# 1) length of string

a = "\0foo\0bar\0";
b = strlen(a);

if (b != 9) exit(1);


# 2) string concatenation

a = "\0foo\0";
b = "bar\0";
c = strcat(a,b);

if (c != "\0foo\0bar\0") exit(2);


# 3) leftmost character position

a = "\0foo\0";
b = strchr(a, "o");

if (b != 2) exit(3);


# 4) rightmost character position

a = "\0foo\0";
b = strrchr(a, "o");

if (b != 3) exit(4);


# 5) position of substring

a = "\0foo\0bar\0";
b = strstr(a, "bar");

if (b != 5) exit(5);


# 6) convert to lower case

a = "\0foo\0BAR\0";
b = tolower(a);

if (b != "\0foo\0bar\0") exit(6);


# 7) convert to upper case

a = "\0foo\0BAR\0";
b = toupper(a);

if (b != "\0FOO\0BAR\0") exit(7);


# 8) alphanumeric test

a = "abc123";
b = "12345.";
p = isalnum(a);
q = isalnum(b);

if (!p || q) exit(8);


# 9) alphabetic test

a = "abcdef";
b = "abc6ef";
p = isalpha(a);
q = isalpha(b);

if (!p || q) exit(9);


# 10) control character test

a = "\n\t\n";
b = "\n12\t";
p = iscntrl(a);
q = iscntrl(b);

if (!p || q) exit(10);


# 11) graphical test

a = "abc123";
b = "\n1234";
p = isgraph(a);
q = isgraph(b);

if (!p || q) exit(11);


# 12) lowercase test

a = "abcdef";
b = "abcDEF";
p = islower(a);
q = islower(b);

if (!p || q) exit(12);


# 13) printing character test

a = "abc123";
b = "\n1234";
p = isprint(a);
q = isprint(b);

if (!p || q) exit(13);


# 14) punctuation test

a = ".;!?:.";
b = "abcdef";
p = ispunct(a);
q = ispunct(b);

if (!p || q) exit(14);


# 15) whitespace test

a = "\n\t  ";
b = "  a  b";
p = isspace(a);
q = isspace(b);

if (!p || q) exit(15);


# 16) uppercase test

a = "ABCDEF";
b = "ABC6EF";
p = isupper(a);
q = isupper(b);

if (!p || q) exit(16);


# 17) hexadecimal digit test

a = "abc123";
b = "gh127t";
p = isxdigit(a);
q = isxdigit(b);

if (!p || q) exit(17);


# 18) substring from index

a = "\0foo\0bar\0";
b = substr(a, 5);

if (b != "bar\0") exit(18);


# 19) substring from index with length

a = "\0foo\0bar\0";
b = substr(a, 5, 3);

if (b != "bar") exit(19);


# 20) substring index out of range

a = "foo";
b = substr(a, 10);

if (b != "") exit(20);


# 21) substring length out of range

a = "foobar";
b = substr(a, 3, 200);

if (b != "bar") exit(21);


# 22) left part of string

a = "\0foo\0bar\0";
b = left(a, 4);

if (b != "\0foo") exit(22);


# 23) too large left part

a = "foo";
b = left(a, 10);

if (b != "foo") exit(23);


# 24) right part of string

a = "\0foo\0bar\0";
b = right(a, 4);

if (b != "bar\0") exit(24);


# 25) too large right part

a = "foo";
b = right(a, 20);

if (b != "foo") exit(25);


# 26) ordinal of first character

a = "@foo";
b = ord(a);

if (b != 64) exit(26);


# 27) character from ordinal

a = 64;
b = chr(a);

if (b != "@") exit(27);


# 28) inverse ord and chr

a = "x";
b = chr(ord(a));

if (a != b) exit(28);


# 29) octal string escape format 1

a = "foo\01004bar";
b = ord(substr(a, 3, 1));
c = ord(substr(a, 4, 1));

if (b != 64 || c != ord("4")) exit(29);


# 30) octal string escape format 2

a = "foo\1004bar";
b = ord(substr(a, 3, 1));
c = ord(substr(a, 4, 1));

if (b != 64 || c != ord("4")) exit(30);


# 31) octal string escape format 3

a = "foo\o1004bar";
b = ord(substr(a, 3, 1));
c = ord(substr(a, 4, 1));

if (b != 64 || c != ord("4")) exit(31);


# 32) decimal string escape

a = "foo\d0644bar";
b = ord(substr(a, 3, 1));
c = ord(substr(a, 4, 1));

if (b != 64 || c != ord("4")) exit(32);


# 33) hexadecimal string escape

a = "foo\x404bar";
b = ord(substr(a, 3, 1));
c = ord(substr(a, 4, 1));

if (b != 64 || c != ord("4")) exit(33);


# 34) leading characters from set

a = "foo\0bar\0";
n = strspn(a, "fo\0");

if (n != 4) exit(34);


# 35) leading characters not from set

a = "foo\0bar\0";
n = strcspn(a, "ra\0b");

if (n != 3) exit(35);


# 36) position of first character from set

a = "foo\0bar\0";
n = strpbrk(a, "\0abr");

if (n != 3) exit(36);


# 37) locale-based string compare

a = "aaa";
b = "bbb";
x = strcoll(a, a);
y = strcoll(a, b);
z = strcoll(b, a);

if (x != 0 || y >= 0 || z <= 0) exit(37);


# 38) explode string into array

a = "foo";
b = explode(a);

if ((int) b != 3 || b[0] != "f" || b[1] != "o" || b[2] != "o") exit(38);


# 39) implode array into string

a = mkarray("h", "e", "l", "l", "o");
b = implode(a);

if (b != "hello") exit(39);


# 40) remove leading whitespace

a = " foo ";
b = ltrim(a);

if (b != "foo ") exit(40);


# 41) remove trailing whitespace

a = " foo ";
b = rtrim(a);

if (b != " foo") exit(41);


# 42) remove leading and trailing whitespace

a = " foo ";
b = trim(a);

if (b != "foo") exit(42);


print("42 subtests ");