Point out the error in the program?

#include<stdio.h>

int main()
{
    struct a
    {
        float category:5;
        char scheme:4;
    };
    printf("size=%d", sizeof(struct a));
    return 0;
}

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;
}

The '.' operator can be used access structure elements using a structure variable.

Can we specify a variable filed width in a scanf() format string?

Which header file should be included to use functions like malloc() and calloc()?

If malloc() successfully allocates memory it returns the number of bytes it has allocated.

In a function that receives variable number of arguments the fixed arguments passed to the function can be at the end of argument list.

We can allocate a 2-Dimensional array dynamically.

Are the following declarations same?

char far *far *scr;
char far far** scr;

What is the purpose of fflush() function.