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void foo(const int * x) {
  if (x != NULL) {
    printf(""Value is %d\n"", *x);
  }
  /* ... */
}

char *strcat_nc(char *s1, char *s2);

char *str1 = "str1""str1";
const char *str2 = "str2""str2";
char str3[9] = "str3""str3";
const char str4[9] = "str4""str4";

strcat_nc(str3, str2);	/* Compiler warns that str2 is const */
strcat_nc(str1, str3);  /* Attempts to overwrite string literal! */
strcat_nc(str4, str3);  /* Compiler warns that str4 is const */

char *strcat(char *s1, const char *s2); 

char *str1 = "str1""str1";
const char *str2 = "str2""str2";
char str3[9] = "str3""str3";
const char str4[9] = "str4""str4";

strcat(str3, str2); 

/* Args reversed to prevent overwriting string literal */ 
strcat(str3, str1);  
strcat(str4, str3);  /* Compiler warns that str4 is const */