头文件 <limits.h>和<float.h>中说明了基础数据的长度。 float，double和long double的范围就是在IEEE 754标准中提及的典型数据。
关键字 | 位长(字节) | 范围 | 格式化字符串 |
|---|---|---|---|
char | 1 | -128..127（或0..255，与体系结构相关） | %c |
unsigned char | 1 | 0..255 | |
signed char | 1 | -128..127 | |
int | 2(16位系统) 或 4 | -32768..32767 或 -2147483648..2147483647 | %i, %d |
unsigned int | 2 或 4 | 0..65535 或 0..4294967295 | %u |
signed int | 2 或 4 | -32768..32767 或 -2147483648..2147483647 | %i, %d |
short int | 2 | -32768..32767 | %hi |
unsigned short | 2 | 0..65535 | %hu |
signed short | 2 | -32768..32767 | |
long int | 4 或 8[3] | -2147483648..2147483647 或 -9223372036854775808..9223372036854775807 | %li, %ld |
unsigned long | 4 或 8 | 0..4294967295 或 0..18446744073709551615 | %lu |
signed long | 4 或 8 | -2147483648..2147483647 或 -9223372036854775808..9223372036854775807 | |
long long | 8 | -9223372036854775808..9223372036854775807 | %lli |
unsigned long long | 8 | 0..18446744073709551615 | %llu |
float | 4 | 3.4x10-38..3.4x10 38 (7 sf) | %f, %e, %g |
double | 8 | 1.7x10-308..1.7x10 308 (15 sf) | %f, %e, %g |
long double | 8 或以上 | 编译器相关 | %Lf, %Le, %Lg |
