4098420
Question 1
Question
What is the output of following program?
# include <stdio.h>
void fun(int x)
{
x = 30;
}
int main()
{
int y = 20;
fun(y);
printf("%d", y);
return 0;
}
Answer
-
30
-
20
-
Error
Question 2
Question
Output of following program?
# include <stdio.h>
void fun(int *ptr)
{
*ptr = 30;
}
int main()
{
int y = 20;
fun(&y);
printf("%d", y);
return 0;
}
Answer
-
20
-
30
-
Error
Question 3
Question
Output of following program?
#include <stdio.h>
int main()
{
int *ptr;
int x;
ptr = &x;
*ptr = 0;
printf(" x = %d\n", x);
printf(" *ptr = %d\n", *ptr);
*ptr += 5;
printf(" x = %d\n", x);
printf(" *ptr = %d\n", *ptr);
(*ptr)++;
printf(" x = %d\n", x);
printf(" *ptr = %d\n", *ptr);
return 0;
}
Answer
-
x = 0 *ptr = 0 x = 5 *ptr = 5 x = 6 *ptr = 6
-
x = garbage value *ptr = 0 x = garbage value *ptr = 5 x = garbage value *ptr = 6
-
x = 0 *ptr = 0 x = 5 *ptr = 5 x = garbage value *ptr = garbage value
Question 4
Question
Consider a compiler where int takes 4 bytes, char takes 1 byte and pointer takes 4 bytes.
#include <stdio.h>
int main()
{
int arri[] = {1, 2 ,3};
int *ptri = arri;
char arrc[] = {1, 2 ,3};
char *ptrc = arrc;
printf("sizeof arri[] = %d ", sizeof(arri));
printf("sizeof ptri = %d ", sizeof(ptri));
printf("sizeof arrc[] = %d ", sizeof(arrc));
printf("sizeof ptrc = %d ", sizeof(ptrc));
return 0;
}
Answer
-
sizeof arri[] = 3 sizeof ptri = 4 sizeof arrc[] = 3 sizeof ptrc = 4
-
sizeof arri[] = 12 sizeof ptri = 4 sizeof arrc[] = 3 sizeof ptrc = 1
-
sizeof arri[] = 12 sizeof ptri = 4 sizeof arrc[] = 3 sizeof ptrc = 4
Question 5
Question
Assume that float takes 4 bytes, predict the output of following program.
#include <stdio.h>
int main()
{
float arr[5] = {12.5, 10.0, 13.5, 90.5, 0.5};
float *ptr1 = &arr[0];
float *ptr2 = ptr1 + 3;
printf("%f ", *ptr2);
printf("%d", ptr2 - ptr1);
return 0;
}
Answer
-
90.500000 3
-
90.500000 12
-
10.000000 12
Question 6
Question
#include<stdio.h>
int main()
{
int arr[] = {10, 20, 30, 40, 50, 60};
int *ptr1 = arr;
int *ptr2 = arr + 5;
printf("Number of elements between two pointer are: %d.",
(ptr2 - ptr1));
printf("Number of bytes between two pointers are: %d",
(char*)ptr2 - (char*) ptr1);
return 0;
}
Answer
-
Number of elements between two pointer are: 5. Number of bytes between two pointers are: 20
-
Number of elements between two pointer are: 20. Number of bytes between two pointers are: 20
-
Number of elements between two pointer are: 5. Number of bytes between two pointers are: 5
Question 7
Question
#include<stdio.h>
int main()
{
int a;
char *x;
x = (char *) &a;
a = 512;
x[0] = 1;
x[1] = 2;
printf("%d\n",a);
return 0;
}
Answer
-
Machine dependent
-
513
-
258
Question 8
Question
int main()
{
char *ptr = "GeeksQuiz";
printf("%c\n", *&*&*ptr);
return 0;
}
Answer
-
Garbage Value
-
Runtime Error
-
G
Question 9
Question
#include<stdio.h>
void f(int *p, int *q)
{
p = q;
*p = 2;
}
int i = 0, j = 1;
int main()
{
f(&i, &j);
printf("%d %d \n", i, j);
getchar();
return 0;
}
Answer
-
2 2
-
0 1
-
0 2
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