malloc.c

#import <stdio.h>
#import <stdlib.h>

// clang -g -Wall -o malloc malloc.c

int main(void) {
    int *blah = malloc(sizeof(int));
    printf("blah on alloc: %x\n", *blah);

    *blah = 23;
    printf("blah after assignment: %x\n", *blah);

    free(blah);
    blah = malloc(sizeof(int));
    printf("blah after free and malloc: %x\n", *blah);

    return 0;
}


/*

% uname -a
Darwin blah.local 17.7.0 Darwin Kernel Version 17.7.0: Thu Jun 21 22:53:14 PDT 2018; root:xn\
u-4570.71.2~1/RELEASE_X86_64 x86_64

% clang --version
Apple LLVM version 10.0.0 (clang-1000.11.45.5)
Target: x86_64-apple-darwin17.7.0
Thread model: posix
InstalledDir: /Applications/Xcode-10-1.app/Contents/Developer/Toolchains/XcodeDefault.xctool\
chain/usr/bin

% clang -g -Wall -o malloc malloc.c

% ./malloc
blah on alloc: 0
blah after assignment: 17
blah after free and malloc: 17

*/