C Tutorial/Language/Variable Size and Limitation — различия между версиями
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Текущая версия на 10:32, 25 мая 2010
Finding the limits
#include <stdio.h>
#include <limits.h>
#include <float.h>
int main(void)
{
printf("Variables of type char store values from %d to %d", CHAR_MIN, CHAR_MAX);
printf("\nVariables of type unsigned char store values from 0 to %u", UCHAR_MAX);
printf("\nVariables of type short store values from %d to %d", SHRT_MIN, SHRT_MAX);
printf("\nVariables of type unsigned short store values from 0 to %u",USHRT_MAX);
printf("\nVariables of type int store values from %d to %d", INT_MIN, INT_MAX);
printf("\nVariables of type unsigned int store values from 0 to %u", UINT_MAX);
printf("\nVariables of type long store values from %ld to %ld", LONG_MIN, LONG_MAX);
printf("\nVariables of type unsigned long store values from 0 to %lu", ULONG_MAX);
printf("\nVariables of type long long store values from %lld to %lld", LLONG_MIN, LLONG_MAX);
printf("\nVariables of type unsigned long long store values from 0 to %llu", ULLONG_MAX);
printf("\n\nThe size of the smallest non-zero value of type float is %.3e", FLT_MIN);
printf("\nThe size of the largest value of type float is %.3e", FLT_MAX);
printf("\nThe size of the smallest non-zero value of type double is %.3e", DBL_MIN);
printf("\nThe size of the largest value of type double is %.3e", DBL_MAX);
printf("\nThe size of the smallest non-zero value of type long double is %.3Le", LDBL_MIN);
printf("\nThe size of the largest value of type long double is %.3Le\n", LDBL_MAX);
printf("\nVariables of type float provide %u decimal digits precision.", FLT_DIG);
printf("\nVariables of type double provide %u decimal digits precision.", DBL_DIG);
printf("\nVariables of type long double provide %u decimal digits precision.", LDBL_DIG);
return 0;
}Variables of type char store values from -128 to 127
Variables of type unsigned char store values from 0 to 255
Variables of type short store values from -32768 to 32767
Variables of type unsigned short store values from 0 to 65535
Variables of type int store values from -2147483648 to 2147483647
Variables of type unsigned int store values from 0 to 4294967295
Variables of type long store values from -2147483648 to 2147483647
Variables of type unsigned long store values from 0 to 4294967295
Variables of type long long store values from -9223372036854775808 to 9223372036854775807
Variables of type unsigned long long store values from 0 to 18446744073709551615
The size of the smallest non-zero value of type float is 1.175e-38
The size of the largest value of type float is 3.403e+38
The size of the smallest non-zero value of type double is 2.225e-308
The size of the largest value of type double is 1.798e+308
The size of the smallest non-zero value of type long double is 3.362e-4932
The size of the largest value of type long double is 1.190e+4932
Variables of type float provide 6 decimal digits precision.
Variables of type double provide 15 decimal digits precision.
Variables of type long double provide 18 decimal digits precision.
Finding the size of a type
#include <stdio.h>
int main(void)
{
printf("\nVariables of type char occupy %d bytes", sizeof(char));
printf("\nVariables of type short occupy %d bytes", sizeof(short));
printf("\nVariables of type int occupy %d bytes", sizeof(int));
printf("\nVariables of type long occupy %d bytes", sizeof(long));
printf("\nVariables of type float occupy %d bytes", sizeof(float));
printf("\nVariables of type double occupy %d bytes", sizeof(double));
printf("\nVariables of type long double occupy %d bytes", sizeof(long double));
return 0;
}Variables of type char occupy 1 bytes
Variables of type short occupy 2 bytes
Variables of type int occupy 4 bytes
Variables of type long occupy 4 bytes
Variables of type float occupy 4 bytes
Variables of type double occupy 8 bytes
Variables of type long double occupy 12 bytes
