C Programming - Const

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Exercise

Find Output of Program
Point Out Errors

"We cannot solve our problems with the same thinking we used when we created them."

- Albert Einstein

Point out the error in the program.

#include<stdio.h>
#define MAX 128

int main()
{
    char mybuf[] = "India";
    char yourbuf[] = "BIX";
    char *const ptr = mybuf;
    *ptr = 'a';
    ptr = yourbuf;
    return 0;
}

A.	Error: unknown pointer conversion
B.	Error: cannot convert ptr const value
C.	No error
D.	None of above

Point out the error in the program (in Turbo-C).

#include<stdio.h>
#define MAX 128

int main()
{
    const int max=128;
    char array[max];
    char string[MAX];
    array[0] = string[0] = 'A';
    printf("%c %c\n", array[0], string[0]);
    return 0;
}

A.	Error: unknown max in declaration/Constant expression required
B.	Error: invalid array string
C.	None of above
D.	No error. It prints A A

Point out the error in 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", e1.name);    
    e1.age=85;
    printf("%d", e1.age);
    printf("%f", e1.salary);
    return 0;
}

A.	Error: RValue required
B.	Error: cannot modify const object
C.	Error: LValue required in strcpy
D.	No error

Point out the error in the program.

#include<stdio.h>
const char *fun();

int main()
{
    char *ptr = fun();
    return 0;
}
const char *fun()
{
    return "Hello";
}

A.	Error: Lvalue required
B.	Error: cannot convert 'const char ' to 'char '.
C.	No error and No output
D.	None of above

Point out the error in the program.

#include<stdio.h>

int main()
{
    const int x;
    x=128;
    printf("%d\n", x);
    return 0;
}

A.	Error: unknown data type const int
B.	Error: const variable have been initialised when declared.
C.	Error: stack overflow in x
D.	No error