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- Question
Is it true that too many recursive calls may result into stack overflow?
Options- A. Yes
- B. No
- Correct Answer
- Yes
ExplanationYes, too many recursive calls may result into stack overflow. because when a function is called its return address is stored in stack.After sometime the stack memory will be filled completely. Hence stack overflow error will occur.
More questions
- 1. If the two strings are identical, then strcmp() function returns
Options- A. -1
- B. 1
- C. 0
- D. Yes Discuss
Correct Answer: 0
Explanation:
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
- 2. What will be the output of the program?
#include<stdio.h> #include<string.h> int main() { char dest[] = {97, 97, 0}; char src[] = "aaa"; int i; if((i = memcmp(dest, src, 2))==0) printf("Got it"); else printf("Missed"); return 0; }
Options- A. Missed
- B. Got it
- C. Error in memcmp statement
- D. None of above Discuss
Correct Answer: Got it
Explanation:
memcmp compares the first 2 bytes of the blocks dest and src as unsigned chars. So, the ASCII value of 97 is 'a'.
if((i = memcmp(dest, src, 2))==0) When comparing the array dest and src as unsigned chars, the first 2 bytes are same in both variables.so memcmp returns '0'.
Then, the if(0=0) condition is satisfied. Hence the output is "Got it".- 3. Consider the following program and what will be content of t?
#include<stdio.h> int main() { FILE *fp; int t; fp = fopen("DUMMY.C", "w"); t = fileno(fp); printf("%d\n", t); return 0; }
Options- A. size of "DUMMY.C" file
- B. The handle associated with "DUMMY.C" file
- C. Garbage value
- D. Error in fileno() Discuss
Correct Answer: The handle associated with "DUMMY.C" file
Explanation:
fp = fopen("DUMMY.C", "w"); A file DUMMY.C is opened in write mode and returns the file pointer to fpt = fileno(fp); returns the handle for the fp stream and it stored in the variable t
printf("%d\n", t); It prints the handle number.
- 4. What are the different types of real data type in C?
Options- A. float, double
- B. short int, double, long int
- C. float, double, long double
- D. double, long int, float Discuss
Correct Answer: float, double, long double
Explanation:
The floating point data types are called real data types. Hence float, double, and long double are real data types.- 5. What will be the output of the program (sample.c) given below if it is executed from the command line?
cmd> sample "*.c"/* sample.c */ #include<stdio.h> int main(int argc, int *argv) { int i; for(i=1; i<argc; i++) printf("%s\n", argv[i]); return 0; }
Options- A. *.c
- B. "*.c"
- C. sample *.c
- D. List of all files and folders in the current directory Discuss
Correct Answer: *.c
- 6. In which header file is the NULL macro defined?
Options- A. stdio.h
- B. stddef.h
- C. stdio.h and stddef.h
- D. math.h Discuss
Correct Answer: stdio.h and stddef.h
Explanation:
The macro "NULL" is defined in locale.h, stddef.h, stdio.h, stdlib.h, string.h, time.h, and wchar.h.- 7. Preprocessor directive #ifdef .. #else ... #endif is used for conditional compilation.
Options- A. True
- B. False Discuss
Correct Answer: True
Explanation:
True, these macros are used for conditional operation.- 8. What do the following declaration signify?
void (*cmp)();
Options- A. cmp is a pointer to an void function type.
- B. cmp is a void type pointer function.
- C. cmp is a function that return a void pointer.
- D. cmp is a pointer to a function which returns void . Discuss
Correct Answer: cmp is a pointer to a function which returns void .
- 9. Which of the following function is used to find the first occurrence of a given string in another string?
Options- A. strchr()
- B. strrchr()
- C. strstr()
- D. strnset() Discuss
Correct Answer: strstr()
Explanation:
The function strstr() Finds the first occurrence of a substring in another stringDeclaration: char *strstr(const char *s1, const char *s2);
Return Value:
On success, strstr returns a pointer to the element in s1 where s2 begins (points to s2 in s1).
On error (if s2 does not occur in s1), strstr returns null.Example:
#include <stdio.h> #include <string.h> int main(void) { char *str1 = "CuriousTab", *str2 = "ia", *ptr; ptr = strstr(str1, str2); printf("The substring is: %s\n", ptr); return 0; }Output: The substring is: iaCURIOUSTAB
- 10. On executing the below program what will be the contents of 'target.txt' file if the source file contains a line "To err is human"?
#include<stdio.h> int main() { int i, fss; char ch, source[20] = "source.txt", target[20]="target.txt", t; FILE *fs, *ft; fs = fopen(source, "r"); ft = fopen(target, "w"); while(1) { ch=getc(fs); if(ch==EOF) break; else { fseek(fs, 4L, SEEK_CUR); fputc(ch, ft); } } return 0; }
Options- A. r n
- B. Trh
- C. err
- D. None of above Discuss
Correct Answer: Trh
Explanation:
The file source.txt is opened in read mode and target.txt is opened in write mode. The file source.txt contains "To err is human".Inside the while loop,
ch=getc(fs); The first character('T') of the source.txt is stored in variable ch and it's checked for EOF.
if(ch==EOF) If EOF(End of file) is true, the loop breaks and program execution stops.
If not EOF encountered, fseek(fs, 4L, SEEK_CUR); the file pointer advances 4 character from the current position. Hence the file pointer is in 5th character of file source.txt.
fputc(ch, ft); It writes the character 'T' stored in variable ch to target.txt.
The while loop runs three times and it write the character 1st and 5th and 11th characters ("Trh") in the target.txt file.
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