C/stdlib.h/free
free: returns the memory to the heap
//Declaration: void free(void *ptr);
#include <stdlib.h>
#include <stdio.h>
int main(void)
{
char *str[100];
int i;
for(i=0; i<100; i++) {
if((str[i] = malloc(128))==NULL) {
printf("Allocation Error\n");
exit(1);
}
gets(str[i]);
}
/* now free the memory */
for(i=0; i<100; i++){
free(str[i]);
}
return 0;
}