Aptitude questions and answers in c
Aptitude
questions in interview
Total question: 32
Time: 60 minute
Total marks: 64
1. Find out the error if any, in the program.
#include
int main(){
int i=1;
switch(i){
case 1: printf("\radioactive cats have 18 half-lives");
break;
case 1*2+4: printf("\bottle for rent -inquire within");
break;
}
return 0;
}
2. Find out the error, if any, in the following program.
#include
int main(){
int a=10,b;
a= 5 ? b=100 : b=200;
printf("\n%d",b);
return 0;
}
3. In the following code, in which order the functions would be called?
a= f1(23,14)*f2(12/4)+f3();
a) f1, f2, f3
b) f3, f2, f1
c) The order may vary from compiler to compiler
d) None of the above
4. What would be the output of the following program?
#include
int main(){
int i=4;
switch(i){
default:
printf("\n A mouse is an elephant built by the Japanese");
case 1:
printf(" Breeding rabbits is a hair raising experience");
break;
case 2:
printf("\n Friction is a drag");
break;
case 3:
printf("\n If practice make perfect, then no body's perfect");
}
return 0;
}
a) A mouse is an elephant built by the Japanese
b) Breeding rabbits is a hare raising experience
c) All of the above
d) None of the above
5. What is the output of the following program?
#include
#define SQR(x) (x*x)
int main(){
int a,b=3;
a= SQR(b+2);
printf("%d",a);
return 0;
}
a) 25
b) 11
c) error
d) garbage value
6. In which line of the following, an error would be reported?
#include
1. #define CIRCUM(R) (3.14*R*R);
2. int main()
3. {
4. float r=1.0,c;
5. c= CIRCUM(r);
6. printf("\n%f",c);
7. if(CIRCUM(r))==6.28)
8. printf("\nGobbledygook");
9. return 0;
10. }
a) line 1
b) line 5
c) line 6
d)line 7
7. What is the type of the variable b in the following declaration?
#define FLOATPTR float*
FLOATPTR a,b;
a) float
b) float pointer
c) int
d) int pointer
8. In the following code:
#include"stdio.h";
int main(){
FILE *fp;
fp= fopen("trial","r");
}
fp points to:
a) The first character in the file.
b) A structure which contains a "char" pointer which points to the first character in the file.
c) The name of the file.
d) None of the above.
9. We should not read after a write to a file without an intervening call to fflush(), fseek() or rewind() "TRUE/FALSE" ?
10. If the program (myprog) is run from the command line as myprog 1 2 3 , What would be the output?
#include
int main(int argc, char *argv[]){
int i;
for(i=0;i<argc;i++)
printf("%s",argv[i]);
return 0;
}
a) 1 2 3
b) C:\MYPROG.EXE 1 2 3
c) MYP
d) None of the above
11. If the following program (myprog) is run from the command line as myprog 1 2 3, what would be the output?
#include
int main(int argc, char *argv[]){
int i,j=0;
for(i=0;i<argc;i++)
j=j+ atoi(argv[i]);
printf("%d",j);
return 0;
}
a) 1 2 3
b) 6
c) error
d) "123"
12. If the following program (myprog) is run from the command line as :
myprog monday tuesday wednesday thursday
What would be the output?
#include
int main(int argc, char *argv[]){
while(--argc <0)
printf("%s",*++argv);
return 0;
}
a) myprog monday tuesday wednesday thursday
b) monday tuesday wednesday thursday
c) myprog tuesday thursday
d) None of the above
13. In the following code, is p2 an integer or an integer pointer?
typedef int* ptr
ptr p1,p2;
14. Point out the error in the following program
#include
int main(){
const int x;
x=128;
printf("%d",x);
return 0;
}
15. What would be the output of the following program?
#include
int main(){
int y=128;
const int x=y;
printf("%d",x);
return 0;
}
a) 128
b) Garbage value
c) Error
d) 0
16. What is the difference between the following declarations?
const char *s;
char const *s;
17. What is the difference between the following declarations?
const char *const s;
char const *const s;
18. What would be the output of the following program?
#include
int main(){
char near * near *ptr1;
char near * far *ptr2;
char near * huge *ptr3;
printf("%d %d %d",sizeof(ptr1),sizeof(ptr2),sizeof(ptr3));
return 0;
}
a) 1 1 1
b) 1 2 4
c) 2 4 4
d) 4 4 4
19. If the following program (myprog) is run from the command line as:
myprog friday tuesday Sunday
What would be the output?
#include
int main(int argc, char*argv[]){
printf("%c",**++argv);
return 0;
}
a) m
b) f
c) myprog
d) friday
20. If the following program (myprog) is run from the command line as:
myprog friday tuesday sunday
What would be the output?
#include
int main(int argc, char *argv[]){
printf("%c",*++argv[1]);
return 0;
}
a) r
b) f
c) m
d) y
21. If the following program (myprog) is run from the command line as:
myprog friday tuesday sunday
What would be the output?
#include
int main(int argc, char *argv[]){
while(sizeof argv)
printf("%s",argv[--sizeof argv]);
return 0;
}
a) myprog friday tuesday sunday
b) myprog friday tuesday
c) sunday tuesday friday myprog
d) sunday tuesday friday
22. Find out the error in the following program.
#include
int main(){
int a=10;
void f();
a=f();
printf("\n%d",a);
return 0;
}
void f(){
printf("\nHi");
}
23. In the following program how would you print 50 using p?
#include
int main(){
int a[]={10, 20, 30, 40, 50};
char *p;
p= (char*) a;
}
24. Would the following program compile?
#include
int main(){
int a=10,*j;
void *k;
j=k=&a;
j++;
k++;
printf("\n%u%u",j,k);
}
a) Yes
b) No, the format is incorrect
c) No, the arithmetic operation is not permitted on void pointers
d) No, the arithmetic operation is not permitted on pointers
25. According to ANSI specifications which is the correct way of declaring main() when it receives command line arguments?
a) main(int argc, char *argv[])
b)
main(argc,argv)
int argc;
char *argv[];
c)
main(){
int argc; char *argv[];
}
d) None of the above
26. What error would the following function give on compilation?
f(int a, int b){
int a;
a=20;
return a;
}
a) Missing parenthesis in the return statement
b) The function should be declared as int f(int a, int )
c) Re declaration of a
d) None of the above
27. Find out the error in the following program.
#include
int main(){
const char *fun();
*fun()='A';
return 0;
}
const char *fun(){
return "Hello";
}
28. What would be the output of the following program?
#include
int main(){
const int x=5;
int *ptrx;
ptrx=&x;
*ptrx=10;
printf("%d",x);
return 0;
}
a) 5
b) 10
c) Error
d) Garbage value
29. A switch statement cannot include
a) Constants as arguments
b) Constant expression as arguments
c) String as an argument
d) None of the above
30. How long the following program will run?
#include
int main(){
printf("\nSonata Software");
main();
return 0;
}
a) Infinite loop
b) Until the stack overflows
c) All of the above
d) None of the above
31. On combining the following statements, you will get
char*p;
p=malloc(100);
a) char *p= malloc(100)
b) p= (char*)malloc(100)
c) All of the above
d) None of the above
32. What is the output of the following program?
#include
int main(){
int n=5;
printf("\nn=%*d",n,n);
return 0;
}
a) n=5
b) n=5
c) n= 5
d) Error
Solutions to the above Questions:
1. No error. Constant expression like 1*2+4 is acceptable in cases of a switch.
2. Lvalue required in function main(). The second assignment should be written in parenthesis as follows:
a= 5 ? b = 100 : (b=200);
3. c) The order may vary from compiler to compiler
4. c) All of the above
5. b) 11
6. d)line 7
7. a) float
8. b) A structure which contains a "char" pointer which points to the first character in the file.
9. True
10. b) C:\MYPROG.EXE 1 2 3
11. b) 6
12. b) monday tuesday wednesday Thursday
13. Integer pointer
14. x should have been initialized where it is declared.
15. a) 128
16. No difference
17. No difference
18. c) 2 4 4
19. b) f
20. b) f
21. c) sunday tuesday friday myprog
22. The program is trying to collect the value of a "void" function into an integer variable.
23. printf("\n%d",*((int*)p+4));
24. c) No, the arithmetic operation is not permitted on void pointers
25. a) main(int argc, char *argv[])
26. c) Re declaration of a
27. fun() returns to a "const char" pointer which cannot be modified
28. b) 10
29. c) string as an argument
30. b) Until the stack overflows
31. a) char *p= malloc(100)
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