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C Programming - Functions

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Exercise :: Functions - Point Out Errors

1. 

Point out the error in the program 


f(int a, int b)
{
    int a;
    a = 20;
    return a;
}

A. Missing parenthesis in return statement
B. The function should be defined as int f(int a, int b)
C. Redeclaration of a
D. None of above

Answer: Option C

Explanation:

f(int a, int b) The variable a is declared in the function argument statement.

int a; Here again we are declaring the variable a. Hence it shows the error "Redeclaration of a"

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2. 

Point out the error in the program 

#include<stdio.h>
int f(int a)
{
  a > 20? return(10): return(20);
}
int main()
{
    int f(int);
    int b;
    b = f(20);
    printf("%d\n", b);
    return 0;
}
A. Error: Prototype declaration
B. No error
C. Error: return statement cannot be used with conditional operators
D. None of above

Answer: Option C

Explanation:

In a ternary operator, we cannot use the return statement. The ternary operator requires expressions but not code.

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3. 

Point out the error in the program 

#include<stdio.h>

int main()
{
    int a=10;
    void f();
    a = f();
    printf("%d\n", a);
    return 0;
}
void f()
{
    printf("Hi");
}

A. Error: Not allowed assignment
B. Error: Doesn't print anything
C. No error
D. None of above

Answer: Option A

Explanation:

The function void f() is not visible to the compiler while going through main() function. So we have to declare this prototype void f(); before to main() function. This kind of error will not occur in modern compilers.

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