memcmp的隐式声明在c99中无效

Question

I'm creating a very basic C console application in Xcode 4 and I'm hitting a warning on compile: Implicit declaration of memcmp is invalid in c99 .

My use of the function is as you would expect:

if(memcmp(buf, block, 0x14) != 0)
{
    fclose(fh);
    printf("invalid file: %s\n", argv[argc-1]);
    return 1;
}

How is the use of the function wrong and how can I go about fixing it?

Answer 1

你忘了#include <string.h> ，它包含memcmp的声明。