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Const Questions And Answers.

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Exercise :: Const
1.What will be the output of the program?
#include<stdio.h>

int main()
{
    int y=128;
    const int x=y;
    printf("%d\n", x);
    return 0;
}
A. 128
B. Garbage value
C. Error
D. 0
2.What will be the output of the program ?
#include<stdio.h>
#include<stdlib.h>

union employee
{
    char name[15];
    int age;
    float salary;
};
const union employee e1;

int main()
{
    strcpy(e1.name, "K");
    printf("%s %d %f", e1.name, e1.age, e1.salary);
    return 0;
}
A. Error: RValue required
B. Error: LValue required in strcpy
C. Error: cannot convert from 'const int *' to 'int *const'
D. No Error
3.What will be the output of the program?
#include<stdio.h>
int fun(int **ptr);

int main()
{
    int i=10;
    const int *ptr = &i;
    fun(&ptr);
    return 0;
}
int fun(int **ptr)
{
    int j = 223;
    int *temp = &j;
    printf("Before changing ptr = %5x\n", *ptr);
    const *ptr = temp;
    printf("After changing ptr = %5x\n", *ptr);
    return 0;
}
A. Address of i Address of j
B. 10 223
C. Garbage Value
D. Error: cannot convert parameter 1 from 'const int **' to 'int **'
4.What will be the output of the program?
#include<stdio.h>
int main()
{
    const int x=5;
    const int *ptrx;
    ptrx = &x;
    *ptrx = 10;
    printf("%d\n", x);
    return 0;
}
A. 5
B. 10
C. Garbage Value
D. Error
5.What will be the output of the program?
int fun(int **ptr);

int main()
{
    int i=10, j=20;
    const int *ptr = &i;
    printf(" i = %5X", ptr);
    printf(" ptr = %d", *ptr);
    ptr = &j;
    printf(" j = %5X", ptr);
    printf(" ptr = %d", *ptr);
    return 0;
}
A. i= FFE2 ptr=12 j=FFE4 ptr=24
B. i= FFE4 ptr=10 j=FFE2 ptr=20
C. i= FFE0 ptr=20 j=FFE1 ptr=30
D. Garbage value