malloc c++ example
#include <iostream>
#include <cstdlib>
using namespace std;
int main()
{
int *ptr;
ptr = (int*) malloc(5*sizeof(int));
if(!ptr)
{
cout << "Memory Allocation Failed";
exit(1);
}
cout << "Initializing values..." << endl << endl;
for (int i=0; i<5; i++)
{
ptr[i] = i*2+1;
}
cout << "Initialized values" << endl;
for (int i=0; i<5; i++)
{
/* ptr[i] and *(ptr+i) can be used interchangeably */
cout << *(ptr+i) << endl;
}
free(ptr);
return 0;
}malloc in c
#include <stdlib.h>
void *malloc(size_t size);
void exemple(void)
{
char *string;
string = malloc(sizeof(char) * 5);
if (string == NULL)
return;
string[0] = 'H';
string[1] = 'e';
string[2] = 'y';
string[3] = '!';
string[4] = '\0';
printf("%s\n", string);
free(string);
}
/// output : "Hey!"malloc() in c and c++
/* malloc example: random string generator*/
#include <stdio.h> /* printf, scanf, NULL */
#include <stdlib.h> /* malloc, free, rand */
int main ()
{
int i,n;
char * buffer;
printf ("How long do you want the string? ");
scanf ("%d", &i);
buffer = (char*) malloc (i+1);
if (buffer==NULL) exit (1);
for (n=0; n<i; n++)
buffer[n]=rand()%26+'a';
buffer[i]='\0';
printf ("Random string: %s\n",buffer);
free (buffer);
return 0;
}malloc c
int main(int argc, char *argv[])
{
int* memoireAllouee = NULL;
memoireAllouee = malloc(sizeof(int));
if (memoireAllouee == NULL) // Si l'allocation a échoué
{
exit(0); // On arrête immédiatement le programme
}
// On peut continuer le programme normalement sinon
return 0;
}how to use malloc in c
ptr = (castType*) malloc(size);Copyright © 2021 Codeinu
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