C Programming Questions and Answers on While Loops for Freshers

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1. What is the output of this C code?

  1.     #include 
  2.     int main()
  3.     {
  4.         while ()
  5.             printf("In while loop ");
  6.         printf("After loop\n");
  7.     }
a) In while loop after loop
b) After loop
c) Compile time error
d) Infinite loop
Answer: c
2. What is the output of this C code?

  1.     #include 
  2.     int main()
  3.     {
  4.         do
  5.             printf("In while loop ");
  6.         while (0);
  7.             printf("After loop\n");
  8.     }
a) In while loop
b) In while loop
after loop
c) After loop
d) Infinite loop
Answer: b
3. What is the output of this C code?

  1.     #include 
  2.     int main()
  3.     {
  4.         int i = 0;
  5.         do {
  6.             i++;
  7.             printf("In while loop\n");
  8.         } while (i < 3);
  9.     }
a) In while loop
In while loop
In while loop
b) In while loop
In while loop
c) Depends on the compiler
d) Compile time error
Answer: a
4. How many times i value is checked in the below code?
  1.     #include 
  2.     int main()
  3.     {
  4.         int i = 0;
  5.         do {
  6.             i++;
  7.             printf("in while loop\n");
  8.         } while (i < 3);
  9.     }
a) 2
b) 3
c) 4
d) 1
Answer: b
5. How many times i value is checked in the below code?
  1.     #include 
  2.     int main()
  3.     {
  4.         int i = 0;
  5.         while (i < 3)
  6.             i++;
  7.         printf("In while loop\n");
  8.     }
a) 2
b) 3
c) 4
d) 1
Answer: c
6. What is the output of this C code?
  1.     #include 
  2.     void main()
  3.     {
  4.         int i = 2;
  5.         do
  6.         {
  7.             printf("Hi");
  8.         } while (i < 2)
  9.     }
a) Compile time error
b) Hi Hi
c) Hi
d) Varies
Answer: a
7. What is the output of this C code?
  1.     #include 
  2.     void main()
  3.     {
  4.         int i = 0;
  5.         while (++i)
  6.         {
  7.             printf("H");
  8.         }
  9.     }
a) H
b) H is printed infinite times
c) Compile time error
d) Varies
Answer: b
8. What is the output of this C code?

  1.     #include 
  2.     void main()
  3.     {
  4.         int i = 0;
  5.         do
  6.         {
  7.             printf("Hello");
  8.         } while (i != 0);
  9.     }
a) Nothing
b) H is printed infinite times
c) Hello
d) Run time error
Answer: c
9. What is the output of this C code?

  1.     #include 
  2.     void main()
  3.     {
  4.         char *str = "";
  5.         do
  6.         {
  7.             printf("hello");
  8.         } while (str);
  9.     }
a) Nothing
b) Run time error
c) Varies
d) Hello is printed infinite times
Answer: d
10. What is the output of this C code?
  1. #include 
  2. void main()
  3. {
  4.     int i = 0;
  5.     while (i < 10)
  6.     {
  7.         i++;
  8.         printf("hi\n");
  9.         while (i < 8) 
  10.         {
  11.             i++;
  12.             printf("hello\n");
  13.         }
  14.     }
  15. }
a) Hi is printed 8 times, hello 7 times and then hi 2 times
b) Hi is printed 10 times, hello 7 times
c) Hi is printed once, hello 7 times
d) Hi is printed once, hello 7 times and then hi 2 times
Answer: d
11. Example of iteration in C.

a) for
b) while
c) do-while
d) all of the mentioned
Answer: d
12. Number of times while loop condition is tested is, i is initialized to 0 in both case.

  1. while (i < n)
  2.          i++;
  3.     ————-
  4.     do
  5.          i++;
  6.     while (i <= n);
a) n, n
b) n, n+1
c) n+1, n
d) n+1, n+1
Answer: d
13. What is the output of this C code?

  1.     #include 
  2.     int main()
  3.     {
  4.         int i = 0;
  5.         while (i = 0)
  6.             printf("True\n");
  7.         printf("False\n");
  8.     }
a) True (infinite time)
b) True (1 time) False
c) False
d) Compiler dependent
Answer: c
14. What is the output of this C code?
  1.     #include 
  2.     int main()
  3.     {
  4.         int i = 0, j = 0;
  5.         while (i < 5, j < 10)
  6.         {
  7.             i++;
  8.             j++;
  9.         }
  10.         printf("%d, %d\n", i, j);
  11.     }
a) 5, 5
b) 5, 10
c) 10, 10
d) Syntax error
Answer: c
15. Which loop is most suitable to first perform the operation and then test the condition?

a) for loop
b) while loop
c) do-while loop
d) none of the mentioned
Answer: c
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