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memset in C++
In this section we will see what is the purpose of memset() function in C++. This function converts the value of a character to unsigned character and copies it into each of first n character of the object pointed by the given str[]. If the n is larger than string size, it will be undefined.
The syntax of the memset() function
void* memset( void* str, int c, size_t n);
In this example will use one string, then convert each character to some other character up to length n.
Example
#include<bits/stdc++.h>
using namespace std;
int main() {
char str[] = "Hello World";
memset(str, 'o', 6); //take n = 6
cout << str;
}Output
ooooooWorld
The memset() can be uses to set all values to 0 or -1. But we cannot use some other values, because memset() works byte by byte.
Example
#include<bits/stdc++.h>
using namespace std;
int main() {
int array[10];
memset(array, 0, sizeof(array));
for(int i = 0; i<10; i++){ cout << array[i] << " "; }
cout << endl;
memset(array, -1, sizeof(array));
for(int i = 0; i<10; i++){ cout << array[i] << " "; }
cout << endl;
memset(array, 3, sizeof(array));
for(int i = 0; i<10; i++){ cout << array[i] << " "; }
cout << endl;
}Output
0 0 0 0 0 0 0 0 0 0 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 50529027 50529027 50529027 50529027 50529027 50529027 50529027 50529027 50529027 50529027
Updated on: 30-Jul-2019
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