C/stdlib.h/free

free: returns the memory to the heap

<source lang="cpp">

//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;
 }
          
      </source>