Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > What is the output ?#include <stdio.h>i...
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What is the output ?
#include <stdio.h>
int main()
{
int (*ptr)(int ) = fun;
(*ptr)(3);
return 0;
}
int fun(int n)
{
for(;n > 0; n--)
printf("EduRevQuiz ");
return 0;
}
int main()
{
int (*ptr)(int ) = fun;
(*ptr)(3);
return 0;
}
int fun(int n)
{
for(;n > 0; n--)
printf("EduRevQuiz ");
return 0;
}
- a)EduRevQuiz EduRevQuiz EduRevQuiz
- b)EduRevQuiz EduRevQuiz
- c)Compiler Error
- d)Runtime Error
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
What is the output ?#include <stdio.h>int main(){ int (*ptr)(in...
Understanding the Code
The provided C code snippet attempts to define a function pointer and invoke a function using that pointer. However, there are several issues that lead to a compilation error.
Code Overview
1. Function Definition:
- The function `fun` is defined after the `main` function. In C, functions must be declared or defined before they are used.
2. Function Pointer Declaration:
- The line `int (*ptr)(int ) = fun;` tries to assign the function pointer `ptr` to the function `fun`. Since `fun` is not declared before its usage within `main`, the compiler does not recognize it at that point.
Reasons for Compiler Error
- Function Declaration Missing:
- The compiler requires a declaration of `fun` before it can be referenced in `main`. This is because the C language needs to know the signature of the function being pointed to.
- Incorrect Order of Definitions:
- The function `fun` should either be defined before `main` or should have a forward declaration, like `int fun(int n);`, placed before `main`.
Summary of Output
Due to the missing declaration or incorrect order of function definition, the compiler will throw an error when it reaches the line that tries to call `fun` via the pointer. Therefore, the correct answer to the question is option 'C': Compiler Error.
This highlights the importance of proper function declarations and definitions in C programming.
The provided C code snippet attempts to define a function pointer and invoke a function using that pointer. However, there are several issues that lead to a compilation error.
Code Overview
1. Function Definition:
- The function `fun` is defined after the `main` function. In C, functions must be declared or defined before they are used.
2. Function Pointer Declaration:
- The line `int (*ptr)(int ) = fun;` tries to assign the function pointer `ptr` to the function `fun`. Since `fun` is not declared before its usage within `main`, the compiler does not recognize it at that point.
Reasons for Compiler Error
- Function Declaration Missing:
- The compiler requires a declaration of `fun` before it can be referenced in `main`. This is because the C language needs to know the signature of the function being pointed to.
- Incorrect Order of Definitions:
- The function `fun` should either be defined before `main` or should have a forward declaration, like `int fun(int n);`, placed before `main`.
Summary of Output
Due to the missing declaration or incorrect order of function definition, the compiler will throw an error when it reaches the line that tries to call `fun` via the pointer. Therefore, the correct answer to the question is option 'C': Compiler Error.
This highlights the importance of proper function declarations and definitions in C programming.
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Community Answer
What is the output ?#include <stdio.h>int main(){ int (*ptr)(in...
The only problem with program is fun is not declared/defined before it is assigned to ptr. The following program works fine and prints "EduRevQuiz EduRevQuiz EduRevQuiz "
int fun(int n);
int main()
{
// ptr is a pointer to function fun()
int (*ptr)(int ) = fun;
{
// ptr is a pointer to function fun()
int (*ptr)(int ) = fun;
// fun() called using pointer
(*ptr)(3);
return 0;
}
(*ptr)(3);
return 0;
}
int fun(int n)
{
for(;n > 0; n--)
printf("EduRevQuiz ");
}
{
for(;n > 0; n--)
printf("EduRevQuiz ");
}
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What is the output ?#include <stdio.h>int main(){ int (*ptr)(int ) = fun; (*ptr)(3); return 0;}int fun(int n){ for(;n > 0; n--) printf("EduRevQuiz "); return 0;}a)EduRevQuizEduRevQuizEduRevQuizb)EduRevQuizEduRevQuizc)Compiler Errord)Runtime ErrorCorrect answer is option 'C'. Can you explain this answer?
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