a. ++ b. -- c. sizeof d. - e. all the above 11. Which of the following is the wrong combination for any two operators in C a. different precedence,

Size: px

Start display at page:

Download "a. ++ b. -- c. sizeof d. - e. all the above 11. Which of the following is the wrong combination for any two operators in C a. different precedence,"

Magdalene Gallagher
5 years ago
Views:

1 UNIT III 1. Which of the following cannot be value of the expression in switch case statement a. integer b. float c. char d. shortint 2. What will happen if we write semicolon after switch statement switch(choice); //proper codes for cases 0 to n and default case a. complete switch block will be ignored by compiler b. will execute the case as per expression c. Syntax error d. none of these 3. Which of the following loop is going to execute at least once a. while b. do-while c. for d. all the above 4. Menu driven programs are usually written using a. for loops b. while loop c. switch case statement d. none of these 5. Whenever break statement is encounter inside any loop then the control is passed to the a. first statement after the loop b. first statement of the loop c. main() function d. none of these 6. Whenever compiler encounters continue statement inside any loop then the control is b. passed to a. beginning of the loop b. end of the loop c. the first statement after the loop d. main() function 7. Which of the following creates infinite loop a. While(;) b. if(;) c. for(;;;) d. none of these 8. Which of the following loop checks the test condition at the end a. for d. while c. do while d. switch 9. The most suitable loop when the number of iterations are known a. for b. while c. do-while d. if 10. Which of the following are unary operators

2 a. ++ b. -- c. sizeof d. - e. all the above 11. Which of the following is the wrong combination for any two operators in C a. different precedence, different associativity b. same precedence, different associativity c. different precedence, same associativity d. same precedence, same associativity 12. Before using pointer variable in C program it should be a. declared b. initialized c. both declared and initialized d. none of these 13. The statement int **ptr; is a. pointer to pointer b. double pointer c. Syntax is correct d. All the above 14. Address stored in the pointer variable is of the type a. float b. integer c. character d. double e. all the above bit compiler will take how many bytes to store address of an integer a. 2 b. 4 c. d. 8 e The operators < and > are meaningful when used with pointers if the a. pointer point to elements of the same array b. pointer point to values of same data type c. pointer point values of different data type d. none of these 17. Comment on the following pointer declaration int *ptr, a; a. both ptr and a are pointer variables b. a is a pointer variable but not ptr c. ptr is a pointer to integer, a is not d. none of these 18. Comment on the following statement const int *p; a. value pointed by p is fixed b. value pointed by p is not fixed c. both a and b depending on the compiler d. none of these

3 int main(void) int i=0,j; for(;i<10;i++); printf("%d\t", i); int main(void) int i=0,j; for(;;) printf("%d\t", i); //Indefinite loop int main(void) int a=10,b=20,c; c=(a,b); //equivalent to c=b; printf("c=%d",c); c=20 int main(void) int a=20,b=10; if(a<b); printf("hello"); int main(void) int a=20,b=10; if(a) printf("hi\n");

4 printf("hello\n"); if(-6) printf("how\n"); printf("are\n"); Hi How Dude if(a-2*b) printf("you\n"); printf("dude\n"); int main(void) int a=20,b=10,c; if(c=a%b) a=40; printf("a=%d, b=%d,c=%d",a,b,c); a=20, b=10,c=0 int main(void) int i=10; for(;i>5;printf("%d\t",--i)); int main(void) int a=200,b=10,c; if((printf("%d",a)) > (printf("%d",b))) printf("hi\n"); printf("hello\n");

5 20010Hi printf() function returns number of characters it is going to print. The first printf() in if condition returns 4 (3 characters in 200 and a new line). The second printf() in if condition returns 3 (2 characters in 10 and a new line). int main(void) int b=20; if(!b<=50) b=60; b=70; printf("b=%d",b); b=60 Negation is having higher precedence than relational operators.!b will become 0. 0<=50. Condition becomes true. So if part executed int main(void) int a=10,b,c; if(a>=50) b=60; c=40; printf("a=%d,b=%d,c=%d",a,b,c); a=10,b=garbage_value,c=40 int main(void) char *ptr; ptr="hi"; printf("%c\t",*ptr); printf("%d\t",*ptr); printf("%c\t",*&*ptr); printf("%d\t",*&*ptr); H 72 H 72 Why only H, why not Hi? Why 72 Think

6 int main(void) int a=1; int *ptr=&a; a=a+1; int main(void) int a=1; int *ptr=&a; ptr++; int main(void) int a=1; int *ptr=&2; ptr++; int main(void) float a=4.5; switch (a) case 4: printf("hi"); case 5: printf("hello");

7 default: printf("invalidchoice\n"); switch quantity not an integer int main(void) int a=4; switch (a) case 4: printf("hi\t"); case 5: printf("hello\t"); case 6: printf("how Are You\t"); case 7: printf("i am fine\t"); default: printf("invalid Choice\n"); Hi Hello How Are You int main(void) int a=4,b,c=2; switch (a, c, b=a+c+1) case 4: printf("hi\t"); case 5: printf("hello\t"); case 6: printf("how Are You\t"); case 7: printf("i am fine\t"); default: printf("invalid Choice\n"); I am fine int main(void) int a=10; while()

8 printf("hi\n"); Compilation error. Condition is compulsory in while. int main(void) int a=10, c=1; while(a++, c=a+1, c<12, c<16) printf("a=%d c=%d\n",a,c); a=11 c=12 a=12 c=13 a=13 c=14 a=14 c=15 int main(void) int a=10; while(printf("hello")) printf("a=%d\t",++a); Infinite Loop Answer Key 1 B A B C A

9 6 A C C A E B C D B A A C A

First of all, it is a variable, just like other variables you studied

Pointers: Basics What is a pointer? First of all, it is a variable, just like other variables you studied So it has type, storage etc. Difference: it can only store the address (rather than the value)