);

/* [0, 2^32-1] ==> [0, 65535] */
scanf("%hu", &v_unsigned_short_int);
printf("%hu/n", v_unsigned_short_int);

/* [-2^31, 2^31-1] ==> [-2147483648, 2147483647] */
scanf("%ld", &v_signed_long_int);
printf("%ld/n", v_signed_long_int);

/* [0, 2^32-1] ==> [0, 4294967295] */
scanf("%lu", &v_unsigned_long_int);
printf("%lu/n", v_unsigned_long_int);
return 0;
}

测试样例及输出:

----- test case #1: 下界 -----
-2147483648
-2147483648
0
-32768
0
-2147483648
0
output:
-2147483648
-2147483648
0
-32768
0
-2147483648
0
----- test case #2: 上界 -----
2147483647
2147483647
4294967295
32767
65535
2147483647
4294967295
output:
2147483647
2147483647
4294967295
32767
65535
2147483647
4294967295
----- test case #3: 下溢 -----
-2147483649
-2147483649
-1
-32769
-1
-2147483649
-1
output:
2147483647
2147483647
4294967295
32767
65535
2147483647
4294967295
----- test case #4: 上溢 -----
2147483648
2147483648
4294967296
32768
65536
2147483648
4294967296
output:
-2147483648
-2147483648
0
-32768
0
-2147483648
0
可以看到,输入数据下溢,成为该类型所能表示范围的上界;输入数据上溢,成为该类型所能表示范围的下界.
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