Does your compiler clean up after you?

cleanmem.c

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

void heapTest() {
  int heapsize = 1024 * 1024; // 1MB
  uint8_t *data = malloc(heapsize);
  for (int i = 0; i < heapsize; i++) {
    if (data[i] != 0) {
      printf("unclean heap\n");
      goto cleanup;
    }
  }
  printf("clean heap\n");
  cleanup: free(data);
}

void stackTest() {
  uint64_t int1;
  uint64_t int2;
  uint64_t int3;
  uint64_t int4;
  if (int1 == 0 && int2 == 0 && int3 == 0 && int4 == 0) {
    printf("clean stack\n");
  } else {
    printf("dirty stack\n");
  }
}

int main(int argc, char** argv) {
  heapTest();
  stackTest();
}