C Programming Questions and Answers – If-then-else Statements – 1

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This set of C Multiple Choice Questions & Answers (MCQs) focuses on “If-then-else Statements – 1”.

Pre-requisite for this C MCQ set: Advanced C Programming Video Tutorial.

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1. What will be the output of the following C code?

  1.     #include <stdio.h>
  2.     void main()
  3.     {
  4.         int x = 5;
  5.         if (x < 1)
  6.             printf("hello");
  7.         if (x == 5)
  8.             printf("hi");
  9.         else
  10.             printf("no");
  11.     }

a) hi
b) hello
c) no
d) error
View Answer

Answer: a
Explanation: None.
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2. What will be the output of the following C code?

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  1.     #include <stdio.h>
  2.     int x;
  3.     void main()
  4.     {
  5.         if (x)
  6.             printf("hi");
  7.         else
  8.             printf("how are u");
  9.     }

a) hi
b) how are you
c) compile time error
d) error
View Answer

Answer: b
Explanation: None.
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3. What will be the output of the following C code?

  1.     #include <stdio.h>
  2.     void main()
  3.     {
  4.         int x = 5;
  5.         if (true);
  6.             printf("hello");
  7.     }

a) It will display hello
b) It will throw an error
c) Nothing will be displayed
d) Compiler dependent
View Answer

Answer: b
Explanation: None.
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4. What will be the output of the following C code?

  1.     #include <stdio.h>
  2.     void main()
  3.     {
  4.         int x = 0;
  5.         if (x == 0)
  6.             printf("hi");
  7.         else
  8.             printf("how are u");
  9.             printf("hello");
  10.     }

a) hi
b) how are you
c) hello
d) hihello
View Answer

Answer: d
Explanation: None.

5. What will be the output of the following C code?

  1.     #include <stdio.h>
  2.     void main()
  3.     {
  4.         int x = 5;
  5.         if (x < 1);
  6.             printf("Hello");
  7.  
  8.     }

a) Nothing
b) Run time error
c) Hello
d) Varies
View Answer

Answer: c
Explanation: None.

6. What will be the output of the following C code? (Assuming that we have entered the value 1 in the standard input)

  1.     #include <stdio.h>
  2.     void main()
  3.     {
  4.         double ch;
  5.         printf("enter a value between 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
View Answer

Answer: a
Explanation: None.

7. What will be the output of the following C code? (Assuming that we have entered the value 1 in the standard input)

  1.     #include <stdio.h>
  2.     void main()
  3.     {
  4.         char *ch;
  5.         printf("enter a value between 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) 2
c) Compile time error
d) No Compile time error
View Answer

Answer: c
Explanation: None.

8. What will be the output of the following C code? (Assuming that we have entered the value 1 in the standard input)

  1.     #include <stdio.h>
  2.     void main()
  3.     {
  4.         int ch;
  5.         printf("enter a value between 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
View Answer

Answer: c
Explanation: None.

9. What will be the output of the following C code? (Assuming that we have entered the value 2 in the standard input)

  1.     #include <stdio.h>
  2.     void main()
  3.     {
  4.         int ch;
  5.         printf("enter a value between 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
View Answer

Answer: d
Explanation: None.

10. What will be the output of the following C code? (Assuming that we have entered the value 1 in the standard input)

  1.     #include <stdio.h>
  2.     void main()
  3.     {
  4.         int ch;
  5.         printf("enter a value between 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
View Answer

Answer: b
Explanation: None.

Sanfoundry Global Education & Learning Series – C Programming Language.

To practice all areas of C language, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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