The function void *memset (void *ptr, int c, size_t n); copies the character c to the first n bytes of the block of memory pointed by ptr.
Function prototype of memset
void *memset (void *ptr, int c, size_t n);
- ptr : This is pointer to the block of memory to fill.
- c : This is the value to be set in first n bytes of block of memory. The value is passed as an int, but the function populates the block of memory using it's character equivalent.
- n : This is the number of bytes to be filled.
Return value of memset
It returns a pointer to the block of memory after populating it.
C program using memset function
The following program shows the use of memset function to fill characters inside string.
#include <stdio.h>
#include <string.h>
int main()
{
char string[100];
printf("Enter a string\n");
gets(string);
memset(string,'*', strlen(string)/2);
printf("String after doing memset\n%s", string);
return(0);
}
Output
Enter a string TechCrashCourse String after doing memset *******shCourse