I have to write a code on c++(dev c++ actually) that counts the number of each letter,and give a percentage of using for each letter....But i don't know how put a txt during the execution,because the txt is asked to be more than 1000 words.

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You should start to open and read a text file.Here is a tutorial if you don't know how to do that.

You could use something like this:

std::map<char,int> dict;
int c;
while((c = getchar())!=EOF) dict[c]++;
for(char& p : dict) std::cout << p.first << ": " << p.second << std::endl;
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