C Programming Questions and Answers on Switch Statements for Freshers

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https://www.computersprofessor.com/2017/11/c-programming-questions-and-answers-on_27.html
1. What is the output of this C code(when 1 is entered)?

  1.     #include 
  2.     void main()
  3.     {
  4.         double ch;
  5.         printf("enter a value btw 1 to 2:");
  6.         scanf("%lf", &ch);
  7.         switch (ch)
  8.         {
  9.         case 1:
  10.             printf("1");
  11.             break;
  12.         case 2:
  13.             printf("2");
  14.             break;
  15.         }
  16.     }
a) Compile time error
b) 1
c) 2
d) Varies
Answer: a
2. What is the output of this C code(When 1 is entered)?
  1.     #include 
  2.     void main()
  3.     {
  4.         char *ch;
  5.         printf("enter a value btw 1 to 3:");
  6.         scanf("%s", ch);
  7.         switch (ch)
  8.         {
  9.         case "1":
  10.             printf("1");
  11.             break;
  12.         case "2":
  13.             printf("2");
  14.             break;
  15.         }
  16.     }
a) 1
b) Compile time error
c) 2
d) Run time error
Answer: b
3. What is the output of this C code(When 1 is entered)?
  1.     #include 
  2.     void main()
  3.     {
  4.         int ch;
  5.         printf("enter a value btw 1 to 2:");
  6.         scanf("%d", &ch);
  7.         switch (ch)
  8.         {
  9.         case 1:
  10.             printf("1\n");
  11.         default:
  12.             printf("2\n");
  13.         }
  14.     }
a) 1
b) 2
c) 1 2
d) Run time error
Answer: c
4. What is the output of this C code(When 2 is entered)?

  1.     #include 
  2.     void main()
  3.     {
  4.         int ch;
  5.         printf("enter a value btw 1 to 2:");
  6.         scanf("%d", &ch);
  7.         switch (ch)
  8.         {
  9.         case 1:
  10.             printf("1\n");
  11.             break;
  12.             printf("hi");
  13.         default:
  14.             printf("2\n");
  15.         }
  16.     }
a) 1
b) hi 2
c) Run time error
d) 2
Answer: d
5. What is the output of this C code(When 1 is entered)?
  1.     #include 
  2.     void main()
  3.     {
  4.         int ch;
  5.         printf("enter a value btw 1 to 2:");
  6.         scanf("%d", &ch);
  7.         switch (ch, ch + 1)
  8.         {
  9.         case 1:
  10.             printf("1\n");
  11.             break;
  12.         case 2:
  13.             printf("2");
  14.             break;
  15.         }
  16.     }
a) 1
b) 2
c) 3
d) Run time error
Answer: b
6. What is the output of this C code?
  1.     #include 
  2.     int main()
  3.     {
  4.         int a = 1, b = 1;
  5.         switch (a)
  6.         {
  7.         case a*b:
  8.             printf("yes ");
  9.         case a-b:
  10.             printf("no\n");
  11.             break;
  12.         }
  13.     }
a) yes
b) no
c) Compile time error
d) yes no
Answer: c
7. What is the output of this C code?

  1.     #include 
  2.     int main()
  3.     {
  4.         int x = 97;
  5.         switch (x)
  6.         {
  7.         case 'a':
  8.             printf("yes ");
  9.             break;
  10.         case 97:
  11.             printf("no\n");
  12.             break;
  13.         }
  14.     }
a) yes
b) yes no
c) Duplicate case value error
d) Character case value error
Answer: c

8. What is the output of this C code?

  1.     #include 
  2.     int main()
  3.     {
  4.         float f = 1;
  5.         switch (f)
  6.         {
  7.         case 1.0:
  8.             printf("yes\n");
  9.             break;
  10.         default:
  11.             printf("default\n");
  12.         }
  13.     }
a) yes
b) yes default
c) Undefined behaviour
d) Compile time error
Answer: d
9. What is the output of this C code?
  1.     #include 
  2.     const int a = 1,  b = 2;
  3.     int main()
  4.     {
  5.         int x = 1;
  6.         switch (x)
  7.         {
  8.         case a:
  9.             printf("yes ");
  10.         case b:
  11.             printf("no\n");
  12.             break;
  13.         }
  14.     }
a) yes no
b) yes
c) no
d) Compile time error
Answer: d
10. What is the output of this C code?
  1.     #include 
  2.     #define max(a) a
  3.     int main()
  4.     {
  5.         int x = 1;
  6.         switch (x)
  7.         {
  8.         case max(2):
  9.             printf("yes\n");
  10.         case max(1):
  11.             printf("no\n");
  12.             break;
  13.         }
  14.     }
a) yes no
b) yes
c) no
d) Compile time error
Answer: c
11. What is the output of this C code?
  1.     #include 
  2.     int main()
  3.     {
  4.         switch (printf("Do"))
  5.         {
  6.         case 1:
  7.             printf("First\n");
  8.             break;
  9.         case 2:
  10.             printf("Second\n");
  11.             break;
  12.         default:
  13.             printf("Default\n");
  14.             break;
  15.         }
  16.     }
a) Do
b) DoFirst
c) DoSecond
d) DoDefault
Answer: c
12. Comment on the output of this C code?
  1.     #include 
  2.     int main()
  3.     {
  4.         int a = 1;
  5.         switch (a)
  6.         case 1:
  7.             printf("%d", a);
  8.         case 2:
  9.             printf("%d", a);
  10.         case 3:
  11.             printf("%d", a);
  12.         default:
  13.             printf("%d", a);
  14.     }
a) No error, output is 1111
b) No error, output is 1
c) Compile time error, no break statements
d) Compile time error, case label outside switch statement
Answer: d
13. Switch statement accepts.

a) int
b) char
c) long
d) all of the mentioned
Answer: d
14. Comment on the output of this C code?
  1.     #include 
  2.     int main()
  3.     {
  4.         int a = 1;
  5.         switch (a)
  6.         {
  7.         case a:
  8.             printf("Case A ");
  9.         default:
  10.             printf("Default");
  11.         }
  12.     }
a) Output: Case A
b) Output: Default
c) Output: Case A Default
d) Compile time error
Answer: d
15. Comment on the output of this C code?
  1.     #include 
  2.     switch (ch)
  3.     {
  4.     case 'a':
  5.     case 'A':
  6.         printf("true");
  7.     }
a) if (ch == ‘a’ && ch == ‘A’) printf(“true”);
b) if (ch == ‘a’)
    if (ch == ‘a’) printf(“true”);
c) if (ch == ‘a’ || ch == ‘A’) printf(“true”);
d) none of the mentioned
Answer: c

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