Memset () function in C

The function void * memset (void * str, int c, size_t n) copies the character c (an unsigned char) to the first n characters of the string pointed to by parameter str.

Declare memset () in C

Below is the declaration for memset () in C:

 void * memset ( void * str , int c , size_t n ) 

Parameters

str - This is a pointer to memory block to fill .

c - This is the value to be set. The value is passed as an int, but the memory fill function uses the unsigned char conversion of this value.

n - This is the number of bytes to be set to the value.

Returns the value

This function returns a pointer to memory str.

For example

The following program C illustrates the usage of memset () in C:

 #include #include int main () { char str [ 50 ]; strcpy ( str , "Hoc C co ban va nang cao tai QTM" ); puts ( str ); memset ( str , '$' , 7 ); puts ( str ); return ( 0 ); } 

Compile and run the above C program to see the results.

According to Tutorialspoint

Previous article: memmove function in C

Next lesson: strcat function in C