C Programming Questions and Answers on Basics of Functions for Freshers
https://www.computersprofessor.com/2017/12/c-programming-questions-and-answers-on_2.html
1. What is the output of this C code?
#includeint main()
{void foo();
printf("1 ");
foo();
}void foo()
{printf("2 ");
}
a) 1 2
b) Compile time error
c) 1 2 1 2
d) Depends on the compiler
b) Compile time error
c) 1 2 1 2
d) Depends on the compiler
Answer: a
2. What is the output of this C code?
#includeint main()
{void foo(), f();
f();
}void foo()
{printf("2 ");
}void f()
{printf("1 ");
foo();
}
a) Compile time error as foo is local to main
b) 1 2
c) 2 1
d) Compile time error due to declaration of functions inside main
b) 1 2
c) 2 1
d) Compile time error due to declaration of functions inside main
Answer: b
3. What is the output of this C code?
#includeint main()
{void foo();
void f()
{foo();
}f();
}void foo()
{printf("2 ");
}
a) 2 2
b) 2
c) Compile time error
d) Depends on the compiler
b) 2
c) Compile time error
d) Depends on the compiler
Answer: d
Explanation: Even though the answer is 2, this code will compile fine only with gcc. GNU C supports nesting of functions in C as a language extension where as standard C compiler doesn’t.
4. What is the output of this C code?
#includevoid foo();
int main()
{void foo();
foo();
return 0;
}void foo()
{printf("2 ");
}
a) Compile time error
b) 2
c) Depends on the compiler
d) Depends on the standard
b) 2
c) Depends on the compiler
d) Depends on the standard
Answer: b
5. What is the output of this C code?
#includevoid foo();
int main()
{void foo(int);
foo(1);
return 0;
}void foo(int i)
{printf("2 ");
}
a) 2
b) Compile time error
c) Depends on the compiler
d) Depends on the standard
b) Compile time error
c) Depends on the compiler
d) Depends on the standard
Answer: a
6. What is the output of this C code?
#includevoid foo();
int main()
{void foo(int);
foo();
return 0;
}void foo()
{printf("2 ");
}
a) 2
b) Compile time error
c) Depends on the compiler
d) Depends on the standard
b) Compile time error
c) Depends on the compiler
d) Depends on the standard
Answer: b
7. What is the output of this C code?
include <stdio.h>
void m()
{printf("hi");
}void main()
{m();
}
a) hi
b) Run time error
c) Nothing
d) Varies
b) Run time error
c) Nothing
d) Varies
Answer: a
8. What is the output of this C code?
#includevoid m();
void n()
{m();
}void main()
{void m()
{printf("hi");
}}
a) hi
b) Compile time error
c) Nothing
d) Varies
b) Compile time error
c) Nothing
d) Varies
Answer: b
9. What is the output of this C code?
#includevoid main()
{m();
void m()
{printf("hi");
}}
a) hi
b) Compile time error
c) Nothing
d) Varies
b) Compile time error
c) Nothing
d) Varies
Answer: b
10. What is the output of this C code?
#includevoid main()
{m();
}void m()
{printf("hi");
m();
}
a) Compile time error
b) hi
c) Infinite hi
d) Nothing
b) hi
c) Infinite hi
d) Nothing
Answer: c
11. What is the output of this C code?
#includevoid main()
{static int x = 3;
x++;if (x <= 5)
{printf("hi");
main();
}}
a) Run time error
b) hi
c) Infinite hi
d) hi hi
b) hi
c) Infinite hi
d) hi hi
Answer: d
12. Which of the following is a correct format for declaration of function?
a) return-type function-name(argument type);
b) return-type function-name(argument type)
{}
c) return-type (argument type)function-name;
d) all of the mentioned
Answer: a
13. Which of the following function declaration is illegal?
a) int 1bhk(int);
b) int 1bhk(int a);
c) int 2bhk(int*, int []);
d) all of the mentioned
Answer: d
14. Which function definition will run correctly?
a) int sum(int a, int b)
return (a + b);
b) int sum(int a, int b)
{return (a + b);}
c) int sum(a, b)
return (a + b);
d) none of the mentioned
Answer: b
15. Can we use a function as a parameter of another function? [ Eg: void wow(int func()) ].
a) Yes, and we can use the function value conveniently
b) Yes, but we call the function again to get the value, not as convenient as in using variable
c) No, C does not support it
d) This case is compiler dependent
Answer: c
16. The value obtained in the function is given back to main by using ________ keyword?
a) return
b) static
c) new
d) volatile
Answer: a
