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C/C++ learning Directory >> C language basics

An introduction to sizeof

In C, the char string is also an important data type. We can use strlen to get the length of a string, and sizeof to get the length of a string.

String: Usually use a pair of double quotation marks""A bracketed string of characters to represent a string constant, which defaults to escape characters'\ 0'At the end, string constants are not modifiable;

sizeofThe function scans the entire string until it hits the first string terminator'\ 0', and then returns the counter value (length includes'\ 0');

/* * Description: * [in] s: string * * Return value: Returns the length of string s, note that the returned length includes \0 */ int sizeof(char *s);Copy the code

Note:strlenThe returned length is not included'\ 0', so when getting the string length,strlenThe function returns a value less than one byte;

Sizeof function

/ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * / / / @ Author: programming ape said // @blog (personal Blog address): www.codersrc.com // @file :C language tutorial - C language sizeof function // @time :2021/06/02 08:00 // @motto: a thousand miles without a step, a small stream without a river or sea, the wonderful life of the program needs unremitting accumulation! /******************************************************************************************/ #include "stdafx.h" #include<stdlib.h> #include<stdio.h> void main() { char p[] = "www.codersrc.com"; Printf (" string: %s Length: %d\n", p, sizeof(p)); char p1[] = "www"; Printf (" string: %s Length: %d\n", p1, sizeof(p1)); char p2[] = "0123456789"; Printf (" string: %s Length: %d\n", p2, sizeof(p2)); system("pause"); } Output: string: www.codersrc.com Length: 17 String: WWW length: 4 String: 0123456789 Length: 11 Press any key to continue..Copy the code

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C language sizeof function

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