C INTERVIEW QUESTIONS : 2

Which of the following statements are correct about the program? #include 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; }

A. Error: Statement missing B. Error: Expression syntax C. Error: Lvalue required D. Error: Rvalue required Answer: Option A Explanation: This program will result in error "Statement missing ;" printf("x is less than y\n") here ; is added to the end of this statement. Learn more problems on : Control Instructions Discuss about this problem : Discuss in Forum

2.	The modulus operator cannot be used with a long double.
	A. True B. False Answer: Option A Explanation: fmod(x,y) - Calculates x modulo y, the remainder of x/y.  This function is the same as the modulus operator. But fmod() performs floating point orlong double divisions. Learn more problems on : Control Instructions Discuss about this problem : Discuss in Forum

3.

Which of the following correctly shows the hierarchy of arithmetic operations in C?

A. / + * - B. * - / + C. + - / * D. / * + - Answer: Option D Explanation: Simply called as BODMAS (Bracket of Division, Multiplication, Addition and Subtraction). How Do I Remember ? BODMAS ! B - Brackets first O - Orders (ie Powers and Square Roots, etc.) DM - Division and Multiplication (left-to-right) AS - Addition and Subtraction (left-to-right) Learn more problems on : Expressions Discuss about this problem : Discuss in Forum

4.	What will be the output of the program? #include int main() { void fun(char*); char a[100]; a[0] = 'A'; a[1] = 'B'; a[2] = 'C'; a[3] = 'D'; fun(&a[0]); return 0; } void fun(char *a) { a++; printf("%c", *a); a++; printf("%c", *a); }
	A. AB B. BC C. CD D. No output Answer: Option B Learn more problems on : Functions Discuss about this problem : Discuss in Forum

5.	If the size of integer is 4bytes. What will be the output of the program? #include int main() { int arr[] = {12, 13, 14, 15, 16}; printf("%d, %d, %d\n", sizeof(arr), sizeof(*arr), sizeof(arr[0])); return 0; }
	A. 10, 2, 4 B. 20, 4, 4 C. 16, 2, 2 D. 20, 2, 2 Answer: Option B Learn more problems on : Pointers Discuss about this problem : Discuss in Forum

6.	What will be the output of the program ? #include int main() { printf(5+"Good Morning\n"); return 0; }
	A. Good Morning B. Good C. M D. Morning Answer: Option D Explanation: printf(5+"Good Morning\n"); It skips the 5 characters and prints the given string. Hence the output is "Morning" Learn more problems on : Strings Discuss about this problem : Discuss in Forum

7.

What will be the output of the program If characters 'a', 'b' and 'c' enter are supplied as input? #include int main() { void fun(); fun(); printf("\n"); return 0; } void fun() { char c; if((c = getchar())!= '\n') fun(); printf("%c", c); }

A. abc abc B. bca C. Infinite loop D. cba Answer: Option D Explanation: Step 1: void fun(); This is the prototype for the function fun(). Step 2: fun(); The function fun() is called here. The function fun() gets a character input and the input is terminated by an enter key(New line character). It prints the given character in the reverse order. The given input characters are "abc" Output: cba Learn more problems on : Strings Discuss about this problem : Discuss in Forum

8.	Which of the following statements are correct about the program below? #include int main() { char str[20], *s; printf("Enter a string\n"); scanf("%s", str); s=str; while(*s != '\0') { if(*s >= 97 && *s <= 122) *s = *s-32; s++; } printf("%s",str); return 0; }
	A. The code converts a string in to an integer B. The code converts lower case character to upper case C. The code converts upper case character to lower case D. Error in code Answer: Option B Explanation: This program converts the given string to upper case string. Output: Enter a string: indiabix INDIABIX Learn more problems on : Strings Discuss about this problem : Discuss in Forum

9.	What will be the output of the program ? #include struct course { int courseno; char coursename[25]; }; int main() { struct course c[] = { {102, "Java"}, {103, "PHP"}, {104, "DotNet"} }; printf("%d", c[1].courseno); printf("%s\n", (*(c+2)).coursename); return 0; }
	A. 103 Dotnet B. 102 Java C. 103 PHP D. 104 DotNet Answer: Option A Learn more problems on : Structures, Unions, Enums Discuss about this problem : Discuss in Forum

10.

If the file 'source.txt' contains a line "Be my friend" which of the following will be the output of below program? #include int main() { FILE *fs, *ft; char c[10]; fs = fopen("source.txt", "r"); c = getc(fs); fseek(fs, 0, SEEK_END); fseek(fs, -3L, SEEK_CUR); fgets(c, 5, fs); puts(c); return 0; }

A. friend B. frien C. end D. Error in fseek(); Answer: Option C Explanation: The file source.txt contains "Be my friend". fseek(fs, 0, SEEK_END); moves the file pointer to the end of the file. fseek(fs, -3L, SEEK_CUR); moves the file pointer backward by 3 characters. fgets(c, 5, fs); read the file from the current position of the file pointer. Hence, it contains the last 3 characters of "Be my friend". Therefore, it prints "end". Learn more problems on : Input / Output Discuss about this problem : Discuss in Forum

11.	Point out the error in the program? #include int main() { FILE *fp; fp=fopen("trial", "r"); fseek(fp, 20, SEEK_SET); fclose(fp); return 0; }
	A. Error: unrecognised Keyword SEEK_SET B. Error: fseek() long offset value C. No error D. None of above Answer: Option B Explanation: Instead of 20 use 20L since fseek() need a long offset value. Learn more problems on : Input / Output Discuss about this problem : Discuss in Forum

12.	What will be the output of the program (myprog.c) given below if it is executed from the command line? cmd> myprog one two three /* myprog.c */ #include #include int main(int argc, char **argv) { printf("%s\n", *++argv); return 0; }
	A. myprog B. one C. two D. three Answer: Option B Learn more problems on : Command Line Arguments Discuss about this problem : Discuss in Forum

13.	What will be the output of the program (sample.c) given below if it is executed from the command line? cmd> sample 1 2 3 /* sample.c */ #include int main(int argc, char *argv[]) { int j; j = argv[1] + argv[2] + argv[3]; printf("%d", j); return 0; }
	A. 6 B. sample 6 C. Error D. Garbage value Answer: Option C Learn more problems on : Command Line Arguments Discuss about this problem : Discuss in Forum

14.	What will be the output of the program (sample.c) given below if it is executed from the command line? cmd> sample friday tuesday sunday /* sample.c */ #include int main(int sizeofargv, char *argv[]) { while(sizeofargv) printf("%s", argv[--sizeofargv]); return 0; }
	A. sample friday tuesday sunday B. sample friday tuesday C. sunday tuesday friday sample D. sunday tuesday friday Answer: Option C Learn more problems on : Command Line Arguments Discuss about this problem : Discuss in Forum

15.	Which of the following statements are correct about the program? #include char *fun(unsigned int num, int base); int main() { char *s; s=fun(128, 2); s=fun(128, 16); printf("%s\n",s); return 0; } char *fun(unsigned int num, int base) { static char buff[33]; char *ptr = &buff[sizeof(buff)-1]; *ptr = '\0'; do { *--ptr = "0123456789abcdef"[num %base]; num /=base; }while(num!=0); return ptr; }
	A. It converts a number to a given base. B. It converts a number to its equivalent binary. C. It converts a number to its equivalent hexadecimal. D. It converts a number to its equivalent octal. Answer: Option A Learn more problems on : Bitwise Operators Discuss about this problem : Discuss in Forum

16.

Point out the error in the program. #include #define MAX 128 int main() { char mybuf[] = "India"; char yourbuf[] = "BIX"; char const *ptr = mybuf; *ptr = 'a'; ptr = yourbuf; return 0; }

A. Error: cannot convert ptr const value B. Error: unknown pointer conversion C. No error D. None of above Answer: Option A Explanation: Step 1: char mybuf[] = "India"; The variable mybuff is declared as an array of characters and initialized with string "India". Step 2: char yourbuf[] = "BIX"; The variable yourbuf is declared as an array of characters and initialized with string "BIX". Step 3: char const *ptr = mybuf; Here, ptr is a constant pointer, which points at achar. The value at which ptr it points is a constant; it will be an error to modify the pointed character; There will not be any error to modify the pointer itself. Step 4: *ptr = 'a'; Here, we are changing the value of ptr, this will result in the error "cannot modify a const object". Learn more problems on : Const Discuss about this problem : Discuss in Forum

17.	Declare the following statement? "An array of three pointers to chars".
	A. char *ptr[3](); B. char *ptr[3]; C. char (*ptr[3])(); D. char **ptr[3]; Answer: Option B Learn more problems on : Complicated Declarations Discuss about this problem : Discuss in Forum

18.	What do the following declaration signify? int *f();
	A. f is a pointer variable of function type. B. f is a function returning pointer to an int. C. f is a function pointer. D. f is a simple declaration of pointer variable. Answer: Option B Learn more problems on : Complicated Declarations Discuss about this problem : Discuss in Forum

19.	What will be the output of the program? #include typedef unsigned long int uli; typedef uli u; int main() { uli a; u b = -1; a = -1; printf("%lu, %lu"a, b); return 0; }
	A. 4343445454, 4343445454 B. 4545455434, 4545455434 C. 4294967295, 4294967295 D. Garbage values Answer: Option C Learn more problems on : Complicated Declarations Discuss about this problem : Discuss in Forum

20.	Can you use the fprintf() to display the output on the screen?
	A. Yes B. No Answer: Option A Explanation: Do like this fprintf(stdout, "%s %d %f", str, i, a); Learn more problems on : Library Functions