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- Question
Functions cannot return more than one value at a time
Options- A. True
- B. False
- Correct Answer
- True
ExplanationTrue, A function cannot return more than one value at a time. because after returning a value the control is given back to calling function.
Functions problems
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- 1. In C all functions except main() can be called recursively.
Options- A. True
- B. False Discuss
Correct Answer: False
Explanation:
Any function including main() can be called recursively.- 2. What will be the output of the program?
#include<stdio.h> #include<stdlib.h> int main() { int i=0; i++; if(i<=5) { printf("CuriousTab"); exit(1); main(); } return 0; }
Options- A. Prints "CuriousTab" 5 times
- B. Function main() doesn't calls itself
- C. Infinite loop
- D. Prints "CuriousTab" Discuss
Correct Answer: Prints "CuriousTab"
Explanation:
Step 1: int i=0; The variable i is declared as in integer type and initialized to '0'(zero).Step 2: i++; Here variable i is increemented by 1. Hence i becomes '1'(one).
Step 3: if(i<=5) becomes if(1 <=5). Hence the if condition is satisfied and it enter into if block statements.
Step 4: printf("CuriousTab"); It prints "CuriousTab".
Step 5: exit(1); This exit statement terminates the program execution.
Hence the output is "CuriousTab".
- 3. What will be the output of the program?
#include<stdio.h> int check(int); int main() { int i=45, c; c = check(i); printf("%d\n", c); return 0; } int check(int ch) { if(ch >= 45) return 100; else return 10; }
Options- A. 100
- B. 10
- C. 1
- D. 0 Discuss
Correct Answer: 100
Explanation:
Step 1: int check(int); This prototype tells the compiler that the function check() accepts one integer parameter and returns an integer value.Step 2: int l=45, c; The variable i and c are declared as an integer type and i is initialized to 45.
The function check(i) return 100 if the given value of variable i is >=(greater than or equal to) 45, else it will return 10.
Step 3: c = check(i); becomes c = check(45); The function check() return 100 and it get stored in the variable c.(c = 100)
Step 4: printf("%d\n", c); It prints the value of variable c.
Hence the output of the program is '100'.
- 4. What will be the output of the program?
#include<stdio.h> int check (int, int); int main() { int c; c = check(10, 20); printf("c=%d\n", c); return 0; } int check(int i, int j) { int *p, *q; p=&i; q=&j; i>=45? return(*p): return(*q); }
Options- A. Print 10
- B. Print 20
- C. Print 1
- D. Compile error Discuss
Correct Answer: Compile error
Explanation:
There is an error in this line i>=45 ? return(*p): return(*q);. We cannot use return keyword in the terenary operators.- 5. What will be the output of the program?
#include<stdio.h> void fun(int); typedef int (*pf) (int, int); int proc(pf, int, int); int main() { int a=3; fun(a); return 0; } void fun(int n) { if(n > 0) { fun(--n); printf("%d,", n); fun(--n); } }
Options- A. 0, 2, 1, 0,
- B. 1, 1, 2, 0,
- C. 0, 1, 0, 2,
- D. 0, 1, 2, 0, Discuss
Correct Answer: 0, 1, 2, 0,
- 6. A function cannot be defined inside another function
Options- A. True
- B. False Discuss
Correct Answer: True
Explanation:
A function cannot be defined inside the another function, but a function can be called inside a another function.- 7. If return type for a function is not specified, it defaults to int
Options- A. True
- B. False Discuss
Correct Answer: True
Explanation:
True, The default return type for a function is int.- 8. A function may have any number of return statements each returning different values.
Options- A. True
- B. False Discuss
Correct Answer: True
Explanation:
True, A function may have any number of return statements each returning different values and each return statements will not occur successively.- 9. Functions can be called either by value or reference
Options- A. True
- B. False Discuss
Correct Answer: True
Explanation:
True, A function can be called either call by value or call by reference.Example:
Call by value means c = sub(a, b); here value of a and b are passed.
Call by reference means c = sub(&a, &b); here address of a and b are passed.
- 10. Names of functions in two different files linked together must be unique
Options- A. True
- B. False Discuss
Correct Answer: True
Explanation:
True, If two function are declared in a same name, it gives "Error: Multiple declaration of function_name())".
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