C Programming and Problem Solving Questions and Answers 41 to 50

C Programming and Problem Solving

Questions 41 to 50



41.
Find the output of the following program:
void   main(){
struct xx
{
int x=3;
char name[]="hello";
};
struct xx *s;
printf("%d",s->x);
printf("%s",
s->name);
}
(a)
3 and hello
(b)
3 and h
(c)
Syntax error
(d)
Runtime error
(e)
3 and garbage.
42.
Find the output of the following program:
void main() {
printf("\nab");
printf("\bsi");
prin
tf("\rha");
}
(a)
absiha
(b)
asiha
(c)
siha
(d)
hai
(e)
ha.
43.
Pick the correct output of the following program
#define square(x) x*x
void main()
{
int i;
i = 64/square(4);
printf("%d",i);
}
(a)
Syntax error
(b)
64
(c)
1/4
(d)
4
(e)
1.
44.
What is the correct output for the following piece of code?
#define a 10
void main() {
#define a 50
printf("%d",a);
}
(a)
10
(b)
Syntax error
(c)
Runtime error
(d)
Garbage value
(e)
50.
45.
The output of the following program is
void main() {
printf("%p", main);
}
(a)
Runtime error
(b)
Syntax error
(c)
Some address will be printed
(d)
main
(e)
Infinitely executed program.
46.
What is the output of the following code part?
enum colors {BLACK,BLUE,GREEN}
void     main()  {
printf("%dà%dà%d",BLACK,BLUE,GREEN);
}
(a)
0à1à2
(b)
1à2à3
(c)
Syntax error
(d)
–1à0à1
(e)
BLACKàBLUEàGREEN.
47.
The output of the following program is
#define f(g,g2) g##g2
void main()               {
int var12=100;
printf("%d",f(var,12));
}
(a)
Syntax error
(b)
Runtime error
(c)
g##g2
(d)
100
(e)
10012.
48.
The output of the following program is
void main( )   {
int a[ ] = {10,20,30,40,50},j,*p;
for(j=0; j<5; j++)   {
printf(“%d” ,*a);
a++;
}
p = a;
for(j=0; j<5; j++) {
printf(“%d ” ,*p);
p++;
}
}
(a)
10,20,30,40,50  10,11,12,13,14
(b)
10,20,30,40,50  11,12,13,14,15
(c)
Syntax error
(d)
Runtime error
(e)
10,20,30,40,50 10,20,30,40,50.
49.
The type of the controlling expression of a switch statement cannot be of the type
(a)
Int
(b)
Char
(c)
Short
(d)
Float
(e)
Long.
50.
What's wrong in the following statement, provided k is a variable of type int? 
for (k = 2, k <=12, k++)
(a)
The increment should always be ++k
(b)
The variable must always be the letter i when using a for loop
(c)
There should be a semicolon at the end of the statement
(d)
The variable k can’t be initialized
(e)
The commas should be semicolons.



Answers



41.
C
You can not initialize members in structure declaration.
42.
D
because of these three characters \n - newline   \b - backspace \r - carriage return.
43.
B
the macro call square(4) will substitute 4*4 at macro call, so the expression becomes i = 64/4*4 . Since / and * has equal priority the expression will be evaluated as (64/4)*4 i.e. 16*4 = 64
44.
E
The preprocessor directives can be redefined anywhere in the program. So the most recently assigned value will be taken with the current scope.
45.
C
Function names are just addresses (just like array names are addresses).
main() is also a function. So the address of function main will be printed. %p in printf specifies that the argument is an address. They are printed as hexadecimal numbers.
46.
A
enum members are get assigned with integer values starting from 0, if not explicitly initialized in declaration.
47.
D
## is token pasting operator which simply combines all the parameters of macro into one variable.
48.
C
Error is in line with statement a++. The operand must be an lvalue and may be of any of scalar type for the any operator, array name only when subscripted is an lvalue. Simply array name is a non-modifiable lvalue.
49.
D
According to the syntax of C programming language.
50.
E
In for loop the three statement parts are separated by two semicolons which are missing here.


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