42     static_assert((std::is_same<decltype(atof("")), double>::value), "");  in main()
43     static_assert((std::is_same<decltype(atoi("")), int>::value), "");  in main()
44     static_assert((std::is_same<decltype(atol("")), long>::value), "");  in main()
45     static_assert((std::is_same<decltype(atoll("")), long long>::value), "");  in main()
46     static_assert((std::is_same<decltype(getenv("")), char*>::value), "");  in main()
47     static_assert((std::is_same<decltype(strtod("", endptr)), double>::value), "");  in main()
48     static_assert((std::is_same<decltype(strtof("", endptr)), float>::value), "");  in main()
49     static_assert((std::is_same<decltype(strtold("", endptr)), long double>::value), "");  in main()
50     static_assert((std::is_same<decltype(strtol("", endptr,0)), long>::value), "");  in main()
51     static_assert((std::is_same<decltype(strtoll("", endptr,0)), long long>::value), "");  in main()
52     static_assert((std::is_same<decltype(strtoul("", endptr,0)), unsigned long>::value), "");  in main()
53     static_assert((std::is_same<decltype(strtoull("", endptr,0)), unsigned long long>::value), "");  in main()
54     static_assert((std::is_same<decltype(rand()), int>::value), "");  in main()
55     static_assert((std::is_same<decltype(srand(0)), void>::value), "");  in main()
56     static_assert((std::is_same<decltype(calloc(0,0)), void*>::value), "");  in main()
57     static_assert((std::is_same<decltype(free(0)), void>::value), "");  in main()
58     static_assert((std::is_same<decltype(malloc(0)), void*>::value), "");  in main()
59     static_assert((std::is_same<decltype(realloc(0,0)), void*>::value), "");  in main()
60     static_assert((std::is_same<decltype(abort()), void>::value), "");  in main()
61     static_assert((std::is_same<decltype(atexit(0)), int>::value), "");  in main()
62     static_assert((std::is_same<decltype(exit(0)), void>::value), "");  in main()
63     static_assert((std::is_same<decltype(_Exit(0)), void>::value), "");  in main()
64     static_assert((std::is_same<decltype(getenv("")), char*>::value), "");  in main()
65     static_assert((std::is_same<decltype(system("")), int>::value), "");  in main()
66     static_assert((std::is_same<decltype(bsearch(0,0,0,0,0)), void*>::value), "");  in main()
67     static_assert((std::is_same<decltype(qsort(0,0,0,0)), void>::value), "");  in main()
68     static_assert((std::is_same<decltype(abs(0)), int>::value), "");  in main()
69     static_assert((std::is_same<decltype(labs((long)0)), long>::value), "");  in main()
70     static_assert((std::is_same<decltype(llabs((long long)0)), long long>::value), "");  in main()
71     static_assert((std::is_same<decltype(div(0,0)), div_t>::value), "");  in main()
72     static_assert((std::is_same<decltype(ldiv(0L,0L)), ldiv_t>::value), "");  in main()
73     static_assert((std::is_same<decltype(lldiv(0LL,0LL)), lldiv_t>::value), "");  in main()
74     static_assert((std::is_same<decltype(mblen("",0)), int>::value), "");  in main()
78     static_assert((std::is_same<decltype(mbtowc(pw,"",0)), int>::value), "");  in main()
79     static_assert((std::is_same<decltype(wctomb(pc,L' ')), int>::value), "");  in main()
80     static_assert((std::is_same<decltype(mbstowcs(pw,"",0)), size_t>::value), "");  in main()
81     static_assert((std::is_same<decltype(wcstombs(pc,pwc,0)), size_t>::value), "");  in main()