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- Question
What will be the output of the program?
#include<stdio.h> #include<string.h> int main() { char str1[20] = "Hello", str2[20] = " World"; printf("%s\n", strcpy(str2, strcat(str1, str2))); return 0; }
Options- A. Hello
- B. World
- C. Hello World
- D. WorldHello
- Correct Answer
- Hello World
ExplanationStep 1: char str1[20] = "Hello", str2[20] = " World"; The variable str1 and str2 is declared as an array of characters and initialized with value "Hello" and " World" respectively.Step 2: printf("%s\n", strcpy(str2, strcat(str1, str2)));
=> strcat(str1, str2)) it append the string str2 to str1. The result will be stored in str1. Therefore str1 contains "Hello World".
=> strcpy(str2, "Hello World") it copies the "Hello World" to the variable str2.
Hence it prints "Hello World".
Strings problems
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- 1. What will be the output of the program?
#include<stdio.h> #include<string.h> int main() { static char s[] = "Hello!"; printf("%d\n", *(s+strlen(s))); return 0; }
Options- A. 8
- B. 0
- C. 16
- D. Error Discuss
Correct Answer: 0
- 2. Which of the statements is correct about the program?
#include<stdio.h> int main() { int i=10; int *j=&i; return 0; }
Options- A. j and i are pointers to an int
- B. i is a pointer to an int and stores address of j
- C. j is a pointer to an int and stores address of i
- D. j is a pointer to a pointer to an int and stores address of i Discuss
Correct Answer: j is a pointer to an int and stores address of i
- 3. Which of the following statements correct about k used in the below statement?
char ****k;
Options- A. k is a pointer to a pointer to a pointer to a char
- B. k is a pointer to a pointer to a pointer to a pointer to a char
- C. k is a pointer to a char pointer
- D. k is a pointer to a pointer to a char Discuss
Correct Answer: k is a pointer to a pointer to a pointer to a pointer to a char
- 4. Which of the following statements correctly declare a function that receives a pointer to pointer to a pointer to a float and returns a pointer to a pointer to a pointer to a pointer to a float?
Options- A. float **fun(float***);
- B. float *fun(float**);
- C. float fun(float***);
- D. float ****fun(float***); Discuss
Correct Answer: float ****fun(float***);
- 5. In the following program add a statement in the function fun() such that address of a gets stored in j?
#include<stdio.h> int main() { int *j; void fun(int**); fun(&j); return 0; } void fun(int **k) { int a=10; /* Add a statement here */ }
Options- A. **k=a;
- B. k=&a;
- C. *k=&a
- D. &k=*a Discuss
Correct Answer: *k=&a
- 6. What will be the output of the program?
#include<stdio.h> int main() { char str1[] = "Hello"; char str2[] = "Hello"; if(str1 == str2) printf("Equal\n"); else printf("Unequal\n"); return 0; }
Options- A. Equal
- B. Unequal
- C. Error
- D. None of above Discuss
Correct Answer: Unequal
Explanation:
Step 1: char str1[] = "Hello"; The variable str1 is declared as an array of characters and initialized with a string "Hello".Step 2: char str2[] = "Hello"; The variable str2 is declared as an array of characters and initialized with a string "Hello".
We have use strcmp(s1,s2) function to compare strings.
Step 3: if(str1 == str2) here the address of str1 and str2 are compared. The address of both variable is not same. Hence the if condition is failed.
Step 4: At the else part it prints "Unequal".
- 7. What will be the output of the program?
#include<stdio.h> #include<string.h> int main() { char str[] = "India\0\CURIOUSTAB\0"; printf("%d\n", strlen(str)); return 0; }
Options- A. 10
- B. 6
- C. 5
- D. 11 Discuss
Correct Answer: 5
Explanation:
The function strlen returns the number of characters int the given string.Therefore, strlen(str) becomes strlen("India") contains 5 characters. A string is a collection of characters terminated by '\0'.
The output of the program is "5".
- 8. What will be the output of the program?
#include<stdio.h> #include<string.h> int main() { char str[] = "India\0\CURIOUSTAB\0"; printf("%s\n", str); return 0; }
Options- A. CURIOUSTAB
- B. India
- C. India CURIOUSTAB
- D. India\0CURIOUSTAB Discuss
Correct Answer: India
Explanation:
A string is a collection of characters terminated by '\0'.Step 1: char str[] = "India\0\CURIOUSTAB\0"; The variable str is declared as an array of characters and initialized with value "India"
Step 2: printf("%s\n", str); It prints the value of the str.
The output of the program is "India".
- 9. What will be the output of the program?
#include<stdio.h> #include<string.h> int main() { char str1[5], str2[5]; int i; gets(str1); gets(str2); i = strcmp(str1, str2); printf("%d\n", i); return 0; }
Options- A. Unpredictable integer value
- B. 0
- C. -1
- D. Error Discuss
Correct Answer: Unpredictable integer value
Explanation:
gets() gets collects a string of characters terminated by a new line from the standard input stream stdin.The gets(str1) read the input string from user and store in variable str1.
The gets(str2) read the input string from user and store in variable str2.
The code i = strcmp(str1, str2); The strcmp not only returns -1, 0 and +1, but also other negative or positive values. So the value of i is "unpredictable integer value".
printf("%d\n", i); It prints the value of variable i.
- 10. What will be the output of the program?
#include<stdio.h> int main() { printf("India", "CURIOUSTAB\n"); return 0; }
Options- A. Error
- B. India CURIOUSTAB
- C. India
- D. CURIOUSTAB Discuss
Correct Answer: India
Explanation:
printf("India", "CURIOUSTAB\n"); It prints "India". Because ,(comma) operator has Left to Right associativity. After printing "India", the statement got terminated.
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- 1. What will be the output of the program?