What do these errors mean in C?

Question

I'm doing a college assignment in C. We have to write a simple programme that just creates different data types (ints, longs, doubles) and prints them out and their size using the sizeof() function. This is the code I have written for the function that creates an int:

void createInt(){
int i = 3;
printf(int i);
printf(sizeof(int i));
}

It's giving the following errors: For "printf(int i);" it's giving: warning C4047: 'function': 'const char *const ' differs in levels of indirection from 'int' For "printf(sizeof(int i));" it's giving: warning C4024: 'printf': different types for formal and actual parameter 1

Any help would be greatly appreciated. I'm completely new to C. Have never used it before. Thanks!

Answer 1

What the error means is that you're passing the wrong type of parameter to the function printf. It was declared to take a const char * as its first parameter. You're passing it an int then a size_t .

When printf takes only one parameter, that parameter must be a string. But if you want to print the content of the integer i use printf("%d", i) or the value of sizeof(i) which is of the type size_t use it like this : printf("%zu%, sizeof(i))

Answer 2

printf needs a string as its first parameter. What you mean to do is

printf("%i\n", i);
printf("%zu\n", sizeof i);