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This article mainly shows you "what is the use of memcpy function in C language", the content is easy to understand, clear, hope to help you solve doubts, the following let Xiaobian lead you to study and learn "what is the use of memcpy function in C language" this article.

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)

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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