Exercise: Structures Unions Enums

Questions for: Structures Unions Enums

Point out the error in the program? 
#include<stdio.h>

int main()
{
    union a
    {
        int i;
        char ch[2];
    };
    union a z1 = {512};
    union a z2 = {0, 2};
    return 0;
}
A:
Error: invalid union declaration
B:
Error: in Initializing z2
C:
No error
D:
None of above
Answer: B
No answer description is available. Let's discuss.
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Point out the error in the program in 16-bit platform? 
#include<stdio.h>

int main()
{
    struct bits
    {
        int i:40;
    }bit;

    printf("%d\n", sizeof(bit));
    return 0;
}
A:
4
B:
2
C:
Error: Bit field too large
D:
Error: Invalid member access in structure
Answer: C
No answer description is available. Let's discuss.
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Point out the error in the program? 
#include<stdio.h>
#include<string.h>
void modify(struct emp*);
struct emp
{
    char name[20];
    int age;
};
int main()
{
    struct emp e = {"Sanjay", 35};
    modify(&e);
    printf("%s %d", e.name, e.age);
    return 0;
}
void modify(struct emp *p)
{
     p ->age=p->age+2;
}
A:
Error: in structure
B:
Error: in prototype declaration unknown struct emp
C:
No error
D:
None of above
Answer: B
The struct emp is mentioned in the prototype of the function modify() before declaring the structure.To solve this problem declare struct emp before the modify() prototype.
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Point out the error in the program? 
#include<stdio.h>

int main()
{
    struct emp
    {
        char name[20];
        float sal;
    };
    struct emp e[10];
    int i;
    for(i=0; i<=9; i++)
        scanf("%s %f", e[i].name, &e[i].sal);
    return 0;
}
A:
Error: invalid structure member
B:
Error: Floating point formats not linked
C:
No error
D:
None of above
Answer: B

At run time it will show an error then program will be terminated.

Sample output: Turbo C (Windows)

c:\>myprogram
                                                          
Sample
12.123

scanf : floating point formats not linked 
Abnormal program termination

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Point out the error in the program? 
struct emp
{
    int ecode;
    struct emp e;
};
A:
Error: in structure declaration
B:
Linker Error
C:
No Error
D:
None of above
Answer: A
The structure emp contains a member e of the same type.(i.e) struct emp. At this stage compiler does not know the size of sttructure.
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