| 类型 | 字节大小 | 值范围 |
|---|
| char | 1 | -128 ~ 127 |
| unsigned char | 1 | 0 ~ 255 |
| short | 2 | -32768 ~ 32767 |
| unsigned short | 2 | 0 ~ 65535 |
| int | 4 | -2147483648 ~ 2147483647 |
| unsigned int | 4 | 0 ~ 4294967295 |
| long | 4 | -2147483648 ~ 2147483647 |
| unsigned long | 4 | 0 ~ 4294967295 |
| long long | 8 | -9223372036854775808 ~ 9223372036854775807 |
| unsigned long long | 8 | 0 ~ 18446744073709551615 |
| 类型 | 字节大小 | 值范围 | 精度有效位数 |
|---|
| float | 4 | 1.175494E-038 ~ 3.402823E+038 | 6 |
| double | 8 | 2.225074E-308 ~1.797693E+308 | 15 |
| long double | 16 | 3.172905E-317 ~ 3.172897E-317 | 18 |
测试代码
#include <stdio.h>
#include <limits.h>
#include <float.h>
int main()
{
printf("char 占用字节%d 值范围 %d - %u\n", sizeof(char), CHAR_MIN, CHAR_MAX);
printf("unsigned char 占用字节%d 值范围 %d - %u\n\n", sizeof(unsigned char), 0, UCHAR_MAX);
printf("short 占用字节%d 值范围 %d - %u\n", sizeof(short), SHRT_MIN, SHRT_MAX);
printf("unsigned short 占用字节%d 值范围 %d - %u\n\n", sizeof(unsigned short), 0, USHRT_MAX);
printf("int 占用字节%d 值范围 %d - %u\n", sizeof(int), INT_MIN, INT_MAX);
printf("unsigned int 占用字节%d 值范围 %d - %u\n\n", sizeof(unsigned int), 0, UINT_MAX);
printf("long 占用字节%d 值范围 %d - %u\n", sizeof(long), LONG_MIN, LONG_MAX);
printf("unsigned long 占用字节%d 值范围 %d - %lu\n\n", sizeof(unsigned long), 0, ULONG_MAX);
printf("long long 占用字节%d 值范围 %lld - %llu\n", sizeof(long long), LLONG_MIN, LLONG_MAX);
printf("unsigned long long 占用字节%d 值范围 %d - %llu\n\n", sizeof(unsigned long long), 0, ULLONG_MAX);
printf("float 占用字节%d 值范围 %E - %E 精度为%d\n", sizeof(float), FLT_MIN, FLT_MAX, FLT_DIG);
printf("double 占用字节%d 值范围 %E - %E 精度为%d\n", sizeof(double), DBL_MIN, DBL_MAX, DBL_DIG);
printf("long double 占用字节%d 值范围 %E - %E 精度为%d\n\n", sizeof(long double), LDBL_MIN, LDBL_MAX, LDBL_DIG);
}
