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MCQOPTIONS
This section includes 278 Mcqs, each offering curated multiple-choice questions to sharpen your C Interview knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Longevity of a variable refers to |
| A. | The duration for which the variable retains a given value during the execution of a program. |
| B. | The portion of a program in which the variable may be visible. |
| C. | Internal linkage of a variable. |
| D. | External linkage of a variable. |
| Answer» B. The portion of a program in which the variable may be visible. | |
| 152. |
Which variable has the longest scope in the following C code? #include int b; int main() { int c; return 0; } int a; |
| A. | a |
| B. | b |
| C. | c |
| D. | Both a and b |
| Answer» C. c | |
| 153. |
Comment on the output of the following C code.#include int main() { int i; for (i = 0;i < 5; i++) int a = i; printf("%d", a); } |
| A. | a is out of scope when printf is called |
| B. | Redeclaration of a in same scope throws error |
| C. | Syntax error in declaration of a |
| D. | No errors, program will show the output 5 |
| Answer» D. No errors, program will show the output 5 | |
| 154. |
What is the scope of a function? |
| A. | Whole source file in which it is defined |
| B. | From the point of declaration to the end of the file in which it is defined |
| C. | Any source file in a program |
| D. | From the point of declaration to the end of the file being compiled |
| Answer» E. | |
| 155. |
What will be the output of the following C code (without linking the source file in which ary1 is defined)? #include int main() { extern ary1[]; printf("scope rules\n"); } |
| A. | scope rules |
| B. | Linking error due to undefined reference |
| C. | Compile time error because size of array is not provided |
| D. | Compile time error because datatype of array is not provided |
| Answer» B. Linking error due to undefined reference | |
| 156. |
What is the scope of an external variable? |
| A. | Whole source file in which it is defined |
| B. | From the point of declaration to the end of the file in which it is defined |
| C. | Any source file in a program |
| D. | From the point of declaration to the end of the file being compiled |
| Answer» E. | |
| 157. |
What will be the output of the following C code (after linking to source file having definition of ary1)? #include int main() { extern ary1[]; printf("%d\n", ary1[0]); } |
| A. | Value of ary1[0]; |
| B. | Compile time error due to multiple definition |
| C. | Compile time error because size of array is not provided |
| D. | Compile time error because datatype of array is not provided |
| Answer» E. | |
| 158. |
What will be the output of the following C code? #include int i; int main() { extern int i; if (i == 0) printf("scope rules\n"); } |
| A. | scope rules |
| B. | Compile time error due to multiple declaration |
| C. | Compile time error due to not defining type in statement extern i |
| D. | Nothing will be printed as value of i is not zero because i is an automatic variable |
| Answer» B. Compile time error due to multiple declaration | |
| 159. |
What will be the output of the following C code? #include int *i; int main() { if (i == 0) printf("true\n"); return 0; } |
| A. | true |
| B. | true only if NULL value is 0 |
| C. | Compile time error |
| D. | Nothing |
| Answer» C. Compile time error | |
| 160. |
What will be the output of the following C code? #include int *i; int main() { if (i == NULL) printf("true\n"); return 0; } |
| A. | true |
| B. | true only if NULL value is 0 |
| C. | Compile time error |
| D. | Nothing |
| Answer» B. true only if NULL value is 0 | |
| 161. |
Can variable i be accessed by functions in another source file? #include int i; int main() { printf("%d\n", i); } |
| A. | Yes |
| B. | No |
| C. | Only if static keyword is used |
| D. | Depends on the type of the variable |
| Answer» B. No | |
| 162. |
What will be the output of the following C code? #include double i; int main() { printf("%g\n",i); return 0; } |
| A. | 0 |
| B. | 0.000000 |
| C. | Garbage value |
| D. | Depends on the compiler |
| Answer» B. 0.000000 | |
| 163. |
Which part of the program address space is p stored in the following C code? #include int *p; int main() { int i = 0; p = &i; return 0; } |
| A. | Data segment |
| B. | Code/text segment |
| C. | Bss segment |
| D. | Stack |
| Answer» D. Stack | |
| 164. |
What will be the output of the following C code? #include int main() { printf("%d", d++); } int d = 10; |
| A. | 9 |
| B. | 10 |
| C. | 11 |
| D. | Compile time error |
| Answer» E. | |
| 165. |
Which part of the program address space is p stored in the following C code? #include int *p = NULL; int main() { int i = 0; p = &i; return 0; } |
| A. | Code/text segment |
| B. | Data segment |
| C. | Bss segment |
| D. | Stack |
| Answer» C. Bss segment | |
| 166. |
What will be the output of the following C code? #include double var = 8; int main() { int var = 5; printf("%d", var); } |
| A. | 5 |
| B. | 8 |
| C. | Compile time error due to wrong format identifier for double |
| D. | Compile time error due to redeclaration of variable with same name |
| Answer» B. 8 | |
| 167. |
Which of the following is an external variable in the following C code? #include int func (int a) { int b; return b; } int main() { int c; func (c); } int d; |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» E. | |
| 168. |
Global variables are ____________ |
| A. | External |
| B. | Internal |
| C. | Both External and Internal |
| D. | None of the mentioned |
| Answer» B. Internal | |
| 169. |
Functions in C are always _________ |
| A. | Internal |
| B. | External |
| C. | Both Internal and External |
| D. | External and Internal are not valid terms for functions |
| Answer» C. Both Internal and External | |
| 170. |
What will be the output of the following C code? #include int x; void main() { printf("%d", x); } |
| A. | Junk value |
| B. | Run time error |
| C. | 0 |
| D. | Undefined |
| Answer» D. Undefined | |
| 171. |
What will be the output of the following C code? #include int x = 5; void main() { int x = 3; printf("%d", x); { x = 4; } printf("%d", x); } |
| A. | Run time error |
| B. | 3 3 |
| C. | 3 5 |
| D. | 3 4 |
| Answer» E. | |
| 172. |
What will be the output of the following C code? #include int x = 5; void main() { int x = 3; printf("%d", x); { int x = 4; } printf("%d", x); } |
| A. | 3 3 |
| B. | 3 4 |
| C. | 3 5 |
| D. | Run time error |
| Answer» B. 3 4 | |
| 173. |
What will be the output of the following C code? #include void main() { m(); printf("%d", x); } int x; void m() { x = 4; } |
| A. | 4 |
| B. | Compile time error |
| C. | 0 |
| D. | Undefined |
| Answer» C. 0 | |
| 174. |
An external variable is one: |
| A. | Which is globally accessible by all functions |
| B. | Which is declared outside the body of any function |
| C. | Which resides in the memory till the end of a program |
| D. | All of the above |
| Answer» E. | |
| 175. |
What will be the output of the following C code? #include void main() { int x = 0; int *ptr = &5; printf("%p\n", ptr); } |
| A. | 5 |
| B. | Address of 5 |
| C. | Nothing |
| D. | Compile time error |
| Answer» E. | |
| 176. |
Which is an indirection operator among the following? |
| A. | & |
| B. | * |
| C. | -> |
| D. | . |
| Answer» C. -> | |
| 177. |
What will be the output of the following C code? #include void main() { int x = 0; int *ptr = &x; printf("%d\n", *ptr); } |
| A. | Address of x |
| B. | Junk value |
| C. | 0 |
| D. | Run time error |
| Answer» D. Run time error | |
| 178. |
What will be the output of the following C code? #include int x = 0; void main() { int *const ptr = &x; printf("%p\n", ptr); ptr++; printf("%p\n ", ptr); } |
| A. | 0 1 |
| B. | Compile time error |
| C. | 0xbfd605e8 0xbfd605ec |
| D. | 0xbfd605e8 0xbfd605e8 |
| Answer» C. 0xbfd605e8 0xbfd605ec | |
| 179. |
What will be the output of the following C code? #include int x = 0; void main() { int *ptr = &x; printf("%p\n", ptr); x++; printf("%p\n ", ptr); } |
| A. | Same address |
| B. | Different address |
| C. | Compile time error |
| D. | Varies |
| Answer» B. Different address | |
| 180. |
Which of the following does not initialize ptr to null (assuming variable declaration of a as int a=0;)? |
| A. | int *ptr = &a; |
| B. | int *ptr = &a – &a; |
| C. | int *ptr = a – a; |
| D. | All of the mentioned |
| Answer» B. int *ptr = &a – &a; | |
| 181. |
Comment on the following C statement. const int *ptr; |
| A. | You cannot change the value pointed by ptr |
| B. | You cannot change the pointer ptr itself |
| C. | You May or may not change the value pointed by ptr |
| D. | You can change the pointer as well as the value pointed by it |
| Answer» B. You cannot change the pointer ptr itself | |
| 182. |
What will be the output of the following C code? #include int main() { int *ptr, a = 10; ptr = &a; *ptr += 1; printf("%d,%d/n", *ptr, a); } |
| A. | 10,10 |
| B. | 10,11 |
| C. | 11,10 |
| D. | 11,11 |
| Answer» E. | |
| 183. |
What will be the output of the following C code? #include int main() { int i = 10; void *p = &i; printf("%f\n", *(float*)p); return 0; } |
| A. | Compile time error |
| B. | Undefined behaviour |
| C. | 10 |
| D. | 0.000000 |
| Answer» E. | |
| 184. |
What will be the output of the following C code? #include int main() { int i = 10; void *p = &i; printf("%d\n", (int)*p); return 0; } |
| A. | Compile time error |
| B. | Segmentation fault/runtime crash |
| C. | 10 |
| D. | Undefined behaviour |
| Answer» B. Segmentation fault/runtime crash | |
| 185. |
Comment on the following pointer declaration. int *ptr, p; |
| A. | ptr is a pointer to integer, p is not |
| B. | ptr and p, both are pointers to integer |
| C. | ptr is a pointer to integer, p may or may not be |
| D. | ptr and p both are not pointers to integer |
| Answer» B. ptr and p, both are pointers to integer | |
| 186. |
What will be the output of the following C code? #include int *f(); int main() { int *p = f(); printf("%d\n", *p); } int *f() { int *j = (int*)malloc(sizeof(int)); *j = 10; return j; } |
| A. | 10 |
| B. | Compile time error |
| C. | Segmentation fault/runtime crash since pointer to local variable is returned |
| D. | Undefined behaviour |
| Answer» B. Compile time error | |
| 187. |
What will be the output of the program If the integer is 4bytes long? #include int main() { int ***r, **q, *p, i=8; p = &i; q = &p; r = &q; printf("%d, %d, %d\n", *p, **q, ***r); return 0; } |
| A. | 8, 8, 8 |
| B. | 4000, 4002, 4004 |
| C. | 4000, 4004, 4008 |
| D. | 4000, 4008, 4016 |
| Answer» B. 4000, 4002, 4004 | |
| 188. |
What will be the output of the program ? #include int main() { int x=30, *y, *z; y=&x; /* Assume address of x is 500 and integer is 4 byte size */ z=y; *y++=*z++; x++; printf("x=%d, y=%d, z=%d\n", x, y, z); return 0; } |
| A. | x=31, y=502, z=502 |
| B. | x=31, y=500, z=500 |
| C. | x=31, y=498, z=498 |
| D. | x=31, y=504, z=504 |
| Answer» E. | |
| 189. |
What will be the output of the program ? #include int main() { char str[20] = "Hello"; char *const p=str; *p='M'; printf("%s\n", str); return 0; } |
| A. | Mello |
| B. | Hello |
| C. | HMello |
| D. | MHello |
| Answer» B. Hello | |
| 190. |
What will be the output of the program ? #include int main() { int i=3, *j, k; j = &i; printf("%d\n", i**j*i+*j); return 0; } |
| A. | 30 |
| B. | 27 |
| C. | 9 |
| D. | 3 |
| Answer» B. 27 | |
| 191. |
What will be the output of the program ? #include int main() { static char *s[] = {"black", "white", "pink", "violet"}; char **ptr[] = {s+3, s+2, s+1, s}, ***p; p = ptr; ++p; printf("%s", **p+1); return 0; } |
| A. | ink |
| B. | ack |
| C. | ite |
| D. | let |
| Answer» B. ack | |
| 192. |
How many loops are there in C |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 1 |
| Answer» C. 4 | |
| 193. |
What will be the output of the following C code?#include int main() { char *p = NULL; char *q = 0; if (p) printf(" p "); else printf("nullp"); if (q) printf("q\n"); else printf(" nullq\n"); } |
| A. | nullp nullq |
| B. | Depends on the compiler |
| C. | x nullq where x can be p or nullp depending on the value of NULL |
| D. | p q |
| Answer» B. Depends on the compiler | |
| 194. |
What will be the output of the following C code? #include int main() { if (printf("%d", printf("))) printf("We are Happy"); else if (printf("1")) printf("We are Sad"); } |
| A. | 0We are Happy |
| B. | 1We are Happy |
| C. | 1We are Sad |
| D. | compile time error |
| Answer» E. | |
| 195. |
When C Language was invented? |
| A. | 1970 |
| B. | 1972 |
| C. | 1978 |
| D. | 1979 |
| Answer» C. 1978 | |
| 196. |
What will be the output of the following C code? #include int main() { int a = 1; if (a--) printf("True"); if (a++) printf("False"); } |
| A. | True |
| B. | False |
| C. | True False |
| D. | No Output |
| Answer» B. False | |
| 197. |
What will be the output of the following C code? #include int main() { int x = 0; if (x == 1) if (x >= 0) printf("true\n"); else printf("false\n"); } |
| A. | true |
| B. | false |
| C. | Depends on the compiler |
| D. | No print statement |
| Answer» E. | |
| 198. |
What will be the output of the following C code? #include int main() { int a = 1; if (a) printf("All is Well "); printf("I am Well\n"); else printf("I am not a River\n"); } |
| A. | Output will be All is Well I am Well |
| B. | Output will be I am Well I am not a River |
| C. | Output will be I am Well |
| D. | Compile time errors during compilation |
| Answer» E. | |
| 199. |
Which of the following is an invalid if-else statement? |
| A. | if (if (a == 1)){} |
| B. | if (func1 (a)){} |
| C. | if (a){} |
| D. | if ((char) a){} |
| Answer» B. if (func1 (a)){} | |
| 200. |
What will be the output of the following C code? #include int main() { int x = 0; if (x == 0) printf("true, "); else if (x = 10) printf("false, "); printf("%d\n", x); } |
| A. | false, 0 |
| B. | true, 0 |
| C. | true, 10 |
| D. | compile time error |
| Answer» C. true, 10 | |