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- Question
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
- Correct Answer
- Error: Statement missing
ExplanationThis program will result in error "Statement missing ;"printf("x is less than y\n") here ; should be added to the end of this statement.
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; 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.- 2. 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 Discuss
Correct Answer: No Error
Explanation:
Constant expression are accepted in switchIt prints "Case1"
- 3. 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;- 4. 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.- 5. 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
- 6. 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
- 7. 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).- 8. 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".
- 9. Which of the following statements are correct about the below C-program?
#include<stdio.h> int main() { int x = 10, y = 100%90, i; for(i=1; i<10; i++) if(x != y); printf("x = %d y = %d\n", x, y); return 0; }1 : The printf() function is called 10 times. 2 : The program will produce the output x = 10 y = 10 3 : The ; after the if(x!=y) will NOT produce an error. 4 : The program will not produce output.
Options- A. 1
- B. 2, 3
- C. 3, 4
- D. 4 Discuss
Correct Answer: 2, 3
- 10. Which of the following statements are correct about the below program?
#include<stdio.h> int main() { int i = 10, j = 20; if(i = 5) && if(j = 10) printf("Have a nice day"); return 0; }
Options- A. Output: Have a nice day
- B. No output
- C. Error: Expression syntax
- D. Error: Undeclared identifier if Discuss
Correct Answer: Error: Expression syntax
Explanation:
"Expression syntax" error occur in this line if(i = 5) && if(j = 10).It should be like if((i == 5) && (j == 10)).
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- 1. Point out the error, if any in the program.