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- Question
Which of the following function is correct that finds the length of a string?
Options- A.
int xstrlen(char *s) { int length=0; while(*s!='\0') { length++; s++; } return (length); } - B.
int xstrlen(char s) { int length=0; while(*s!='\0') length++; s++; return (length); } - C.
int xstrlen(char *s) { int length=0; while(*s!='\0') length++; return (length); } - D.
int xstrlen(char *s) { int length=0; while(*s!='\0') s++; return (length); } - Correct Answer
int xstrlen(char *s) { int length=0; while(*s!='\0') { length++; s++; } return (length); }
ExplanationOption A is the correct function to find the length of given string.Example:
#include<stdio.h> int xstrlen(char *s) { int length=0; while(*s!='\0') { length++; s++; } return (length); } int main() { char d[] = "CuriousTab"; printf("Length = %d\n", xstrlen(d)); return 0; }Output: Length = 8
More questions
- 1. Identify which of the following are declarations
1 : extern int x; 2 : float square ( float x ) { ... } 3 : double pow(double, double);
Options- A. 1
- B. 2
- C. 1 and 3
- D. 3 Discuss
Correct Answer: 1 and 3
Explanation:
extern int x; - is an external variable declaration.
double pow(double, double); - is a function prototype declaration.
Therefore, 1 and 3 are declarations. 2 is definition.- 2. What will be the output of the program?
#include<stdio.h> #include<stdlib.h> union employee { char name[15]; int age; float salary; }; const union employee e1; int main() { strcpy(e1.name, "K"); printf("%s %d %f", e1.name, e1.age, e1.salary); return 0; }
Options- A. Error: RValue required
- B. Error: cannot convert from 'const int *' to 'int *const'
- C. Error: LValue required in strcpy
- D. No error Discuss
Correct Answer: No error
Explanation:
The output will be (in 16-bit platform DOS):
K 75 0.000000- 3. Point out the error in the program in 16-bit platform?
#include<stdio.h> int main() { struct bits { int i:40; }bit; printf("%d\n", sizeof(bit)); return 0; }
Options- A. 4
- B. 2
- C. Error: Bit field too large
- D. Error: Invalid member access in structure Discuss
Correct Answer: Error: Bit field too large
- 4. Point out the error in the following program.
#include<stdio.h> #include<stdarg.h> int main() { void display(int num, ...); display(4, 12.5, 13.5, 14.5, 44.3); return 0; } void display(int num, ...) { float c; int j; va_list ptr; va_start(ptr, num); for(j=1; j<=num; j++) { c = va_arg(ptr, float); printf("%f", c); } }
Options- A. Error: invalid va_list declaration
- B. Error: var c data type mismatch
- C. No error
- D. No error and Nothing will print Discuss
Correct Answer: Error: var c data type mismatch
Explanation:
Use double instead of float in float c;- 5. What will be the output of the program (sample.c) given below if it is executed from the command line (Turbo C in DOS)?
cmd> sample 1 2 3/* sample.c */ #include<stdio.h> int main(int argc, char *argv[]) { int j; j = argv[1] + argv[2] + argv[3]; printf("%d", j); return 0; }
Options- A. 6
- B. sample 6
- C. Error
- D. Garbage value Discuss
Correct Answer: Error
Explanation:
Here argv[1], argv[2] and argv[3] are string type. We have to convert the string to integer type before perform arithmetic operation.Example: j = atoi(argv[1]) + atoi(argv[2]) + atoi(argv[3]);
- 6. va_list is an array that holds information needed by va_arg and va_end
Options- A. True
- B. False Discuss
Correct Answer: True
- 7. A structure can contain similar or dissimilar elements
Options- A. True
- B. False Discuss
Correct Answer: True
- 8. Which of the statements is correct about the program?
#include<stdio.h> int main() { float a=3.14; char *j; j = (char*)&a; printf("%d\n", *j); return 0; }
Options- A. It prints ASCII value of the binary number present in the first byte of a float variable a.
- B. It prints character equivalent of the binary number present in the first byte of a float variable a.
- C. It will print 3
- D. It will print a garbage value Discuss
Correct Answer: It prints ASCII value of the binary number present in the first byte of a float variable a.
- 9. What will be the output of the program?
#include<stdio.h> int main() { int i=4; switch(i) { default: printf("This is default\n"); case 1: printf("This is case 1\n"); break; case 2: printf("This is case 2\n"); break; case 3: printf("This is case 3\n"); } return 0; }
Options- A. This is default
This is case 1 - B. This is case 3
This is default - C. This is case 1
This is case 3 - D. This is default Discuss
Correct Answer: This is default
This is case 1
Explanation:
In the very begining of switch-case statement default statement is encountered. So, it prints "This is default".In default statement there is no break; statement is included. So it prints the case 1 statements. "This is case 1".
Then the break; statement is encountered. Hence the program exits from the switch-case block.
- 10. What will be the output of the program?
#include<stdio.h> int main() { int a = 300, b, c; if(a >= 400) b = 300; c = 200; printf("%d, %d, %d\n", a, b, c); return 0; }
Options- A. 300, 300, 200
- B. Garbage, 300, 200
- C. 300, Garbage, 200
- D. 300, 300, Garbage Discuss
Correct Answer: 300, Garbage, 200
Explanation:
Step 1: int a = 300, b, c; here variable a is initialized to '300', variable b and c are declared, but not initialized.
Step 2: if(a >= 400) means if(300 >= 400). Hence this condition will be failed.
Step 3: c = 200; here variable c is initialized to '200'.
Step 4: printf("%d, %d, %d\n", a, b, c); It prints "300, garbage value, 200". because variable b is not initialized.
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- 1. Identify which of the following are declarations