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int a=97, z=122;
vector<std::string> imageVector;
for (int i=a; i<=z; i++) {
char c = (char)i;
std::string imageName = "26char/";
imageName.append(&c);
imageName.append(".png");
imageVector.push_back(imageName);
}
mageName.append(&c, 1);
const int a=97, z=122;
vector<string> imageVector;
const string fileHead = "26char/";
const string fileSuffix = ".png";
string imageName(fileHead+"a"+fileSuffix);
for (int i=a; i<=z; i++) {
imageName[fileHead.length()] = static_cast<char>(i);
imageVector.push_back( imageName );
}
for(auto el:imageVector)
cout << el << endl;
for (ch i='a'; i<='z'; i++) {
std::string imageName = "26char/";
imageName +=i;
imageName +=".png";
imageVector.push_back(imageName);
//也可以一句
imageVector.push_back((string)"26char/" + i + ".jpg");
}