ABC words: Difference between revisions
Added C++ solution
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31 metalwork 32 railway 33 sallow 34 saltwater 35 sandalwood
36 shadflower 37 shallow 38 stalwart 39 tailwind 40 tallow</pre>
=={{header|C++}}==
<lang cpp>#include <cstdlib>
#include <fstream>
#include <iostream>
bool is_abc_word(const std::string& word) {
size_t a = std::string::npos;
size_t b = std::string::npos;
for (size_t pos = 0, n = word.size(); pos < n; ++pos) {
switch (word[pos]) {
case 'a':
// record position of first 'a'
if (a == std::string::npos)
a = pos;
break;
case 'b':
if (b == std::string::npos) {
// fail if we haven't seen 'a' yet
if (a == std::string::npos)
return false;
// record position of first 'b'
b = pos;
}
break;
case 'c':
// succeed iff we've seen 'b' already
return b != std::string::npos;
}
}
return false;
}
int main(int argc, char** argv) {
const char* filename(argc < 2 ? "unixdict.txt" : argv[1]);
std::ifstream in(filename);
if (!in) {
std::cerr << "Cannot open file '" << filename << "'.\n";
return EXIT_FAILURE;
}
std::string word;
int n = 1;
while (getline(in, word)) {
if (is_abc_word(word))
std::cout << n++ << ": " << word << '\n';
}
return EXIT_SUCCESS;
}</lang>
{{out}}
<pre>
1: aback
2: abacus
3: abc
4: abdicate
5: abduct
6: abeyance
7: abject
8: abreact
9: abscess
10: abscissa
11: abscissae
12: absence
13: abstract
14: abstracter
15: abstractor
16: adiabatic
17: aerobacter
18: aerobic
19: albacore
20: alberich
21: albrecht
22: algebraic
23: alphabetic
24: ambiance
25: ambuscade
26: aminobenzoic
27: anaerobic
28: arabic
29: athabascan
30: auerbach
31: diabetic
32: diabolic
33: drawback
34: fabric
35: fabricate
36: flashback
37: halfback
38: iambic
39: lampblack
40: leatherback
41: metabolic
42: nabisco
43: paperback
44: parabolic
45: playback
46: prefabricate
47: quarterback
48: razorback
49: roadblock
50: sabbatical
51: snapback
52: strabismic
53: syllabic
54: tabernacle
55: tablecloth
</pre>
=={{header|FreeBASIC}}==
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