Compiler gives warning when printing the address of a variable

Question

I made a very simple program to print the address of two variables.

#include

int main()
{
    int a,b;
    printf(\"%u\\n%u\",&a,&b);
            


        

Answer 1

The correct format specifier for printing an address (pointer) is %p and you need to cast the argument to void *.

Hence, the warning is valid and should be there.

But, when I compiled with GCC-5.x, it gave no warnings

In case of gcc, please include -Wall^Note compiler option and try to compile. I believe it will throw the (same) warning we're expecting.

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Note: Actually, -Wformat, which checks for the type of supplied argument to printf() and scanf() family calls. -Wall enables -Wformat.