When using sizeof and strlen to find the size and length of an array when the pointer points to different positions, analyze the position pointed by the pointer at this time and the meaning of the formula in order to deepen the understanding of arrays and pointers. Table of Contents Foreword: 1. One-dimensional array and […]
Tag: sizeof
The difference between sizeof and strlen
1 The difference between sizeof and strlen 1. sizeof is an operator that does not need to reference the header file. The form is generally sizeof (variable or expression), and it calculates the occupied space. The units are bytes, so it can calculate the size of any type; 2. strlen is a string function and […]
The difference between sizeof and strlen
1. The difference between sizeof and strlen sizeof is a keyword, and the parameters can be various data (including functions, types, objects, arrays, pointers…) used to calculate the byte size of the data. strlen is a function. The parameter type must be a character pointer (char *). It is used to calculate strings. It starts […]
[QandA C++] Summary of key knowledge such as sizeof, strlen, static, extern, typedef, const, #define, inline functions, etc.
Table of Contents The difference between sizeof and strlen static extern “C” typedef const #defineMacro definition Comparison of constants defined by const and #define inline function The difference between inline functions and #define The difference between sizeof and strlen sizeof is an operator and strlen is a library function. The parameters of sizeof can be […]
Byte alignment, sizeof, strlen, _countof, offsetof, _msize
一、sizeof The return value of sizeof() is best saved with size_t. Under x86 and x64, this type has different representations, unsigned int (32 bits), unsigned __int64 (64-bit) #include <iostream> #include <string> #include <vector> int main() { int arrx[20]; auto n = _countof(arrx); //n = 20, the return value type is unsigned int. The macro _countf […]
[Table] P1217 [USACO1.5] Palindromes Prime Palindromes (stringstream, sizeof(num)/sizeof(num[0]))…
Question description Because 151 is both a prime number and a palindrome (looking the same from left to right and right to left), 151 is a palindrome prime number. Write a program to find all palindromic prime numbers in the range [a,b](5≤a
Different array parameters have different meanings in sizeof and strlen
Table of Contents Basic understanding of array parameter passing Basic understanding of sizeof and strlen sizeof operator: strlen function: Notice: sizeof and int type array Code: Code analysis: sizeof and character array Code 1, char arr[]={0}: Code analysis: Code 2, char arr[] = ” “: Code analysis: strlen and character array Code 1, char arr[]={0}: […]
Analysis of sizeof and strlen to obtain arrays and pointers
Table of Contents sizeof Vs strlen in one-dimensional array integer array sizeof character array sizeof strlen string array sizeof strlen String pointer char *p sizeof strlen sizeof in two-dimensional array Summarize The main questions today are mainly array & pointer analysis questions and written test questions. I feel a little anxious recently. Everyone must focus […]
What is the difference between sizeof and strlen, and what is the difference between sizeof(a) and sizeof(a+0)? sizeof(*a), sizeof(a+1), sizeof(a[1])… | Written test question analysis | Super complete
After experiencing array, pointer, pointer array, array pointer…, we really It is difficult to clearly understand what the relationship between them is. Below, the editor will use a written test question to clearly explain sizeof and Different types of calculation scenarios in >strlenand how to use them. 1. Essential knowledge points We first need to […]
Sizeof and strlen explained
Article directory sizeof operator Example 2 Example 3 strlen library function sizeof operator 1.sizeof operator is used to calculate the memory size of variables, the unit is bytes 2. You can also directly calculate the data type to find the number of bytes. We use examples to learn sizeof First we need to understand two […]