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Point out the error in the following program. #include #include 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); } }

Q: Point out the error in the following program. #include #include 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; …

Use double instead of float in float c;

Error: invalid va_list declaration
Error: var c data type mismatch
No error
No error and Nothing will print

Correct Answer: Error: var c data type mismatch

Explanation:

Use double instead of float in float c;

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More Questions from Variable Number of Arguments

Point out the error in the following program. #include #include int main() { void display(char *s, int num1, int num2, ...); display("Hello", 4, 2, 12.5, 13.5, 14.5, 44.0); return 0; } void display(char *s, int num1, int num2, ...) { double c; char s; va_list ptr; va_start(ptr, s); c = va_arg(ptr, double); printf("%f", c); }
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The macro va_start is used to initialise a pointer to the beginning of the list of fixed arguments.
A function that receives variable number of arguments should use va_arg() to extract the last argument from the variable argument list.
va_list is an array that holds information needed by va_arg and va_end
The macro va_arg is used to extract an argument from the variable argument list and advance the pointer to the next argument.
A function that receives variable number of arguments should use va_arg() to extract arguments from the variable argument list.

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