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- Question
Point out the error, if any in the program.
#include<stdio.h> int main() { int i = 1; switch(i) { case 1: printf("Case1"); break; case 1*2+4: printf("Case2"); break; } return 0; }
Options- A. Error: in case 1*2+4 statement
- B. Error: No default specified
- C. Error: in switch statement
- D. No Error
- Correct Answer
- No Error
ExplanationConstant expression are accepted in switchIt prints "Case1"
Control Instructions problems
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- 1. Point out the error, if any in the program.
#include<stdio.h> int main() { int a = 10, b; a >=5? b=100: b=200; printf("%d\n", b); return 0; }
Options- A. 100
- B. 200
- C. Error: L value required for b
- D. Garbage value Discuss
Correct Answer: Error: L value required for b
Explanation:
Variable b is not assigned.It should be like:
b = a >= 5 ? 100 : 200;- 2. Which of the following errors would be reported by the compiler on compiling the program given below?
#include<stdio.h> int main() { int a = 5; switch(a) { case 1: printf("First"); case 2: printf("Second"); case 3 + 2: printf("Third"); case 5: printf("Final"); break; } return 0; }
Options- A. There is no break statement in each case.
- B. Expression as in case 3 + 2 is not allowed.
- C. Duplicate case case 5:
- D. No error will be reported. Discuss
Correct Answer: Duplicate case case 5:
Explanation:
Because, case 3 + 2: and case 5: have the same constant value 5.- 3. Point out the error, if any in the while loop.
#include<stdio.h> int main() { void fun(); int i = 1; while(i <= 5) { printf("%d\n", i); if(i>2) goto here; } return 0; } void fun() { here: printf("It works"); }
Options- A. No Error: prints "It works"
- B. Error: fun() cannot be accessed
- C. Error: goto cannot takeover control to other function
- D. No error Discuss
Correct Answer: Error: goto cannot takeover control to other function
Explanation:
A label is used as the target of a goto statement, and that label must be within the same function as the goto statement.Syntax: goto <identifier> ;
Control is unconditionally transferred to the location of a local label specified by <identifier>.
Example:
#include <stdio.h> int main() { int i=1; while(i>0) { printf("%d", i++); if(i==5) goto mylabel; } mylabel: return 0; }Output: 1,2,3,4
- 4. Point out the error, if any in the program.
#include<stdio.h> int main() { int i = 1; switch(i) { printf("This is c program."); case 1: printf("Case1"); break; case 2: printf("Case2"); break; } return 0; }
Options- A. Error: No default specified
- B. Error: Invalid printf statement after switch statement
- C. No Error and prints "Case1"
- D. None of above Discuss
Correct Answer: No Error and prints "Case1"
Explanation:
switch(i) becomes switch(1), then the case 1: block is get executed. Hence it prints "Case1".printf("This is c program."); is ignored by the compiler.
Hence there is no error and prints "Case1".
- 5. Point out the error, if any in the while loop.
#include<stdio.h> int main() { int i=1; while() { printf("%d\n", i++); if(i>10) break; } return 0; }
Options- A. There should be a condition in the while loop
- B. There should be at least a semicolon in the while
- C. The while loop should be replaced with for loop.
- D. No error Discuss
Correct Answer: There should be a condition in the while loop
Explanation:
The while() loop must have conditional expression or it shows "Expression syntax" error.Example: while(i > 10){ ... }
- 6. Point out the error, if any in the program.
#include<stdio.h> int main() { int a = 10; switch(a) { } printf("This is c program."); return 0; }
Options- A. Error: No case statement specified
- B. Error: No default specified
- C. No Error
- D. Error: infinite loop occurs Discuss
Correct Answer: No Error
Explanation:
There can exists a switch statement, which has no case.- 7. Which of the following statements are correct about the program?
#include<stdio.h> int main() { int x = 30, y = 40; if(x == y) printf("x is equal to y\n"); else if(x > y) printf("x is greater than y\n"); else if(x < y) printf("x is less than y\n") return 0; }
Options- A. Error: Statement missing
- B. Error: Expression syntax
- C. Error: Lvalue required
- D. Error: Rvalue required Discuss
Correct Answer: Error: Statement missing
Explanation:
This program will result in error "Statement missing ;"printf("x is less than y\n") here ; should be added to the end of this statement.
- 8. Which of the following statements are correct about the below program?
#include<stdio.h> int main() { int n = 0, y = 1; y == 1? n=0 : n=1; if(n) printf("Yes\n"); else printf("No\n"); return 0; }
Options- A. Error: Declaration terminated incorrectly
- B. Error: Syntax error
- C. Error: Lvalue required
- D. None of above Discuss
Correct Answer: Error: Lvalue required
- 9. Which of the following statements are correct about the below program?
#include<stdio.h> int main() { int i = 10, j = 15; if(i % 2 = j % 3) printf("CuriousTab\n"); return 0; }
Options- A. Error: Expression syntax
- B. Error: Lvalue required
- C. Error: Rvalue required
- D. The Code runs successfully Discuss
Correct Answer: Error: Lvalue required
Explanation:
if(i % 2 = j % 3) This statement generates "LValue required error". There is no variable on the left side of the expression to assign (j % 3).- 10. Which of the following statements are correct about the below program?
#include<stdio.h> int main() { int i = 0; i++; if(i <= 5) { printf("CuriousTab\n"); exit(0); main(); } return 0; }
Options- A. The program prints 'CuriousTab' 5 times
- B. The program prints 'CuriousTab' one time
- C. The call to main() after exit() doesn't materialize.
- D. The compiler reports an error since main() cannot call itself. Discuss
Correct Answer: The program prints 'CuriousTab' one time
Explanation:
Step 1: int i = 0; here variable i is declared as an integer type and initialized to '0'(zero).
Step 2: i++; here variable i is increemented by 1(one). Hence, i = 1
Step 3: if(i <= 5) becomes if(1 <= 5) here we are checking '1' is less than or equal to '5'. Hence the if condition is satisfied.
Step 4: printf("CuriousTab\n"); It prints "CuriousTab"
Step 5: exit(); terminates the program execution.
Hence the output is "CuriousTab".
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- 1. Point out the error, if any in the program.