1. Comment on the output of this C code?
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#include <stdio.h> -
int main()
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{ -
char *str = "This" //Line 1
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char *ptr = "Programn"; //Line 2
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str = ptr; //Line 3
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printf("%s, %sn", str, ptr); //Line 4
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}
a) Memory holding “this” is cleared at line 3
b) Memory holding “this” loses its reference at line 3
c) You cannot assign pointer like in Line 3
d) Output will be This, Program
Answer
Answer: b [Reason:] None.
2. What type initialization is needed for the segment “ptr[3] = ‘3’;” to work?
a) char *ptr = “Hello!”;
b) char ptr[] = “Hello!”;
c) both char *ptr = “Hello!”; and char ptr[] = “Hello!”;
d) none of the mentioned
Answer
Answer: b [Reason:] None.
3. The syntax for constant pointer to address (i.e., fixed pointer address) is:
a) const <type> * <name>
b) <type> * const <name>
c) <type> const * <name>
d) none of the mentioned
Answer
Answer: b [Reason:] None.
4. Comment on the output of this C code?
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#include <stdio.h> -
int add(int a, int b)
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{ -
return a + b;
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} -
int main()
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{ -
int (*fn_ptr)(int, int);
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fn_ptr = add;
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printf("The sum of two numbers is: %d", (int)fn_ptr(2, 3));
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}
a) Compile time error, declaration of a function inside main
b) Compile time error, no definition of function fn_ptr
c) Compile time error, illegal application of statement fn_ptr = add
d) No Run time error, output is 5
Answer
Answer: d [Reason:] None.
5. The correct way to declare and assign a function pointer is done by:
(Assuming the function to be assigned is “int multi(int, int);”)
a) int (*fn_ptr)(int, int) = multi;
b) int *fn_ptr(int, int) = multi;
c) int *fn_ptr(int, int) = &multi;
d) none of the mentioned
Answer
Answer: a [Reason:] None.
6. Calling a function f with a an array variable a[3] where a is an array, is equivalent to
a) f(a[3])
b) f(*(a + 3))
c) f(3[a])
d) all of the mentioned
Answer
Answer: d [Reason:] None.
7. What is the output of this C code?
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#include <stdio.h> -
void f(char *k)
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{ -
k++; -
k[2] = 'm';
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} -
void main()
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{ -
char s[] = "hello";
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f(s);
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printf("%cn", *s);
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}
a) h
b) e
c) m
d) o;
Answer
Answer: a [Reason:] None.
8.What is the output of this C code?
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#include <stdio.h> -
void main()
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{ -
char s[] = "hello";
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s++; -
printf("%cn", *s);
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}
a) Compile time error
b) h
c) e
d) o
Answer
Answer: a [Reason:] None.
