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1.

The library function used to reverse a string is

Answer» strrev(s) Reverses all characters in s Example: #include <string.h> #include <stdio.h> int main(void) { char *str = "IndiaBIX"; printf("Before strrev(): %s\n", str); strrev(str); printf("After strrev(): %s\n", str); return 0; } Output: Before strrev(): IndiaBIX After strrev(): XIBaidnI
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2.

What will be the output of the program in Turbo C?

Answer» str[6] = "BIX"; - Nonportable pointer conversion.
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3.

If and bytes size, What will be the output of the program ?

Answer» Step 1: char ch = 'A'; The variable ch is declared as an character type and initialized with value 'A'. Step 2: printf("%d, %d, %d", sizeof(ch), sizeof('A'), sizeof(3.14)); The sizeof function returns the size of the given expression. sizeof(ch) becomes sizeof(char). The size of char is 1 byte. sizeof('A') becomes sizeof(65). The size of int is 4 bytes (as mentioned in the question). sizeof(3.14f). The size of float is 4 bytes. Hence the output of the program is 1, 4, 4
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4.

What will be the output of the program (Turbo C in 16 bit platform DOS) ?

Answer» It prints 'IndiaBIX IndiaBIX' in TurboC (in 16 bit platform). It may cause a 'segmentation fault error' in GCC (32 bit platform).
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5.

If the size of pointer is 4 bytes then What will be the output of the program ?

Answer» Step 1: char *str[] = {"Frogs", "Do", "Not", "Die", "They", "Croak!"}; The variable str is declared as an pointer to the array of 6 strings. Step 2: printf("%d, %d", sizeof(str), strlen(str[0])); sizeof(str) denotes 6 * 4 bytes = 24 bytes. Hence it prints '24' strlen(str[0])); becomes strlen(Frogs)). Hence it prints '5'; Hence the output of the program is 24, 5 Hint: If you run the above code in 16 bit platform (Turbo C under DOS) the output will be 12, 5. Because the pointer occupies only 2 bytes. If you run the above code in Linux (32 bit platform), the output will be 24, 5 (because the size of pointer is 4 bytes).
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6.

What will be the output of the program in 16-bit platform (Turbo C under DOS) ?

Answer» Step 1: printf("%d, %d, %d", sizeof(3.0f), sizeof('3'), sizeof(3.0)); The sizeof function returns the size of the given expression. sizeof(3.0f) is a floating point constant. The size of float is 4 bytes sizeof('3') It converts '3' in to ASCII value.. The size of int is 2 bytes sizeof(3.0) is a double constant. The size of double is 8 bytes Hence the output of the program is 4,2,8 Note: The above program may produce different output in other platform due to the platform dependency of C compiler. In Turbo C, 4 2 8. But in GCC, the output will be 4 4 8.
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7.

What will be the output of the program If characters 'a', 'b' and 'c' enter are supplied as input?

Answer» 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
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8.

Is there any difference between the two statements?

Answer» In first statement the character pointer ch stores the address of the string "IndiaBIX".The second statement specifies the space for 7 characters be allocated and that the name of location is ch.
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9.

If the two strings are identical, then function returns

Answer» Declaration: strcmp(const char *s1, const char*s2); The strcmp return an int value that is if s1 < s2 returns a value < 0 if s1 == s2 returns 0 if s1 > s2 returns a value > 0
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10.

How will you print \n on the screen?

Answer» The statement printf("\\n"); prints '\n' on the screen.
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11.

The library function used to find the last occurrence of a character in a string is

Answer» Declaration: char *strrchr(const char *s, int c); It scans a string s in the reverse direction, looking for a specific character c. Example: #include <string.h> #include <stdio.h> int main(void) { char text[] = "I learn through IndiaBIX.com"; char *ptr, c = 'i'; ptr = strrchr(text, c); if (ptr) printf("The position of '%c' is: %d\n", c, ptr-text); else printf("The character was not found\n"); return 0; } Output: The position of 'i' is: 19
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