C Programming MCQ - Memory Allocation

11. What is the output of this program?

#include <stdio.h>
#include  <stdlib.h>
int main()
{
  int i, numbers[1];
  numbers[0] = 15;
  free(numbers);
  printf("Stored integers are ");
  printf("numbers[%d] = %d ", 0, numbers[0]);
  return 0;
}

A. 15
B. Compilation error
C. 0
D. garbage value

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12. What is the output of this program?

#include <stdio.h>
#include  <stdlib.h>
int main()
{
   int *j = (int*)malloc(4 * sizeof(int));
   *j = 15;
   free(j);
   printf("%d", *j);
   return 0;
}

A. Compilation error
B. Some Garbage value
C. 0
D. Nothing prints

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13. What is the output of this program?

#include <stdio.h>
#include  <stdlib.h>
int main()
{
   int *numbers = (int*)calloc(4, sizeof(int));
   numbers[0] = 2;
   free(numbers);
   printf("Stored integers are ");
   printf("numbers[%d] = %d ", 0, numbers[0]);
   return 0;
}

A. Garbage value
B. 2
C. 0
D. Compilation error

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14. What is the output of this program?

#include <stdio.h>
void main()
{
   int *ptr = (int *)malloc(sizeof(int));
   *ptr = 10;
   free(ptr);
   p = 5;
   printf("%d", ptr);
}

A. Compilation error
B. 5
C. 0
D. Garbage value

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15. What is the output of this program?

#include <stdio.h>
#include  <stdlib.h>
int main()
{
  int i;
  char *ptr;
  char *fun();
  ptr = fun();
  printf(" %s", ptr);
  return 0;
}

char *fun()
{
  char disk[30];
  strcpy(disk, "letsfindcourse");
  printf("%s ",disk);
  return disk;
}

A. letsfindcourse
B. Compilation error
C. letsfindcourse letsfindcourse
D. garbage value

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16. What is the output of this program?

#include <stdio.h>
#include  <stdlib.h>
int main()
{
  int *p;
  p = (int *)malloc(40);
  printf("%d", sizeof(p));
  free(p);
  return 0;
}

A. 40
B. 50
C. 30
D. 20

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17. What is the output of this program?

#include <stdio.h>
#include  <stdlib.h>
int main()
{
  struct test
  {
    int i;
    float f;
    char c;
  };
  struct test *ptr;
  ptr = (struct test *)malloc(sizeof(struct test));
  ptr ->f = 2.5f;
  printf("%f", ptr->f);
  return 0;
}

A. Compilation error
B. 2.5
C. Garbage value
D. 0

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18. Which statment is true about the given code ?

#include <stdio.h>
#include  <stdlib.h>
int main()
{
    int *a[5];
    a = (int*) malloc(sizeof(int)*5);
    free(a);
    return 0;
}

A. Error: unable to allocate memory
B. Error: We cannot store address of allocated memory in a
C. Error: unable to free memory
D. No error

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19. What is the Error of this program?

#include <stdio.h>
#include  <stdlib.h>
int main()

{
     char *ptr;
     *ptr = (char)malloc(30);
     strcpy(ptr, "RAM");
     printf("%s", ptr);
     free(ptr);
     return 0;
}

A. Error: in strcpy() statement.
B. Error: in *ptr = (char)malloc(30);
C. Error: in free(ptr);
D. No error

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20. How will you free the memory allocated by the following program?

#include <stdio.h>
#include  <stdlib.h>
#define MAXROW 2
#define MAXCOL 3
int main()
{
    int **p, i, j;
    p = (int **) malloc(MAXROW * sizeof(int*));
    return 0;
}

A. memfree(int p);
B. dealloc(p);
C. malloc(p, 0);
D. free(p);

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