C-Variable Numbers and Arguments - Practice Questions

Question 1

What is the correct syntax for a function with variable arguments?

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Question 2

What will be the output of the program? #include #include void fun1(char, int, int *, float *, char *); void fun2(char ch, ...); void (*p1)(char, int, int *, float *, char *); void (*p2)(char ch, ...); int main() { char ch='A'; int i=10; float f=3.14; char *p="Hello"; p1=fun1; p2=fun2; (*p1)(ch, i, &i, &f, p); (*p2)(ch, i, &i, &f, p); return 0; } void fun1(char ch, int i, int *pi, float *pf, char *p) { printf("%c %d %d %f %s ", ch, i, *pi, *pf, p); } void fun2(char ch, ...) { int i, *pi; float *pf; char *p; va_list list; printf("%c ", ch); va_start(list, ch); i = va_arg(list, int); printf("%d ", i); pi = va_arg(list, int*); printf("%d ", *pi); pf = va_arg(list, float*); printf("%f ", *pf); p = va_arg(list, char *); printf("%s", p); }

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Question 3

What is a common use case for variable arguments?

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Question 4

In variable argument functions, how does the function know how many arguments were passed?

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Question 5

What is the role of the fixed parameter in variable argument functions?

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Question 6

What is the type of the va_list in most implementations?

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Question 7

What happens if you call va_arg after va_end?

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Question 8

What is the main disadvantage of variable arguments?

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Question 9

What happens if you call va_arg with the wrong type?

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Question 10

Can you pass structures as variable arguments?

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