What is the use of memcpy function in C language

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Memcpy

Function: memory copy

Function prototype:

Void * memcpy (void * dest, const void * src, size_t count)

Use:

Format: memcpy (destination, original, memory size you want to manipulate (in bytes))

Copy the "Parameter 3" byte content starting from "Parameter 2" to "Parameter 1"

The memecpy function is similar to strncpy.

Example:

# include # include # include int main () {int aa [] = {1pr 2pc 3P 4}; int bb [10] = {0}; memcpy (bb, aa, 4 * sizeof (int)); / / copy the contents of 4 bytes (each int type is 4 bytes) in the aa array to the bb array for (int I = 0; I)

< 10; i++) //打印bb数组全部数据 { printf("%d ", bb[i]); } } 最后bb字符串中前4*4个字节的内容被改为aa的内容

Note: memcpy cannot copy overlapping memory.

# include # include # include int main () {int aa [] = {1, 2, 7, 8, 9, 10}; my_memcpy (aa + 2, aa, 24); for (int I = 0; I < 10; iBex +) {printf ("% d", aa [I]);}}

Output:

This problem occurs when copying overlapping memory.

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